Solano County, California

Solano County profile, demographic data, and geographic information.

Local Government & Public Administration

Authoritative general-purpose local government units serving this area U.S. Census Bureau GUS (2026) / GMAF

Government Unit	Unit Type	Jurisdiction Role	Contact / Address
COUNTY OF SOLANO GUS Population: 455,101 (2024) ID: 100642	County	Official County Government	Contact: COUNTY ADMINISTRATOR 675 TEXAS ST, STE 6500, FAIRFIELD CA 94533-6342
CITY OF VALLEJO GUS Population: 123,475 (2024) ID: 207608	Municipal	Municipal Government Within County	Contact: MAYOR 555 SANTA CLARA ST, VALLEJO CA 94590-5939
CITY OF FAIRFIELD GUS Population: 122,646 (2024) ID: 100750	Municipal	Municipal Government Within County	Contact: ASSOCIATE PLANNER 1000 WEBSTER ST, FAIRFIELD CA 94533-4883
CITY OF VACAVILLE GUS Population: 103,994 (2024) ID: 161286	Municipal	Municipal Government Within County	Contact: ADMINISTRATIVE ASSISTANT 650 MERCHANT ST, VACAVILLE CA 95688-6992
CITY OF SUISUN CITY GUS Population: 29,614 (2024) ID: 183862	Municipal	Municipal Government Within County	Contact: FINANCIAL SERVICES MANAGER 701 CIVIC CENTER BLVD, SUISUN CITY CA 94585-2695
CITY OF BENICIA GUS Population: 26,477 (2024) ID: 161285	Municipal	Municipal Government Within County	Contact: ECONOMIC DEVELOPMENT MANAGER CITY OF BENICIA, 250 EAST L STREET, BENICIA CA 94510-3285
CITY OF DIXON GUS Population: 20,296 (2024) ID: 123161	Municipal	Municipal Government Within County	Contact: DEPUTY FINANCE DIRECTOR 600 E A ST, DIXON CA 95620-3619
CITY OF RIO VISTA GUS Population: 10,248 (2024) ID: 207607	Municipal	Municipal Government Within County	Contact: CITY MANAGER PO BOX 745, RIO VISTA CA 94571-0745