| CONTRA COSTA COUNTY, CALIFORNIA | 
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1068 Listings |
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| Page: 1 of 3 | Section: 1-5of 11 | Place Names: | Ac-La | |
| Page: 2 of 3 | Section: 6-9 of 11 | Place Names: | La-Ti | |
| Page: 3 of 3 | Section: 11 of 11 | Place Names: | Ti-Yg | |
| Population: | 948,816 2000 census | |
| Area: | 460,980 Acres | |
| County Seat:* | Martinez 1850 - present | |
| Date: February 18, 1850 | Original county | |
| Mining Districts | ||
| Name | Type | |
| Historical Landmarks | ||
| Number |
Name |
Date |
| 312 | John Muir Home | |
| 356 | Castro Home | |
| 455 | Don Fernando Pacheco Adobe | 1843 |
| 509 | Joaquin Moraga Adobe | 1841 |
| 511 | Vicente Martinez Adobe (1853 called Franklin Canyon Adobe) |
1849 |
| 512 | Alvarado Adobe | 1842 |
| 515 | Don Salvio Adobe | June 24, 1835 |
| 722 | Site of the Murder of Dr. John Marsh | September 24, 1856 |
| 731 | The Old Homestead | 1867 |
| 853 | Captain Pedro Fages Trail 1772 | March 31, 1772 |
| 905 | Mount Diablo | |
| 932 | Mount Diablo Coal Field | 1860 |
| 1002-1 | Site of Giant Powder Company (Point Pinole) | 1892 |
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Census Totals |
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| 1850 | 1860 | 1870 | 1880 |
| 2,786 Lost - reconstructed in 1852 by State |
5,328 | 8,461 | 12,525 |
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Territorial History |
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| 1850 | One of the 27 original counties |
| Territory from Contra Costa to Alameda (1853) | |
| *Originally to be named Mt. Diablo County. |
| The name signifies "opposite coast," because it is situated opposite San Francisco, across the San Francisco Bay. |
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