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California Counties

The U.S. state of California is divided into fifty-eight counties. On January 4, 1850, the California constitutional committee recommended the formation of 18 counties. They were Benicia, Butte, Fremont, Los Angeles, Mariposa, Monterey, Mount Diablo, Oro, Redding, Sacramento, San Diego, San Francisco, San Joaquin, San Jose, San Luis Obispo, Santa Barbara, Sonoma, and Sutter. On April 22, the Counties of Branciforte, Calaveras, Coloma, Colusi, Marin, Mendocino, Napa, Trinity, and Yuba were added. Benicia was renamed Solano, Coloma to El Dorado, Fremont to Yola, Mt. Diablo to Contra Costa, San Jose to Santa Clara, Oro to Tuolumne, and Redding to Shasta. One of the first state legislative acts regarding Counties was to rename Branciforte County to Santa Cruz, Colusi to Colusa, and Yola to Yolo.

The last California county to have been established is Imperial County in 1907.
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Solano County, California

Solano County Education, Geography, and HistorySolano County, Califronia Courthouse

Solano County is a county located in the state of California. As of the 2010 census, the population was 413,344. The county seat is Fairfield, and the largest city is Vallejo.

Solano County comprises the Vallejo-Fairfield, CA Metropolitan Statistical Area, which is also included in the San Jose-San Francisco-Oakland, CA Combined Statistical Area. Solano County is the northeastern county in the nine-county San Francisco Bay Area region.

Etymology - Origin of Solano County Name

The county derives its name indirectly from that of the Franciscan missionary, Father Francisco Solano, whose name was given in baptism to the chief of one of the Indian tribes of the region. Before receiving the name Solano, the chief was called Sem-yeto, which signifies "brave or fierce hand." At the request of General Mariano Vallejo, the county was named for Chief Solano, who at one time ruled over most of the land and tribes between the Petaluma Creek and the Sacramento River.


County QuickFacts: Census Bureau Quick Facts

County History

Solano County was one of the original counties of California, created in 1850 at the time of statehood. Prior to statehood, it had been referred to as Benicia County. The county seat is Fairfield and the largest city is Vallejo.

Perhaps no county in the State has had so momentous a history as Solano, lying as she does in a sense at the portal to the great interior valleys and the mining regions. She has had the vision of great cities and of metropolitan importance. All these things were disappointments, however, and the county has fallen back to not less solid, if less brilliant, advances in the way of fruit culture and the growth of grain, while still her two cities of Vallejo and Benicia keep up the prestige that attaches always to things naval or military.


According to the US Census Bureau, the county has a total area of 907 square miles (2,348 km2), of which, 829 square miles (2,148 km2) of it is land and 77 square miles (201 km2) of it (8.55%) is water.

A portion of the South Campus at the University of California, Davis is in Solano County.

Neighboring Counties:

  • North: Yolo County
  • Northeast: Sacramento County
  • South: Contra Costa County
  • Southwest: San Francisco Bay
  • Northwest: Sonoma County; Napa County


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