CONTRA COSTA COUNTY, CALIFORNIA
 

1068 Listings

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

 

 

Census Totals

1850 1860 1870 1880
2,786
Lost - reconstructed in 1852 by State
5,328 8,461 12,525

 

Territorial History

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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