1850 Counties of  California

County Description Area in sq miles Courts held at Pop in 1850
Butte central part, eastern side of Sacramento river blank Butte 2,016
Calaveras no description blank blank 16,884
Colosi or Colusi not listed   Monroeville  
Contra Costa not listed      
El Dorado no description blank blank 6,842
Los Angelos south eastern boundary, on the Pacific ocean blank Los Angelos 3,530
Marin on the coast, north of San Francisco bay not listed San Rafael 1,036
Mariposa east side of Sierra Nevada Mts, with parallel of 38 for its northern boundary not listed Aqua Fria 8,969
Monterey western part on Pacific ocean blank Monterey 2,728
Napa western part blank Napa 2,116 (in 1852)
Nevada northeastern part, on western slope of Sierra Nevada, center of gold-quartz mining blank Nevada city 21,365
Sacramento central part, Sacramento river on west blank Sacramento 12,589 (in 1852)
San Diego southwest corner, Pacific ocean on west blank San Diego 3,530
San Francisco western boundary, Pacific ocean on west, San Francisco bay on northeast blank San Francisco 36,151
San Joaquin central part, crossed by San Joaquin river blank Stockton 5,929 (in 1852)
San Luis Obispo western boundary, extending from the summit of the coast range of mountains to the Pacific ocean, crossed by Nacimiento & Monterey rivers blank San Luis Obispo 984 (in 1852)
Santa Barbara on southwest boundary, Pacific ocean on west blank Santa Barbara 2,131 (in 1852)
Santa Clara in west part, with San Francisco bay on northwest blank San Jose 6,664 (in 1852)
Santa Cruz no description blank Santa Cruz 1,219 (in 1852)
Shasta in northeast corner, crossed by tributaries of Sacramento river blank Reading's Ranch 4,050
Sierra blank not listed not listed 4,855 (in 1852)
Sisiyou blank not listed not listed 2,242 (in 1852)
Solano in west part, Rio Sacramento river on south & east blank Benicia 2,835 (in 1852)
Sonoma western part, San Pablo bay on south blank Sonoma 2,337 (in 1852)
Sutter in northern part, crossed by Sacramento, American & Feather rivers, Honcut & Bear creeks blank Oro 1,207 (in 1852)
Trinity northwest corner, Pacific ocean western & summit of Coast Range of mountains as its eastern boundaries, crossed by Smith's river blank blank 1,764 (in 1852)
Tulare toward southern part, between Coast Range & Sierra Nevada mountains, crossed by tributaries of San Joaquin river blank blank 8,575 (in 1852)
Tuolumne central part, in valley of San Joaquin, between Coast Range & Sierra Nevada mountains, crossed by San Joaquin river blank Sonora 17,657
Yolo central part, extending from the summit of the Coast Range of mountains to the Sacramento river blank Fremont 1,307 (in 1852)
Yuba northeast part, crossed by Feather, Yuba & American rivers, Honcut & Bear creeks blank Marysville 22,005 (in 1852)

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