Solano County () is a
county
A county () is a geographic region of a country used for administrative or other purposesL. Brookes (ed.) '' Chambers Dictionary''. Edinburgh: Chambers Harrap Publishers Ltd, 2005. in some nations. The term is derived from the Old French denoti ...
located in the
U.S. state
In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its so ...
of
California
California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...
. As of the
2020 census, its population was 453,491. The
county seat
A county seat is an administrative center, seat of government, or capital city of a county or parish (administrative division), civil parish. The term is in use in five countries: Canada, China, Hungary, Romania, and the United States. An equiva ...
is
Fairfield.
Solano County comprises the Vallejo–Fairfield
metropolitan statistical area, which is also included in the
San Jose–
San Francisco
San Francisco, officially the City and County of San Francisco, is a commercial, Financial District, San Francisco, financial, and Culture of San Francisco, cultural center of Northern California. With a population of 827,526 residents as of ...
–
Oakland
Oakland is a city in the East Bay region of the San Francisco Bay Area in the U.S. state of California. It is the county seat and most populous city in Alameda County, with a population of 440,646 in 2020. A major West Coast port, Oakland is ...
,
combined statistical area.
Solano County is the northeastern county in the nine-county
San Francisco Bay Area
The San Francisco Bay Area, commonly known as the Bay Area, is a List of regions of California, region of California surrounding and including San Francisco Bay, and anchored by the cities of Oakland, San Francisco, and San Jose, California, S ...
region.
A portion of the South Campus at the
University of California, Davis
The University of California, Davis (UC Davis, UCD, or Davis) is a Public university, public Land-grant university, land-grant research university in Davis, California, United States. It is the northernmost of the ten campuses of the University ...
, is in Solano County.
History
Solano County was one of the original
counties of California
A county () is a geographic region of a country used for administrative or other purposesL. Brookes (ed.) ''Chambers Dictionary''. Edinburgh: Chambers Harrap Publishers Ltd, 2005. in some nations. The term is derived from the Old French denotin ...
, created in 1850 at the time of statehood.
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 Sacramento River () is the principal river of Northern California in the United States and is the largest river in California. Rising in the Klamath Mountains, the river flows south for before reaching the Sacramento–San Joaquin River D ...
. 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
The Franciscans are a group of related organizations in the Catholic Church, founded or inspired by the Italian saint Francis of Assisi. They include three independent Religious institute, religious orders for men (the Order of Friars Minor bei ...
missionary
A missionary is a member of a Religious denomination, religious group who is sent into an area in order to promote its faith or provide services to people, such as education, literacy, social justice, health care, and economic development.Thoma ...
Father
Francisco Solano. "Solano" is a common surname in the north of Spain, especially in Navarra, Zaragoza, and La Rioja.
Travis Air Force Base
Travis Air Force Base is a United States Air Force base under the operational control of Air Mobility Command (AMC), located three miles (5 Kilometre, km) east of the central business district of the city of Fairfield, California, Fairfield, i ...
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.
Region
Solano County is the easternmost county of the
North Bay.
As such, it is sometimes reported by news agencies as being in the
East Bay
The East Bay is the eastern region of the San Francisco Bay Area and includes cities along the eastern shores of San Francisco Bay and San Pablo Bay. The region has grown to include inland communities in Alameda and Contra Costa counties. Wi ...
. Additionally, a portion of the county extends into the
Sacramento Valley
The Sacramento Valley is the area of the Central Valley of the U.S. state of California that lies north of the Sacramento–San Joaquin River Delta and is drained by the Sacramento River. It encompasses all or parts of ten Northern California ...
, geographically.
Geography
According to the
U.S. Census Bureau, the county has a total area of , of which , comprising 9.3%, are covered by water.
Solano County had several
cinnabar
Cinnabar (; ), or cinnabarite (), also known as ''mercurblende'' is the bright scarlet to brick-red form of Mercury sulfide, mercury(II) sulfide (HgS). It is the most common source ore for refining mercury (element), elemental mercury and is t ...
mines that were worked in the first half of the 20th century, including the
Hastings Mine and
St. John's Mine.
Adjacent counties
*
Contra Costa County, California
Contra Costa County (; ''Contra Costa'', Spanish for 'Opposite Coast') is a county located in the U.S. state of California, in the East Bay of the San Francisco Bay Area. As of the 2020 United States census, the population was 1,165,927. Th ...
- south
*
Sonoma County, California
Sonoma County ( ) is a county located in the U.S. state of California. As of the 2020 United States census, its population was 488,863. Its seat of government and largest city is Santa Rosa.
Sonoma County comprises the Santa Rosa-Petaluma ...
- west
*
Napa County, California
Napa County () is a County (United States), county north of San Pablo Bay located in the Northern California, northern portion of the U.S. state of California. As of the 2020 United States census, the population was 138,019. The county seat i ...
- west
*
Yolo County, California
Yolo County (; Wintuan languages, Wintun: ''Yo-loy''), officially the County of Yolo, is a County (United States), county located in the northern portion of the U.S. state of California. Yolo County was one of the original counties of Californi ...
- north
*
Sacramento County, California
Sacramento County () is a County (United States), county located in the U.S. state of California. As of the 2020 United States census, the population was 1,585,055. Its county seat is Sacramento, California, Sacramento, which has been the List ...
- east
National protected area
*
San Pablo Bay National Wildlife Refuge (part)
Flora and fauna
Solano County has a number of
rare and
endangered species
An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching, inv ...
, including the
delta green ground beetle, the
wildflower
A wildflower (or wild flower) is a flower that grows in the wild, rather than being intentionally seeded or planted. The term implies that the plant is neither a hybrid nor a selected cultivar that is any different from the native plant, eve ...
''
Lasthenia conjugens'', commonly known as Contra Costa goldfields, and the annual plant ''
Legenere limosa'' or false Venus' looking glass.
Transportation
Major highways

*
Interstate 80
Interstate 80 (I-80) is an east–west transcontinental freeway that crosses the United States from San Francisco, California, to Teaneck, New Jersey, in the New York metropolitan area. The highway was designated in 1956 as one of the ori ...
*
Interstate 505
*
Interstate 680
*
Interstate 780
*
State Route 12
*
State Route 29
*
State Route 37
*
State Route 84
*
State Route 113
Public transportation
Solano County is served by several transit agencies:
*
SolTrans, formed as a merger between these two existing transit agencies:
**
Vallejo Transit, which also formerly operated the Baylink Ferry to San Francisco
**
Benicia Breeze
*
San Francisco Bay Ferry, with a terminal in
Vallejo
*
Fairfield and Suisun Transit
*
Vacaville City Coach
*
Rio Vista Delta Breeze
Each agency interconnects with the others, enabling transit trips throughout the county. Service also connects with
BART
Bay Area Rapid Transit (BART) is a rapid transit system serving the San Francisco Bay Area in California. BART serves List of Bay Area Rapid Transit stations, 50 stations along six routes and of track, including eBART, a spur line running t ...
stations in Contra Costa County. Transit links are provided to Napa, Yolo and Sacramento counties as well.
Greyhound
The English Greyhound, or simply the Greyhound, is a dog breed, breed of dog, a sighthound which has been bred for coursing, greyhound racing and hunting. Some are kept as show dogs or pets.
Greyhounds are defined as a tall, muscular, smooth-c ...
and
Amtrak
The National Railroad Passenger Corporation, Trade name, doing business as Amtrak (; ), is the national Passenger train, passenger railroad company of the United States. It operates intercity rail service in 46 of the 48 contiguous United Stat ...
provide long-distance intercity service.
Airports
General aviation airports in Solano County that are open to the public are the
Nut Tree Airport and
Rio Vista Municipal Airport.
Demographics
2020 census
2014
A 2014 analysis by ''
The Atlantic
''The Atlantic'' is an American magazine and multi-platform publisher based in Washington, D.C. It features articles on politics, foreign affairs, business and the economy, culture and the arts, technology, and science.
It was founded in 185 ...
'' found Solano County to be the 5th most racially diverse county in the United States, behind
Aleutians West Census Area and
Aleutians East Borough in Alaska,
Queens County in New York, and
Alameda County in California.
2011
Places by population, race, and income
2010
The
2010 United States census reported that Solano County had a population of 413,344. The
racial makeup of Solano County was 210,751 (51.0%) White, 60,750 (14.7%) African American, 3,212 (0.8%) Native American, 60,473 (14.6%) Asian, 3,564 (0.9%) Pacific Islander, 43,236 (10.5%) from other races, and 31,358 (7.6%) from two or more races. Hispanic or Latino of any race were 99,356 persons (24.0%). At 52,641 Filipinos in the county making up 12% of the population, Solano County has the largest percentage Filipino population of any county in the United States.
2000
At the
2000 census there were 394,542 people, 130,403 households, and 97,411 families in the county. The population density was . There were 134,513 housing units at an average density of . The
racial makeup of the county was 56.4% White, 14.9% Black or African American, 0.8% Native American, 12.8% Asian, 0.8% Pacific Islander, 8.0% from other races, and 6.4% from two or more races. 17.64% of the population were Hispanic or Latino of any race. 8.5% were of
German, 6.4%
Irish and 6.0%
English ancestry according to
Census 2000. 75.7% spoke
English, 12.1%
Spanish and 6.6%
Tagalog as their first language.
Of the 130,403 households 39.9% had children under the age of 18 living with them, 55.7% were married couples living together, 13.8% had a female householder with no husband present, and 25.3% were non-families. 19.6% of households were one person and 6.5% were one person aged 65 or older. The average household size was 2.90 and the average family size was 3.33.
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
The poverty threshold, poverty limit, poverty line, or breadline is the minimum level of income deemed adequate in a particular country. The poverty line is usually calculated by estimating the total cost of one year's worth of necessities for ...
, including 10.3% of those under age 18 and 6.3% of those age 65 or over.
Crime
The following table includes the number of incidents reported and the rate per 1,000 persons for each type of offense (2011).
Cities by population and crime rates
Government and politics
Government
The
Government of Solano County is defined and authorized under the
California Constitution and
law
Law is a set of rules that are created and are enforceable by social or governmental institutions to regulate behavior, with its precise definition a matter of longstanding debate. It has been variously described as a science and as the ar ...
as a
general law county. The County government provides countywide services such as elections and voter registration, law enforcement, jails, vital records, property records, tax collection, public health, and social services. In addition the County serves as the local government for all unincorporated areas.
The County government is composed of the elected five-member
Board of Supervisors, several other elected offices including the
Sheriff-Coroner,
District Attorney
In the United States, a district attorney (DA), county attorney, county prosecutor, state attorney, state's attorney, prosecuting attorney, commonwealth's attorney, or solicitor is the chief prosecutor or chief law enforcement officer represen ...
,
Assessor/Recorder,
Auditor-Controller, and
Treasurer
A treasurer is a person responsible for the financial operations of a government, business, or other organization.
Government
The treasury of a country is the department responsible for the country's economy, finance and revenue. The treasure ...
/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:
* Cassandra James, District 1
* Monica Brown, District 2, Vice Chair
* Wanda Williams, District 3
* John Vasquez, District 4
* Mitch Mashburn, District 5, Chair
Politics
Voter registration statistics
Overview

Solano County has been a Democratic stronghold in
presidential and
congressional elections, with Californians
Richard Nixon
Richard Milhous Nixon (January 9, 1913April 22, 1994) was the 37th president of the United States, serving from 1969 until Resignation of Richard Nixon, his resignation in 1974. A member of the Republican Party (United States), Republican ...
(in 1972) and
Ronald Reagan
Ronald Wilson Reagan (February 6, 1911 – June 5, 2004) was an American politician and actor who served as the 40th president of the United States from 1981 to 1989. He was a member of the Republican Party (United States), Republican Party a ...
(in 1980 and 1984) being the only Republicans to win the county since 1928. However, the northern area of Solano County including Vacaville and Dixon have begun shifting right as evidenced by the 2022 midterms, voters in Congressional District 4 favoring the Republican candidate 50.3% to 49.7%.
Solano County is split between California's
4th,
7th and
8th
Eighth is ordinal form of the number eight.
Eighth may refer to:
* One eighth, , a fraction, one of eight equal parts of a whole
* Eighth note (quaver), a musical note played for half the value of a quarter note (crotchet)
* Octave, an interval b ...
congressional districts, represented by , and respectively.
In the
California State Assembly
The California State Assembly is the lower house of the California State Legislature (the upper house being the California State Senate). The Assembly convenes, along with the State Senate, at the California State Capitol in Sacramento, Califor ...
, Solano County is split between , and . In the
California State Senate
The California State Senate is the upper house of the California State Legislature (the lower house being the California State Assembly). The state senate convenes, along with the state assembly, at the California State Capitol in Sacramento.
...
, 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
Barack Hussein Obama II (born August 4, 1961) is an American politician who was the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the first African American president in American history. O ...
carried the county by a 28.5% margin over
John McCain
John Sidney McCain III (August 29, 1936 – August 25, 2018) was an American statesman and United States Navy, naval officer who represented the Arizona, state of Arizona in United States Congress, Congress for over 35 years, first as ...
, a larger margin than statewide (24%).
According to the
California Secretary of State
The secretary of state of California is the chief clerk of the U.S. state of California, overseeing a department of 500 people. The Secretary of state (U.S. state government), secretary of state is elected for four year terms, like the state's o ...
, 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. 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
The San Francisco Bay Area, commonly known as the Bay Area, is a region of California surrounding and including San Francisco Bay, and anchored by the cities of Oakland, San Francisco, and San Jose. The Association of Bay Area Governments ...
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%).
Communities
Cities
*
Benicia
*
Dixon
*
Fairfield (county seat)
*
Rio Vista
*
Suisun City
*
Vacaville
*
Vallejo
File:People line up at the gate to the Solano County Fair in Vallejo, California.jpg, People line up at the gate to the Solano County Fair in Vallejo, California
File:A building on the Solano County Fairgrounds.jpg, A building on the Solano County Fairgrounds
Census-designated places
*
Allendale
*
Elmira
*
Green Valley
*
Hartley
Other unincorporated communities
*Bahia
*
Batavia
*
Birds Landing
*Bucktown
*
Collinsville
*
Cordelia
*
Denverton
*
Maine Prairie
*
Mankas Corner
*
Rockville
*
Scandia
Population ranking
The population ranking of the following table is based on the
2020 census of Solano County.
† ''county seat''
Miscellania
* In 1985
Humphrey the humpback whale strayed off his migration route and ended up in Shag Slough north of Rio Vista. Rescuers from the Marine Mammal Center and other volunteers dismantled a county bridge before being able to turn him around in the narrow slough.
See also
*
1892 Vacaville–Winters earthquakes
*
List of school districts in Solano County, California
*
National Register of Historic Places listings in Solano County, California
*
Solano County Library
*
Tolenas Springs
Explanatory notes
References
External links
*
* An early history of Solano County.
Hiking trails in Solano County
{{Authority control
Counties in the San Francisco Bay Area
California counties
1850 establishments in California
Populated places established in 1850
Majority-minority counties in California