Ventura County, California

Ventura 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 VENTURA GUS Population: 835,427 (2024) ID: 161120	County	Official County Government	Contact: ASSISTANT CEO/CHIEF FINANCIAL OFFICE 800 S VICTORIA AVE, STE 1880, VENTURA CA 93009-1880
CITY OF OXNARD GUS Population: 200,616 (2024) ID: 161299	Municipal	Municipal Government Within County	Contact: COMPLIANCE SERVICES MANAGER 300 W 3RD ST, UPPR, OXNARD CA 93030-5729
CITY OF SIMI VALLEY GUS Population: 125,778 (2024) ID: 161302	Municipal	Municipal Government Within County	Contact: ASSISTANT CITY MANAGER 2929 TAPO CANYON RD, SIMI VALLEY CA 93063-2117
CITY OF THOUSAND OAKS GUS Population: 124,229 (2024) ID: 201369	Municipal	Municipal Government Within County	Contact: SENIOR PLANNER 2100 E THOUSAND OAKS BLVD, THOUSAND OAKS CA 91362-2999
CITY OF SAN BUENAVENTURA GUS Population: 109,831 (2024) ID: 161300	Municipal	Municipal Government Within County	Contact: ASSOCIATE PLANNER 501 POLI ST, VENTURA CA 93001-2697
CITY OF CAMARILLO GUS Population: 69,881 (2024) ID: 123166	Municipal	Municipal Government Within County	Contact: EXECUTIVE ASSISTANT 601 CARMEN DR, CAMARILLO CA 93010-6091
CITY OF MOORPARK GUS Population: 35,621 (2024) ID: 193119	Municipal	Municipal Government Within County	Contact: PRINCIPAL PLANNER 799 MOORPARK AVE, MOORPARK CA 93021-1155
CITY OF SANTA PAULA GUS Population: 31,786 (2024) ID: 161301	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 569, SANTA PAULA CA 93061-0569
CITY OF PORT HUENEME GUS Population: 21,325 (2024) ID: 212865	Municipal	Municipal Government Within County	Contact: ADMINISTRATIVE SERV COORD 250 N VENTURA RD, PORT HUENEME CA 93041-3094
CITY OF FILLMORE GUS Population: 17,216 (2024) ID: 183857	Municipal	Municipal Government Within County	Contact: MAYOR 250 CENTRAL AVE, FILLMORE CA 93015-1955
CITY OF OJAI GUS Population: 7,563 (2024) ID: 183858	Municipal	Municipal Government Within County	Contact: CITY MANAGER 401 S VENTURA ST, OJAI CA 93023-3255