Product Code Database
Solano County () is a county located in the U.S. state of California. As of the 2020 census, its population was 453,491. The county seat is Fairfield.
Solano County comprises the Vallejo–Fairfield metropolitan statistical area, which is also included in the San Jose–San Francisco–Oakland, combined statistical area. (2025). 9783540005766, Springer. ISBN 9783540005766 Solano County is the northeastern county in the nine-county San Francisco Bay Area region.
A portion of the South Campus at the University of California, Davis, is in Solano County.
At the request of General Mariano Guadalupe Vallejo, the county was named for Chief Solano of the Suisun people, a Native American tribe of the region and Vallejo's close ally. Chief Solano at one time led the tribes between the Petaluma River and the Sacramento River. The chief was also called Sem-Yeto, which signifies "brave or fierce hand". The chief was given the Spanish name Francisco Solano during baptism at the Catholic Mission, and is named after the Spanish Franciscan missionary Father Francis Solanus.
Travis Air Force Base is located just east of Fairfield. Between 2017 and 2023, California Forever purchased over 50,000 acres of land in the county for an estimated $900 million to develop a new city.
Solano County had several cinnabar mines that were worked in the first half of the 20th century, including the Hastings Mine and St. John's Mine.
Greyhound Lines and Amtrak provide long-distance intercity service.
| + Solano County, California – Racial and ethnic composition !Race / Ethnicity ( NH = Non-Hispanic) !Pop 1980 !Pop 1990 !Pop 2000 !Pop 2010 !style="background-color: #ffffb3;" | Pop 2020 !% 1980 !% 1990 !% 2000 !% 2010 !style="background-color: #ffffb3;" | % 2020 | |||
| White alone (NH) | 163,371 | 207,476 | 194,282 | 168,628 | 34.21% |
| Black or African American alone (NH) | 27,372 | 43,858 | 57,597 | 58,743 | 13.24% |
| Native American or Alaska Native alone (NH) | 1,981 | 2,469 | 2,194 | 1,864 | 0.36% |
| Asian Americans alone (NH) | 17,377 | 40,494 | 49,399 | 59,027 | 15.65% |
| Native Hawaiian or Pacific Islander alone (NH) | x included in the Asian category in the 1980 Census | x included in the Asian category in the 1990 Census | 2,859 | 3,243 | 0.83% |
| Other race alone (NH) | 329 | 607 | 955 | 1,463 | 0.66% |
| Mixed race or Multiracial (NH) | x not an option in the 1980 Census | x not an option in the 1990 Census | 17,658 | 21,020 | 6.80% |
| Hispanic or Latino (any race) | 24,773 | 45,517 | 69,598 | 99,356 | 28.26% |
| Total | 235,203 | 340,421 | 394,542 | 413,344 | 100.00% |
| 14.7% |
| 12.2% |
| 39.4% |
| 2.8% |
| 25.7% |
| 8.0% |
| 12.7% |
| 14.9% |
| 25.6% |
| 21.7% |
| 23.3% |
| $119,063 |
| $102,571 |
| $76,038 |
| $85,650 |
| $75,717 |
| $145,781 |
| $106,786 |
| $68,156 |
| $76,286 |
| $85,790 |
| $72,717 |
| Solano County | 99,356 |
| Benicia | 3,248 |
| Dixon | 7,426 |
| Fairfield | 28,789 |
| Rio Vista | 914 |
| Suisun City | 6,753 |
| Vacaville | 21,121 |
| Vallejo | 26,165 |
| Allendale | 235 |
| Elmira | 47 |
| Green Valley | 121 |
| Hartley | 510 |
| All others not CDPs (combined) | 4,027 |
The age distribution was 28.3% under the age of 18, 9.2% from 18 to 24, 31.3% from 25 to 44, 21.7% from 45 to 64, and 9.5% 65 or older. The median age was 34 years. For every 100 females there were 101.5 males. For every 100 females age 18 and over, there were 100.2 males.
The median household income was $54,099 and the median family income was $60,597. Males had a median income of $41,787 versus $31,916 for females. The per capita income for the county was $21,731. About 6.1% of families and 8.3% of the population were below the poverty line, including 10.3% of those under age 18 and 6.3% of those age 65 or over.
| 14.20 |
| 16.84 |
| 30.97 |
| 19.37 |
| 19.52 |
| 21.62 |
| 49.56 |
The County government is composed of the elected five-member Board of Supervisors, several other elected offices including the Sheriff-Coroner, District Attorney, Assessor/Recorder, Auditor-Controller, and Treasurer/Tax Collector/County Clerk, and numerous county departments and entities under the supervision of the County Administrator. As of March 2023, the members of the Solano County Board of Supervisors were:
| 22.1% |
| 21.4% |
| 22.7% |
| 18.2% |
| 23.2% |
| 22.1% |
| 21.8% |
Solano County is split between California's 4th, 7th and 8th congressional districts, represented by , and respectively.
In the California State Assembly, Solano County is split between , and . In the California State Senate, it is in .
On November 4, 2008, Solano County voted 55.82% in favor of Proposition 8, which amended the California Constitution to ban same-sex marriages. It was the only Bay Area county to approve the initiative. In the 2008 presidential election that day, Barack Obama carried the county by a 28.5% margin over John McCain, a larger margin than statewide (24%).
According to the California Secretary of State, as of February 10, 2019, Solano County has 236,028 registered voters. Of those, 106,452 (45.1%) are registered Democrats, 50,006 (21.2%) are registered Republicans, and 66,558 (28.2%) have declined to state a political party. CA Secretary of State – Report of Registration – February 10, 2019 Democrats hold voter-registration advantages in all incorporated cities and towns in Solano County. However, Republicans lead in registration in the unincorporated communities of the county (40%-35%), making Solano the only county in the Bay Area where Republicans out-number Democrats in unincorporated communities. The Democrats' largest registration advantage in Solano is in the city of Vallejo, wherein there are only 8,242 Republicans (14.6%) out of 56,313 total voters compared to 33,753 Democrats (59.9%) and 12,157 voters who have declined to state a political party (21.6%).
† county seat
| 1 | Vallejo | City | 126,090 |
| 2 | † Fairfield | City | 119,881 |
| 3 | Vacaville | City | 102,386 |
| 4 | Suisun City | City | 29,518 |
| 5 | Benicia | City | 27,131 |
| 6 | Dixon | City | 18,988 |
| 7 | Rio Vista | City | 10,005 |
| 8 | Hartley | CDP | 2,430 |
| 9 | Green Valley | CDP | 1,654 |
| 10 | Allendale | CDP | 1,651 |
| 11 | Elmira | CDP | 193 |
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