Page: 2 of 3
Section: 6 of 11 1068 Listings
Sections: | 6 La-Mi | | 7 Mi-Oy | | 8 Oz-Re | | 9
Re-Sa | | 10 Sa-Ti |
| Feature Name | County | Type | Latitude | Longitude | Alt | USGS 7.5' Map |
| Lafayette Creek | Contra Costa | stream | 375333N | 1220637W | - | Walnut Creek |
| Lafayette Reservoir | Contra Costa | reservoir | 375304N | 1220816W | 456 | Briones Valley |
| Lafayette Ridge | Contra Costa | ridge | 375437N | 1220715W | - | Walnut Creek |
| Laguna De Los Palos Colorados | Contra Costa | civil | 375104N | 1220717W | - | Las Trampas Ridge |
| Lake Alhambra | Contra Costa | reservoir | 380036N | 1214739W | - | Antioch North |
| Lake Anza | Contra Costa | reservoir | 375350N | 1221502W | - | Richmond |
| Lake Cascade | Contra Costa | reservoir | 375330N | 1221113W | - | Briones Valley |
| Lake Orinda 587 Dam | Contra Costa | dam | 375330N | 1221112W | - | Briones Valley |
| Larieu Park | Contra Costa | park | 375357N | 1220238W | - | Walnut Creek |
| Larkey Park | Contra Costa | park | 375522N | 1220428W | - | Walnut Creek |
| Las Juntas | Contra Costa | civil | 375819N | 1220523W | - | Walnut Creek |
| Las Juntas | Contra Costa | pop place | 375555N | 1220312W | 80 | Walnut Creek |
| Las Juntas Park | Contra Costa | park | 375738N | 1220432W | - | Walnut Creek |
| Las Trampas Creek | Contra Costa | stream | 375338N | 1220332W | - | Walnut Creek |
| Las Trampas Peak | Contra Costa | summit | 374959N | 1220346W | 1827 | Las Trampas Ridge |
| Las Trampas Ridge | Contra Costa | ridge | 374844N | 1220125W | 1695 | Las Trampas Ridge |
| Laurel Dell Camp | Contra Costa | locale | 375233N | 1215540W | - | Clayton |
| Lauritzen Yacht Harbor | Contra Costa | harbor | 380105N | 1214448W | - | Jersey Island |
| Lauterwasser Creek | Contra Costa | stream | 375325N | 1221139W | - | Briones Valley |
| Lawlor Ravine | Contra Costa | valley | 380108N | 1215607W | - | Honker Bay |
| Lawson Hill | Contra Costa | summit | 375637N | 1221128W | 1129 | Briones Valley |
| Leisure Landing | Contra Costa | locale | 380213N | 1214022W | - | Jersey Island |
| Leland 31-021 Dam | Contra Costa | dam | 375342N | 1220516W | - | Walnut Creek |
| Leland Reservoir | Contra Costa | reservoir | 375342N | 1220516W | - | Walnut Creek |
| Len Hester Park | Contra Costa | park | 375628N | 1220302W | - | Walnut Creek |
| Liberty School (historical) | Contra Costa | school | 375244N | 1214612W | - | Antioch South |
| Lido Bay | Contra Costa | bay | 375422N | 1213606W | - | Woodward Island |
| Lime Ridge | Contra Costa | ridge | 375636N | 1215952W | - | Clayton |
| Lime Ridge Open Space | Contra Costa | park | 375656N | 1220030W | - | Walnut Creek |
| Lindsay Museum | Contra Costa | building | 375525N | 1220426W | - | Walnut Creek |
| Little Bull Valley | Contra Costa | valley | 380210N | 1221022W | - | Benicia |
| Little Franks Tract | Contra Costa | swamp | 380300N | 1213900W | - | Jersey Island |
| Little Hands Stolport | Contra Costa | airport | 374811N | 1220143W | 1008 | Las Trampas Ridge |
| Little John Cove | Contra Costa | bay | 375455N | 1221213W | - | Briones Valley |
| Little Pine Creek | Contra Costa | stream | 375344N | 1215930W | - | Clayton |
| Live Oak Camp | Contra Costa | locale | 375103N | 1215610W | - | Diablo |
| Live Oak Cemetery | Contra Costa | cemetery | 375657N | 1215821W | - | Clayton |
| Lloyds Holiday Harbor | Contra Costa | harbor | 380107N | 1214517W | - | Antioch North |
| Locust Grove Picnic Area | Contra Costa | locale | 375817N | 1214920W | - | Antioch South |
| Lone Tree Point | Contra Costa | cape | 380213N | 1221623W | - | Mare Island |
| Lone Tree School (historical) | Contra Costa | school | 375743N | 1214458W | 131 | Brentwood |
| Lone Tree Valley | Contra Costa | valley | 375617N | 1214222W | - | Brentwood |
| Long Canyon | Contra Costa | valley | 375315N | 1214857W | - | Antioch South |
| Long Ridge | Contra Costa | ridge | 375313N | 1215738W | - | Clayton |
| Long Valley | Contra Costa | valley | 375444N | 1214908W | - | Antioch South |
| Long Wharf | Contra Costa | locale | 375521N | 1222433W | - | San Quentin |
| Los Alamos Creek | Contra Costa | stream | 374526N | 1214920W | - | Tassajara |
| Los Medanos | Contra Costa | civil | 380031N | 1215131W | - | Antioch North |
| Los Medanos | Contra Costa | pop place | 380044N | 1215101W | 39 | Antioch North |
| Los Meganos | Contra Costa | civil | 375454N | 1214224W | - | Brentwood |
| Louie Francis Park | Contra Costa | park | 380001N | 1221850W | - | Mare Island |
| Lucas Park | Contra Costa | park | 375638N | 1222131W | - | Richmond |
| Lupine Rock Picnic Area | Contra Costa | locale | 375820N | 1214941W | - | Antioch South |
| Lutzon | Contra Costa | pop place | 380052N | 1221501W | 80 | Mare Island |
| Luzon | Contra Costa | pop place | 380052N | 1221501W | 80 | Mare Island |
| M L King Memorial Park | Contra Costa | park | 375534N | 1222125W | - | Richmond |
| Mallard | Contra Costa | locale | 380236N | 1215509W | - | Honker Bay |
| Mallard 1019 Dam | Contra Costa | dam | 380116N | 1220228W | - | Vine Hill |
| Mallard Island | Contra Costa | island | 380231N | 1215503W | - | Honker Bay |
| Mallard Reservoir | Contra Costa | reservoir | 380116N | 1220228W | 34 | Vine Hill |
| Mallard Slough | Contra Costa | gut | 380229N | 1215510W | - | Honker Bay |
| Maloney 31-024 Dam | Contra Costa | dam | 375954N | 1221752W | - | Richmond |
| Maloney Reservoir | Contra Costa | reservoir | 375954N | 1221752W | - | Richmond |
| Malott (Historical) | Contra Costa | pop place | n/a | n/a | - | n/a |
| Maltby | Contra Costa | pop place | 380054N | 1220409W | 5 | Vine Hill |
| Marchetti Park | Contra Costa | park | 380003N | 1215053W | - | Antioch North |
| Marina Bay | Contra Costa | bay | 375428N | 1213615W | - | Woodward Island |
| Marina Park | Contra Costa | park | 380157N | 1215327W | - | Honker Bay |
| Marina Park | Contra Costa | park | 375455N | 1222047W | - | Richmond |
| Marina Park | Contra Costa | park | 380108N | 1214904W | - | Antioch North |
| Markley Canyon | Contra Costa | valley | 375918N | 1215107W | - | Antioch South |
| Marsh Creek | Contra Costa | stream | 380052N | 1214100W | - | Jersey Island |
| Marsh Creek 1007-002 Dam | Contra Costa | dam | 375324N | 1214324W | - | Brentwood |
| Marsh Creek Reservoir | Contra Costa | reservoir | 375325N | 1214328W | 168 | Brentwood |
| Marsh Creek Springs | Contra Costa | pop place | 375334N | 1215110W | 600 | Antioch South |
| Marsh Landing | Contra Costa | locale | 380110N | 1214548W | - | Antioch North |
| Martinez | Contra Costa | pop place | 380110N | 1220759W | 23 | Benicia |
| Martinez Dam | Contra Costa | dam | 380035N | 1220625W | - | Vine Hill |
| Martinez Historical Museum | Contra Costa | building | 380110N | 1220803W | - | Benicia |
| Martinez Municipal Park | Contra Costa | park | 380054N | 1220843W | - | Benicia |
| Martinez Regional Shoreline Park | Contra Costa | park | 380134N | 1220751W | - | Benicia |
| Martinez Reservoir | Contra Costa | reservoir | 380035N | 1220625W | - | Vine Hill |
| Martinez Ridge | Contra Costa | ridge | 375919N | 1220706W | - | Walnut Creek |
| Martinez Waterfront Park | Contra Costa | park | 380119N | 1220759W | - | Benicia |
| Martinez Yacht Harbor | Contra Costa | locale | 380138N | 1220810W | - | Benicia |
| McAvoy | Contra Costa | pop place | 380219N | 1215733W | 16 | Honker Bay |
| McAvoy Boat Harbor | Contra Costa | locale | 380228N | 1215723W | - | Honker Bay |
| McClarren Park | Contra Costa | park | 375542N | 1214152W | - | Brentwood |
| Meadow Homes Park | Contra Costa | park | 375750N | 1220221W | - | Walnut Creek |
| Meadow Park | Contra Costa | park | 380008N | 1221813W | - | Mare Island |
| Meadowbrook Park | Contra Costa | park | 380011N | 1214648W | - | Antioch North |
| Meinert | Contra Costa | pop place | 375639N | 1220135W | 70 | Walnut Creek |
| Memorial Monument | Contra Costa | park | 375636N | 1220338W | - | Walnut Creek |
| Memorial Park | Contra Costa | park | 375928N | 1214843W | - | Antioch South |
| Memorial Park | Contra Costa | park | 375606N | 1222124W | - | Richmond |
| Memory Gardens Cemetery | Contra Costa | cemetery | 380034N | 1220217W | - | Vine Hill |
| Meridian Ridge | Contra Costa | ridge | 375427N | 1215532W | 1289 | Clayton |
| Middle Fork San Joaquin River | Contra Costa | stream | 380400N | 1215100W | - | Antioch North |
| Middle Point | Contra Costa | cape | 380318N | 1215930W | - | Honker Bay |
| Middle Slough | Contra Costa | channel | 380225N | 1215102W | - | Antioch North |
Section: 7 of 11
| Feature Name | County | Type | Latitude | Longitude | Alt | USGS 7.5' Map |
| Mimulus Spring | Contra Costa | spring | 375313N | 1215432W | - | Clayton |
| Mira Vista | Contra Costa | range | 375259N | 1221415W | - | Briones Valley |
| Mira Vista | Contra Costa | pop place | 375558N | 1221803W | - | Richmond |
| Mira Vista Hills Park | Contra Costa | park | 375846N | 1214959W | - | Antioch South |
| Mira Vista Park | Contra Costa | park | 375614N | 1221914W | - | Richmond |
| Mira Vista Park | Contra Costa | park | 375915N | 1214938W | - | Antioch South |
| Mira Vista Station Richmond Post Office (Est. Dec. 30, 1949) | Contra Costa | post office | 375634N | 1221941W | - | Richmond |
| Mitchell Canyon | Contra Costa | valley | 375628N | 1215605W | - | Clayton |
| Mitchell Creek Park | Contra Costa | park | 375514N | 1215622W | - | Clayton |
| Mitchell Rock | Contra Costa | summit | 375444N | 1215623W | 1507 | Clayton |
| Mococo | Contra Costa | pop place | 380132N | 1220654W | 20 | Vine Hill |
| Moleta | Contra Costa | island | 375545N | 1222547W | 172 | San Quentin |
| Monsanto | Contra Costa | pop place | 380134N | 1220316W | 10 | Vine Hill |
| Montalvin Manor | Contra Costa | pop place | 375944N | 1221954W | 35 | Richmond |
| Montalvin Park | Contra Costa | park | 375757N | 1221941W | - | Richmond |
| Montara Bay Park | Contra Costa | park | 380007N | 1221935W | - | Mare Island |
| Mount Del Diablo (historic landmark #905) | Contra Costa | summit | 375254N | 1215446W | 3849 | Clayton |
| Monte Del Diablo | Contra Costa | civil | 375900N | 1220008W | - | Walnut Creek |
| Monte Diablo (historic landmark #905) | Contra Costa | summit | 375254N | 1215446W | 3849 | Clayton |
| Monte Diavolo (historic landmark #905) | Contra Costa | summit | 375254N | 1215446W | 3849 | Clayton |
| Moraga | Contra Costa | pop place | 375006N | 1220743W | 490 | Oakland East |
| Moraga 31-022 Dam | Contra Costa | dam | 375054N | 1220700W | - | Las Trampas Ridge |
| Moraga Commons Park | Contra Costa | park | 375026N | 1220728W | - | Las Trampas Ridge |
| Moraga Post Office (Est. May 5, 1886) | Contra Costa | post office | 375006N | 1220745W | - | Oakland East |
| Moraga Town | Contra Costa | pop place | 375036N | 1220720W | 490 | Las Trampas Ridge |
| Moraga Valley | Contra Costa | valley | 374911N | 1220730W | - | Oakland East |
| Morello School Park | Contra Costa | park | 380005N | 1220554W | - | Vine Hill |
| Morgan Territory | Contra Costa | area | 375206N | 1215116W | - | Tassajara |
| Moses Rock Ridge | Contra Costa | ridge | 375255N | 1215600W | - | Clayton |
| Moses Rock Spring | Contra Costa | spring | 375307N | 1215655W | - | Clayton |
| Mount Diablo (historic landmark #905) | Contra Costa | summit | 375254N | 1215446W | 3849 | Clayton |
| Mount Diablo Coal Field (historic landmark # (historic landmark #932) (1860) | Contra Costa | mine | n/a | n/a | - | n/a |
| Mount Diablo Creek | Contra Costa | stream | 380142N | 1220216W | - | Vine Hill |
| Mount Diablo Mine | Contra Costa | mine | 375406N | 1215239W | - | Clayton |
| Mount Diablo School (historical) | Contra Costa | school | 375628N | 1215613W | - | Clayton |
| Mount Diablo State Park | Contra Costa | park | 375146N | 1215548W | - | Diablo |
| Mount Helen | Contra Costa | summit | 375854N | 1220756W | 660 | Briones Valley |
| Mount King | Contra Costa | summit | 375335N | 1215356W | 3557 | Clayton |
| Mount Wanda | Contra Costa | summit | 375901N | 1220809W | 640 | Briones Valley |
| Mount Zion | Contra Costa | summit | 375526N | 1215708W | 1635 | Clayton |
| Mountain Springs Creek | Contra Costa | stream | 375125N | 1215404W | - | Diablo |
| Mountain View | Contra Costa | pop place | 380032N | 1220659W | - | Vine Hill |
| Mountain ViewDam | Contra Costa | dam | 380035N | 1220625W | - | Vine Hill |
| Mountain View Park | Contra Costa | park | 380008N | 1220650W | - | Vine Hill |
| Mountain ViewReservoir | Contra Costa | reservoir | 380035N | 1220625W | - | Vine Hill |
| Mountaire Park | Contra Costa | park | 375923N | 1214805W | - | Antioch South |
| Muir | Contra Costa | pop place | 375926N | 1220745W | 110 | Briones Valley |
| Muir Camp | Contra Costa | locale | 375232N | 1215511W | - | Clayton |
| Mulholland Hill | Contra Costa | summit | 375137N | 1220847W | 1160 | Oakland East |
| Mulligan Hill | Contra Costa | summit | 375855N | 1215602W | 1438 | Clayton |
| Municipal Pier | Contra Costa | locale | 375427N | 1222304W | - | San Quentin |
| Mustard Hill Picnic Area | Contra Costa | locale | 375817N | 1214924W | - | Antioch South |
| Nancy Boyd Park | Contra Costa | park | 375912N | 1220717W | - | Walnut Creek |
| Neroly | Contra Costa | pop place | 375922N | 1214458W | 75 | Brentwood |
| Nevada Dock | Contra Costa | locale | 380212N | 1221026W | - | Benicia |
| Nevin Park | Contra Costa | park | 375612N | 1222149W | - | Richmond |
| New Bridge Marina | Contra Costa | locale | 380107N | 1214507W | - | Antioch North |
| New Holy Cross Cemetery | Contra Costa | cemetery | 380013N | 1214626W | - | Antioch North |
| New York of the Pacific | Contra Costa | pop place | 380141N | 1215301W | 30 | Honker Bay |
| New York Landing | Contra Costa | locale | 380210N | 1215257W | - | Honker Bay |
| New York Point | Contra Costa | cape | 380229N | 1215304W | - | Honker Bay |
| New York Slough | Contra Costa | channel | 380154N | 1215133W | - | Antioch North |
| Newhall Community Park | Contra Costa | park | 375727N | 1215857W | - | Clayton |
| Newlove | Contra Costa | pop place | 375938N | 1214542W | 70 | Antioch South |
| Nicholl Park | Contra Costa | park | 375559N | 1222018W | - | Richmond |
| Nichols | Contra Costa | pop place | 380229N | 1215913W | 20 | Honker Bay |
| Nickols Knob | Contra Costa | summit | 375514N | 1222252W | 371 | San Quentin |
| Nitro | Contra Costa | pop place | 375926N | 1222122W | 20 | Richmond |
| Nitro | Contra Costa | pop place | 380033N | 1222149W | 20 | Mare Island |
| Nob Hill | Contra Costa | summit | 380023N | 1221814W | 140 | Mare Island |
| North 31-027 Dam | Contra Costa | dam | 375748N | 1221936W | - | Richmond |
| North Peak | Contra Costa | summit | 375335N | 1215356W | 3557 | Clayton |
| North Reservoir | Contra Costa | reservoir | 375823N | 1221938W | - | Richmond |
| North Richmond | Contra Costa | pop place | 375732N | 1222159W | 15 | Richmond |
| Nortonville | Contra Costa | pop place | 375728N | 1215246W | 800 | Clayton |
| Nortonville Pass | Contra Costa | gap | 375723N | 1215224W | 1120 | Antioch South |
| Nustrom Park | Contra Costa | park | 375540N | 1222128W | - | Richmond |
| Nystrom Village (subdivision) | Contra Costa | pop place | 375538N | 1222120W | 14 | Richmond |
| Oak View Memorial Park | Contra Costa | cemetery | 380013N | 1214611W | - | Antioch North |
| Oakley | Contra Costa | pop place | 375951N | 1214241W | 18 | Brentwood |
| Oakley Post Office (Est. Oct. 7, 1898) | Contra Costa | post office | 375945N | 1214225W | - | Brentwood |
| Oakmont Memorial Park | Contra Costa | cemetery | 375653N | 1220605W | - | Walnut Creek |
| Ohlone Park | Contra Costa | park | 380020N | 1221618W | - | Mare Island |
| Ohmer (historical) | Contra Costa | pop place | 380035N | 1220118W | 80 | Vine Hill |
| Oil Canyon | Contra Costa | valley | 375638N | 1215001W | - | Antioch South |
| Oil Creek | Contra Costa | stream | 375638N | 1215004W | - | Antioch South |
| Old New York (Historical) | Contra Costa | pop place | n/a | n/a | - | n/a |
| Old River | Contra Costa | stream | 375229N | 1213436W | - | Clifton Court |
| Oleum | Contra Costa | pop place | 380241N | 1221450W | 260 | Benicia |
| Olivera Park | Contra Costa | park | 375952N | 1220240W | - | Walnut Creek |
| Olofson Ridge | Contra Costa | ridge | 375341N | 1215710W | - | Clayton |
| Orinda | Contra Costa | pop place | 375238N | 1221043W | 500 | Briones Valley |
| Orinda Oaks Park | Contra Costa | park | 375123N | 1220908W | - | Oakland East |
| Orinda Park | Contra Costa | pop place | 375238N | 1221043W | 500 | Briones Valley |
| Orinda Village | Contra Costa | pop place | 375315N | 1221140W | 540 | Briones Valley |
| Orwood | Contra Costa | pop place | 375624N | 1213404W | 7 | Woodward Island |
| Orwood Tract | Contra Costa | civil | 375542N | 1213456W | - | Woodward Island |
| Osage Park | Contra Costa | park | 374810N | 1215843W | - | Diablo |
| Oursan Ridge | Contra Costa | ridge | 375716N | 1221259W | - | Briones Valley |
| Oyster Point | Contra Costa | summit | 374950N | 1215236W | 2106 | Diablo |
Section: 8 of
| Feature Name | County | Type | Latitude | Longitude | Alt | USGS 7.5' Map |
| Ozol | Contra Costa | pop place | 380136N | 1220943W | 20 | Benicia |
| Pacheco | Contra Costa | pop place | 375901N | 1220427W | 20 | Walnut Creek |
| Pacheco Creek | Contra Costa | stream | 380240N | 1220529W | - | Vine Hill |
| Palm Tract | Contra Costa | civil | 375714N | 1213518W | - | Woodward Island |
| Paraffin (Historical) | Alameda | pop place | n/a | n/a | - | n/a |
| Parchester Park | Contra Costa | park | 375858N | 1222108W | - | Richmond |
| Parchester Playfield | Contra Costa | park | 375845N | 1222111W | - | Richmond |
| Paso Nogal Park | Contra Costa | park | 375754N | 1220506W | - | Walnut Creek |
| Paul Park | Contra Costa | park | 375241N | 1221052W | - | Briones Valley |
| Peach Tree Springs | Contra Costa | spring | 375401N | 1215750W | - | Clayton |
| Peachtree Springs | Contra Costa | spring | 375401N | 1215750W | - | Clayton |
| Peacock Creek | Contra Costa | stream | 375635N | 1215602W | - | Clayton |
| Penole | Contra Costa | civil | 375926N | 1221356W | - | Briones Valley |
| Penole | Contra Costa | pop place | 380016N | 1221752W | 21 | Mare Island |
| Penole Point | Contra Costa | cape | 380044N | 1222156W | - | Mare Island |
| Pereira Cove | Contra Costa | bay | 375532N | 1221115W | - | Briones Valley |
| Perkins Canyon | Contra Costa | valley | 375346N | 1215208W | - | Antioch South |
| Peticutry River | Contra Costa | stream | 380400N | 1215100W | - | Antioch North |
| Pine Canyon | Contra Costa | valley | 375356N | 1215951W | - | Clayton |
| Pine Creek | Contra Costa | stream | 375837N | 1220308W | - | Walnut Creek |
| Pine Creek 1007 Dam | Contra Costa | dam | 375318N | 1215924W | - | Clayton |
| Pine Ridge | Contra Costa | ridge | 375203N | 1215822W | - | Diablo |
| Pinehurst (Historical) | Contra Costa | pop place | n/a | n/a | - | n/a |
| Pinewood Park | Contra Costa | park | 375700N | 1220438W | - | Walnut Creek |
| Pinole | Contra Costa | civil | 375926N | 1221356W | - | Briones Valley |
| Pinole | Contra Costa | pop place | 380016N | 1221752W | 21 | Mare Island |
| Pinole Creek | Contra Costa | stream | 380051N | 1221744W | - | Mare Island |
| Pinole Estates (Historical) | Contra Costa | pop place | n/a | n/a | - | n/a |
| Pinole Point | Contra Costa | cape | 380044N | 1222156W | - | Mare Island |
| Pinole Post Office (Est. Aug. 29, 1878) | Contra Costa | post office | 380016N | 1221725W | - | Mare Island |
| Pinole Ridge | Contra Costa | ridge | 375932N | 1221549W | - | Richmond |
| Pinole Shoal | Contra Costa | bar | 380245N | 1221844W | - | Mare Island |
| Pinole Shoal Channel | Contra Costa | channel | 380319N | 1221816W | 30 | Mare Island |
| Pinole Shores Park | Contra Costa | park | 380034N | 1221858W | - | Mare Island |
| Pinole Valley Park | Contra Costa | park | 375844N | 1221604W | - | Richmond |
| Pioneer Camp | Contra Costa | locale | 375218N | 1215520W | - | Diablo |
| Piper Slough | Contra Costa | gut | 380230N | 1213746W | - | Jersey Island |
| Pittsburg | Contra Costa | pop place | 380141N | 1215301W | 30 | Honker Bay |
| Pittsburg Landing | Contra Costa | locale | 380242N | 1215053W | - | Antioch North |
| Pittsburg Marina | Contra Costa | locale | 380223N | 1215306W | - | Honker Bay |
| Pittsburg Point | Contra Costa | cape | 380148N | 1215108W | - | Antioch North |
| Pittsburg Post Office (Est. May 25, 1911) | Contra Costa | post office | 380144N | 1215300W | - | Honker Bay |
| Pittsburgh | Contra Costa | pop place | 380141N | 1215301W | 30 | Honker Bay |
| Plaza Del Hambre | Contra Costa | park | 380242N | 1221114W | - | Benicia |
| Plaza One Park | Contra Costa | park | 375524N | 1221929W | - | Richmond |
| Pleasant Hill | Contra Costa | pop place | 375653N | 1220335W | 60 | Walnut Creek |
| Pleasant Hill Park | Contra Costa | park | 375657N | 1220353W | - | Walnut Creek |
| Pleasant Oaks Park | Contra Costa | park | 375615N | 1220405W | - | Walnut Creek |
| Poinsett Park | Contra Costa | park | 375606N | 1221900W | - | Richmond |
| Point Beenar | Contra Costa | cape | 380151N | 1215011W | - | Antioch North |
| Point Bolitas | Contra Costa | cape | 380207N | 1220703W | - | Vine Hill |
| Point Carquinez | Contra Costa | locale | 380223N | 1221030W | - | Benicia |
| Point Edith | Contra Costa | cape | 380313N | 1220408W | - | Vine Hill |
| Point Edith Crossing Range | Contra Costa | channel | 380334N | 1220400W | - | Vine Hill |
| Point Emmet | Contra Costa | cape | 380223N | 1215245W | - | Honker Bay |
| Point Isabel | Contra Costa | cape | 375350N | 1221924W | - | Richmond |
| Point Isabel Regional Shoreline | Contra Costa | park | 375401N | 1221927W | - | Richmond |
| Point Izabel | Contra Costa | cape | 375350N | 1221924W | - | Richmond |
| Point Molate | Contra Costa | cape | 375648N | 1222515W | - | San Quentin |
| Point Molate Beach | Contra Costa | beach | 375643N | 1222447W | - | San Quentin |
| Point Orient | Contra Costa | cape | 375726N | 1222523W | - | San Quentin |
| Point Picket | Contra Costa | cape | 380303N | 1215655W | - | Honker Bay |
| Point Pinole | Contra Costa | cape | 380044N | 1222156W | - | Mare Island |
| Point Pinole Regional Park | Contra Costa | park | 380020N | 1222141W | - | Mare Island |
| Point Potrero | Contra Costa | cape | 375350N | 1221924W | - | Richmond |
| Point Potrero | Contra Costa | cape | 375415N | 1222155W | - | Richmond |
| Point Richmond | Contra Costa | cape | 375435N | 1222322W | - | San Quentin |
| Point Richmond | Contra Costa | cape | 375522N | 1222323W | - | San Quentin |
| Point Richmond | Contra Costa | pop place | 375527N | 1222317W | 200 | San Quentin |
| Point Richmond Historical Society Museum | Contra Costa | building | 375535N | 1222304W | - | San Quentin |
| Point Richmond Station Richmond Post Office (Est. April 16, 1901) (name changed June 25, 1902) | Contra Costa | post office | 375538N | 1222303W | - | San Quentin |
| Point San Joaquin | Contra Costa | cape | 380336N | 1215115W | - | Antioch North |
| Point San Pablo | Contra Costa | cape | 375755N | 1222539W | - | San Quentin |
| Point San Pablo Yacht Harbor | Contra Costa | bay | 375750N | 1222502W | - | San Quentin |
| Point Stevens | Contra Costa | cape | 375435N | 1222322W | - | San Quentin |
| Port Chicago | Contra Costa | pop place | 380246N | 1220111W | 10 | Vine Hill |
| Port Chicago Reach | Contra Costa | channel | 380331N | 1220012W | - | Vine Hill |
| Port Costa | Contra Costa | pop place | 380247N | 1221056W | 17 | Benicia |
| Port Costa 1580 Dam | Contra Costa | dam | 380236N | 1221118W | - | Benicia |
| Port Costa Post Office (Est. Sept. 15, 1881) | Contra Costa | post office | 380247N | 1221057W | - | Benicia |
| Port Costa School (historical) | Contra Costa | school | 380241N | 1221115W | - | Benicia |
| Potrero Point | Contra Costa | cape | 375350N | 1221924W | - | Richmond |
| Prewett Family Park | Contra Costa | park | 375800N | 1214624W | - | Antioch South |
| Prospectors Gap | Contra Costa | gap | 375312N | 1215433W | - | Clayton |
| Prosserville Park | Contra Costa | park | 380050N | 1214915W | - | Antioch North |
| Puerto Dulce | Contra Costa | bay | 380429N | 1220340W | - | Vine Hill |
| Pullman (Historical) | Contra Costa | pop place | n/a | n/a | - | Richmond |
| Punta De San Pablo | Contra Costa | cape | 375755N | 1222539W | - | San Quentin |
| Queen of Haven Cemetery | Contra Costa | cemetery | 375637N | 1220610W | - | Walnut Creek |
| Queen of Heaven Cemetery | Contra Costa | cemetery | 375641N | 1220621W | - | Walnut Creek |
| Quercus Pass | Contra Costa | gap | 375740N | 1215516W | - | Clayton |
| Quereus Pass | Contra Costa | gap | 375740N | 1215516W | - | Clayton |
| Quimby Island | Contra Costa | island | 380131N | 1213413W | - | Bouldin Island |
| Rain Cloud Park | Contra Costa | park | 375747N | 1221615W | - | Richmond |
| Raliez Valley | Contra Costa | valley | 375431N | 1220559W | - | Walnut Creek |
| Rancho Laguna Park | Contra Costa | park | 374833N | 1220643W | - | Las Trampas Ridge |
| Ransom Point | Contra Costa | summit | 375312N | 1215453W | 3490 | Clayton |
| Red Rock | Contra Costa | island | 375545N | 1222547W | 172 | San Quentin |
| Redwood Creek | Contra Costa | stream | 374729N | 1220747W | - | Oakland East |
| Redwood Peak | Contra Costa | summit | 374905N | 1221030W | 1619 | Oakland East |
Section: 9 of
| Feature Name | County | Type | Latitude | Longitude | Alt | USGS 7.5' Map |
| Redwood Regional Park | Contra Costa | park | 374851N | 1220945W | - | Oakland East |
| Reesley Valley | Contra Costa | valley | 375431N | 1220559W | - | Walnut Creek |
| Refugio Creek | Contra Costa | stream | 380118N | 1221703W | - | Mare Island |
| Refugio Landing | Contra Costa | locale | 380123N | 1221729W | - | Mare Island |
| Refugio Valley | Contra Costa | valley | 380107N | 1221649W | - | Mare Island |
| Refugio Valley Park | Contra Costa | park | 380029N | 1221602W | - | Mare Island |
| Reliez Valley | Contra Costa | valley | 375431N | 1220559W | - | Walnut Creek |
| Rheem | Contra Costa | pop place | 375833N | 1222112W | 15 | Richmond |
| Rheem | Contra Costa | pop place | 375139N | 1220734W | 600 | Oakland East |
| Rheem Valley | Contra Costa | pop place | 375136N | 1220722W | 602 | Las Trampas Ridge |
| Rhine Canyon | Contra Costa | valley | 375132N | 1215336W | - | Diablo |
| Rhode Island | Contra Costa | island | 380002N | 1213424W | - | Bouldin Island |
| Richmond | Contra Costa | pop place | 375609N | 1222048W | 50 | Richmond |
| Richmond Harbor Entrance Channel | Contra Costa | channel | 375427N | 1222356W | - | San Quentin |
| Richmond Inner Harbor | Contra Costa | bay | 375407N | 1222024W | - | Richmond |
| Richmond Marina Bay | Contra Costa | harbor | 375440N | 1222100W | - | Richmond |
| Richmond Museum | Contra Costa | building | 375612N | 1222152W | - | Richmond |
| Richmond Pier | Contra Costa | locale | 375428N | 1222305W | - | San Quentin |
| Richmond Point | Contra Costa | cape | 375435N | 1222322W | - | San Quentin |
| Richmond Post Office (Est. June 29, 1900) | Contra Costa | post office | 375614N | 1222129W | - | Richmond |
| Richmond Station | Contra Costa | building | 375615N | 1222110W | - | Richmond |
| Richmond Yacht Harbor | Contra Costa | harbor | 375527N | 1222220W | - | Richmond |
| Richmond-San Francisco Freight Ferry | Contra Costa | trail | 375338N | 1222439W | - | San Quentin |
| Ricks Memorial Park | Contra Costa | park | 380050N | 1220734W | - | Benicia |
| Riggs Canyon | Contra Costa | valley | 374923N | 1215113W | - | Tassajara |
| Rio De San Francisco | Contra Costa | stream | 380400N | 1215100W | - | Antioch North |
| Rio De San Juan Baptista | Contra Costa | stream | 380400N | 1215100W | - | Antioch North |
| Rio De San Roque | Contra Costa | stream | 380400N | 1215100W | - | Antioch North |
| Rio San Leandro | Contra Costa | stream | 374500N | 1220454W | - | Las Trampas Ridge |
| Rithel Park | Contra Costa | park | 380321N | 1221305W | - | Benicia |
| Rivertown Station Antioch Post Office (Est. 1988) | Contra Costa | post office | 380057N | 1214840W | - | Antioch North |
| Riverview Park | Contra Costa | park | 380227N | 1215318W | - | Honker Bay |
| Rock City | Contra Costa | pop place | 375059N | 1215604W | 1520 | Diablo |
| Rock Slough | Contra Costa | stream | 375832N | 1213447W | - | Woodward Island |
| Rocky Island | Contra Costa | island | 375347N | 1222115W | 159 | Richmond |
| Rocky Ridge | Contra Costa | ridge | 374854N | 1220336W | 2024 | Las Trampas Ridge |
| Rodeo | Contra Costa | pop place | 380159N | 1221557W | 20 | Mare Island |
| Rodeo Creek | Contra Costa | stream | 380221N | 1221559W | - | Mare Island |
| Rodeo Grammar School (historical) | Contra Costa | school | 380153N | 1221608W | - | Mare Island |
| Rodeo Marina | Contra Costa | locale | 380222N | 1221615W | - | Mare Island |
| Rodeo Post Office (Est. April 8. 1892) | Contra Costa | post office | 380151N | 1221554W | - | Mare Island |
| Rolling Hills Memorial Park | Contra Costa | cemetery | 375832N | 1221853W | - | Richmond |
| Rollingwood | Contra Costa | pop place | 375755N | 1221944W | - | Richmond |
| Roosevelt Tract | Contra Costa | civil | 375955N | 1213604W | - | Woodward Island |
| Rose Hill Cemetery | Contra Costa | cemetery | 375728N | 1215212W | 1763 | Antioch South |
| Round Bay | Contra Costa | bay | 375924N | 1222206W | - | Richmond |
| Round Top | Contra Costa | summit | 375100N | 1221128W | - | Oakland East |
| Round Top Regional Park | Contra Costa | park | 375057N | 1221144W | - | Oakland East |
| Round Valley | Contra Costa | basin | 375108N | 1214632W | - | Tassajara |
| Rudgear Park | Contra Costa | park | 375240N | 1220142W | - | Walnut Creek |
| Russellmann Creek | Contra Costa | stream | 375520N | 1215416W | - | Clayton |
| Russellmann Park | Contra Costa | park | 375445N | 1215413W | - | Clayton |
| Rust | Contra Costa | pop place | 375457N | 1221838W | 66 | Richmond |
| Rust Post Office (Est. Feb. 29, 1909) (name changed Aug. 26, 1916) | Contra Costa | post office | 375512N | 1221851W | - | Richmond |
| Sacanap | Contra Costa | pop place | 375336N | 1220430W | 210 | Walnut Creek |
| Sacramento River | Contra Costa | stream | 380400N | 1215100W | - | Antioch North |
| Sacramento River | Contra Costa | bay | 380429N | 1220340W | - | Vine Hill |
| Sacramento-San Joaquin Delta | Contra Costa | area | 380405N | 1215030W | - | Antioch North |
| Sacramento-San Joaquin River Delta | Contra Costa | area | 380405N | 1215030W | - | Antioch North |
| Saint Joseph Cemetery | Contra Costa | cemetery | 375738N | 1221956W | - | Richmond |
| Saint Josephs Cemetery | Contra Costa | cemetery | 375738N | 1221956W | - | Richmond |
| Saint Marys Bay | Contra Costa | bay | 375515N | 1213518W | - | Woodward Island |
| Saint Stephen Cemetery | Contra Costa | cemetery | 375745N | 1220150W | - | Walnut Creek |
| Salfingere Park | Contra Costa | park | 375744N | 1220400W | - | Walnut Creek |
| Salt Creek | Contra Costa | stream | 380142N | 1220216W | - | Vine Hill |
| San Catanio Creek | Contra Costa | stream | 374625N | 1215857W | - | Diablo |
| San Francisco Bay | Contra Costa | bay | 375312N | 1222136W | - | Richmond |
| San Francisco Bay Delta | Contra Costa | area | 380405N | 1215030W | - | Antioch North |
| San Joaquin Harbor | Contra Costa | harbor | 380111N | 1214527W | - | Antioch North |
| San Joaquin River | Contra Costa | stream | 380400N | 1215100W | - | Antioch North |
| San Joaquin River | Contra Costa | bay | 380429N | 1220340W | - | Vine Hill |
| San Joaquin Valley | Contra Costa | valley | 381400N | 1211800W | - | Lodi North |
| San Leandro Stream | Contra Costa | stream | 374500N | 1220454W | - | Las Trampas Ridge |
| San Miguel Park | Contra Costa | park | 375447N | 1220213W | - | Walnut Creek |
| San Pablo | Contra Costa | civil | 375643N | 1221841W | - | Richmond |
| San Pablo | Contra Costa | pop place | 375744N | 1222040W | 50 | Richmond |
| San Pablo 31-006 Dam | Contra Costa | dam | 375636N | 1221538W | - | Richmond |
| San Pablo Bay | Contra Costa | bay | 375924N | 1222206W | - | Richmond |
| San Pablo Clearwell 31-029 Dam | Contra Costa | dam | 375412N | 1221706W | - | Richmond |
| San Pablo Creek | Contra Costa | stream | 375835N | 1222256W | - | San Quentin |
| San Pablo Oil Tank Farm | Contra Costa | oilfield | 375915N | 1222007W | - | Richmond |
| San Pablo Post Office (Est. Nov. 15, 1854) | Contra Costa | post office | 375740N | 1222041W | - | Richmond |
| San Pablo Reservoir | Contra Costa | reservoir | 375636N | 1221538W | 315 | Richmond |
| San Pablo Ridge | Contra Costa | ridge | 375607N | 1221610W | - | Richmond |
| San Pablo Strait | Contra Costa | channel | 375837N | 1222615W | - | San Quentin |
| San Ramon | Contra Costa | civil | 374353N | 1215431W | - | Dublin |
| San Ramon | Contra Costa | civil | 374539N | 1215740W | - | Diablo |
| San Ramon | Contra Costa | civil | 374813N | 1215842W | - | Diablo |
| San Ramon | Contra Costa | pop place | 374648N | 1215837W | 480 | Diablo |
| San Ramon Creek | Contra Costa | stream | 375353N | 1220330W | - | Walnut Creek |
| San Ramon Creek | Contra Costa | stream | 380240N | 1220529W | - | Vine Hill |
| San Ramon Post Office (Est. n/a) | Contra Costa | post office | 374649N | 1215748W | - | Diablo |
| San Ramon Siding | Contra Costa | locale | 374650N | 1215756W | - | Diablo |
| San Ramon Valley | Contra Costa | valley | 374500N | 1215650W | - | Diablo |
| San Ramon Valley Overlook | Contra Costa | locale | 375026N | 1215515W | - | Diablo |
| San Ramon Veteran Civilian Conservation Corps Camp | Contra Costa | locale | 374803N | 1215530W | - | Diablo |
| Sand Bay | Contra Costa | bay | 375415N | 1213623W | - | Woodward Island |
| Sand Creek | Contra Costa | stream | 375617N | 1214222W | - | Brentwood |
| Sand Hill | Contra Costa | pop place | 375825N | 1214140W | 43 | Brentwood |
| Sand Mound Slough | Contra Costa | gut | 380039N | 1213656W | - | Bouldin Island |
Section: 10 of
| Feature Name | County | Type | Latitude | Longitude | Alt | USGS 7.5' Map |
| Sando (Historical) | Contra Costa | pop place | n/a | n/a | - | n/a |
| Sandpiper Spit | Contra Costa | bar | 375427N | 1222239W | - | San Quentin |
| Santa Clara Shoal | Contra Costa | bar | 380523N | 1213844W | - | Jersey Island |
| Santa Fe Channel | Contra Costa | channel | 375515N | 1222210W | - | Richmond |
| Saranap | Contra Costa | pop place | 375306N | 1220430W | 420 | Walnut Creek |
| Savage Avenue Park | Contra Costa | park | 375901N | 1221622W | - | Richmond |
| Scow Canyon | Contra Costa | valley | 375621N | 1221452W | - | Briones Valley |
| Seal Bluff Landing | Contra Costa | locale | 380321N | 1220218W | - | Vine Hill |
| Seal Creek | Contra Costa | stream | 380213N | 1220255W | - | Vine Hill |
| Seal Island Channel | Contra Costa | channel | 380318N | 1220237W | - | Vine Hill |
| Seal Islands | Contra Costa | island | 380320N | 1220246W | - | Vine Hill |
| Selby | Contra Costa | pop place | 380324N | 1221434W | 20 | Benicia |
| Selby Reservoir | Contra Costa | reservoir | 380251N | 1221427W | - | Benicia |
| Selby School (historical) | Contra Costa | school | 380256N | 1221451W | - | Benicia |
| Sequoya | Contra Costa | pop place | 374954N | 1221112W | 622 | Oakland East |
| Serpent Slough | Contra Costa | gut | 380355N | 1213820W | - | Jersey Island |
| Serpents Slough | Contra Costa | gut | 380355N | 1213820W | - | Jersey Island |
| Serrito de San Antonio (Historical) | Contra Costa | n/a | n/a | n/a | - | n/a |
| Shadelands Ranch Historical Museum | Contra Costa | building | 375533N | 1220110W | - | Walnut Creek |
| Shadowood Park | Contra Costa | park | 375848N | 1220405W | - | Walnut Creek |
| Sheep Island | Contra Costa | island | 375347N | 1222115W | 159 | Richmond |
| Sheep Slough | Contra Costa | gut | 380114N | 1213446W | - | Bouldin Island |
| Shell Point | Contra Costa | n/a | n/a | n/a | - | n/a |
| Shell Ridge | Contra Costa | ridge | 375346N | 1220050W | - | Walnut Creek |
| Shell Ridge Open Space | Contra Costa | park | 375350N | 1220058W | - | Walnut Creek |
| Sherburn Hills | Contra Costa | range | 374751N | 1215651W | - | Diablo |
| Sherburne Hills | Contra Costa | range | 374751N | 1215651W | - | Diablo |
| Shields-Reid Park | Contra Costa | park | 375715N | 1222144W | - | Richmond |
| Shima-Shima Landing | Contra Costa | locale | 380240N | 1213927W | - | Jersey Island |
| Shimada Friendship Park | Contra Costa | park | 375430N | 1222037W | - | Richmond |
| Shoal Point | Contra Costa | cape | 375415N | 1222155W | - | Richmond |
| Shore Acres | Contra Costa | pop place | 380209N | 1215752W | 30 | Honker Bay |
| Short Ridge | Contra Costa | ridge | 374923N | 1215757W | - | Diablo |
| Short Slough | Contra Costa | gut | 380346N | 1213726W | - | Bouldin Island |
| Short Slough (historical) | Contra Costa | swamp | 380330N | 1213740W | - | Jersey Island |
| Sidney Flat | Contra Costa | flat | 375818N | 1215142W | - | Antioch South |
| Sierra De Los Bolbones (historic landmark #905) | Contra Costa | summit | 375254N | 1215446W | 3849 | Clayton |
| Siesta Valley | Contra Costa | valley | 375205N | 1221200W | - | Oakland East |
| Sindicich Lagoons | Contra Costa | lake | 375643N | 1220827W | - | Briones Valley |
| Site of the Murder of Dr. John Marsh (historic landmark #722) (Sept. 24, 1856) | Contra Costa | locale | n/a | n/a | - | n/a |
| Site of Giant Powder Company (Point Pinole) (historic landmark #1002-1) (1892) | Contra Costa | locale | n/a | n/a | - | n/a |
| Sixth Street Park | Contra Costa | park | 380050N | 1214915W | - | Antioch North |
| Sleepy Hollow | Contra Costa | valley | 375325N | 1221139W | - | Briones Valley |
| Small World Park | Contra Costa | park | 380033N | 1215305W | - | Honker Bay |
| Smiths Landing | Contra Costa | pop place | 380018N | 1214817W | 40 | Antioch North |
| Sobrante | Contra Costa | pop place | 380008N | 1222054W | 20 | Mare Island |
| Sobrante Clearwell 31-023 Dam | Contra Costa | dam | 375754N | 1221648W | - | Richmond |
| Sobrante Reservoir | Contra Costa | reservoir | 375902N | 1221730W | - | Richmond |
| Sobrante Ridge | Contra Costa | ridge | 375730N | 1221517W | - | Richmond |
| Sobrante Ridge Regional Preserve | Contra Costa | park | 375754N | 1221549W | - | Richmond |
| Somersville | Contra Costa | pop place | 375725N | 1215148W | 900 | Antioch South |
| Sommerville | Contra Costa | pop place | 375725N | 1215148W | 900 | Antioch South |
| South San Ramon Creek | Contra Costa | stream | 374556N | 1215716W | - | Diablo |
| Sparkle | Contra Costa | pop place | 375542N | 1220320W | 85 | Walnut Creek |
| Stake Point | Contra Costa | cape | 380303N | 1215655W | - | Honker Bay |
| Star Mine | Contra Costa | mine | 375642N | 1214920W | - | Antioch South |
| Station A Richmond Post Office (Est. Jan. 25, 1945) | Contra Costa | post office | 375557N | 1222045W | - | Richmond |
| Stege | Contra Costa | pop place | 375500N | 1221934W | 20 | Richmond |
| Stewart Draw Park | Contra Costa | park | 375929N | 1221728W | - | Richmond |
| Stewartville | Contra Costa | pop place | 375647N | 1215051W | 600 | Antioch South |
| Stone House | Contra Costa | locale | 375331N | 1214319W | - | Brentwood |
| Stone Valley | Contra Costa | valley | 375122N | 1220133W | - | Las Trampas Ridge |
| Stoneman Park | Contra Costa | park | 380032N | 1215458W | - | Honker Bay |
| Sugarloaf Hill | Contra Costa | summit | 375238N | 1220229W | 487 | Walnut Creek |
| Sugarloaf Open Space | Contra Costa | park | 375216N | 1220213W | - | Las Trampas Ridge |
| Suisun Bay | Contra Costa | bay | 380429N | 1220340W | - | Vine Hill |
| Suisun Point | Contra Costa | cape | 380207N | 1220703W | - | Vine Hill |
| Sulfur Spring | Contra Costa | spring | 375311N | 1215923W | - | Clayton |
| Summerville | Contra Costa | pop place | 375725N | 1215148W | 900 | Antioch South |
| Summit Pass | Contra Costa | gap | 375206N | 1221300W | - | Oakland East |
| Summit Reservoir | Contra Costa | reservoir | 375420N | 1221612W | - | Richmond |
| Sun Terrace Park | Contra Costa | park | 380013N | 1220201W | - | Vine Hill |
| Sunny Acres Trailer Park | Contra Costa | pop place | 375743N | 1220138W | 80 | Walnut Creek |
| Sunny Glen Recreational Area | Contra Costa | park | 374341N | 1215520W | - | Dublin |
| Sunny Ridge Park | Contra Costa | park | 375852N | 1214840W | - | Antioch South |
| Sunset Park | Contra Costa | park | 375720N | 1214105W | - | Brentwood |
| Sunset View Cemetery | Contra Costa | cemetery | 375429N | 1221711W | - | Richmond |
| Sunshine Camp | Contra Costa | locale | 375359N | 1215150W | - | Antioch South |
| Susana Park | Contra Costa | park | 380052N | 1220757W | - | Benicia |
| Sycamore Creek | Contra Costa | stream | 374842N | 1215901W | - | Diablo |
| Sycamore Creek | Contra Costa | stream | 375310N | 1214841W | - | Antioch South |
| Sycamore Spring | Contra Costa | spring | 375134N | 1214853W | - | Tassajara |
| Sycamore Spring | Contra Costa | spring | 375315N | 1215404W | - | Clayton |
| Sycamore Valley | Contra Costa | valley | 374842N | 1215901W | - | Diablo |
| Sycamore Valley Park | Contra Costa | park | 374830N | 1215640W | - | Diablo |
| Tammukan (historical) | Contra Costa | pop place | n/a | n/a | - | n/a |
| Tara Hills | Contra Costa | pop place | 375937N | 1221855W | 90 | Richmond |
| Tassajara | Contra Costa | pop place | 374745N | 1215145W | 713 | Tassajara |
| Tassajara Creek | Contra Costa | stream | 375105N | 1215213W | - | Tassajara |
| Tassajara Park | Contra Costa | park | 375607N | 1221834W | - | Richmond |
| Tassajera Creek | Contra Costa | stream | 375105N | 1215213W | - | Tassajara |
| Tassajero | Contra Costa | pop place | 374745N | 1215145W | 713 | Tassajara |
| Tassajero Creek | Contra Costa | stream | 375105N | 1215213W | - | Tassajara |
| Taylor Slough | Contra Costa | gut | 380146N | 1214000W | - | Jersey Island |
| Telegraph Canyon | Contra Costa | valley | 375234N | 1221311W | - | Briones Valley |
| Tenderfoot Flat | Contra Costa | flat | 375334N | 1215721W | - | Clayton |
| The Brothers | Contra Costa | island | 375748N | 1222555W | - | San Quentin |
| The Knife | Contra Costa | ridge | 374433N | 1220020W | - | Hayward |
| The Old Homestead (historic landmark #731) (1867) | Contra Costa | building | n/a | n/a | - | n/a |
| Tice Creek | Contra Costa | stream | 375211N | 1220545W | - | Las Trampas Ridge |
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