Napa County, California

Napa 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 NAPA GUS Population: 132,727 (2024) ID: 161107	County	Official County Government	Contact: CHAIR 1195 THIRD ST, STE 310, NAPA CA 94559-3035
CITY OF NAPA GUS Population: 76,921 (2024) ID: 123130	Municipal	Municipal Government Within County	Contact: PLANNING DIVISION PO BOX 660, NAPA CA 94559-0660
CITY OF AMERICAN CANYON GUS Population: 21,742 (2024) ID: 161214	Municipal	Municipal Government Within County	Contact: MAYOR 4381 BROADWAY ST, STE 201, AMERICAN CANYON CA 94503-9682
CITY OF ST HELENA GUS Population: 5,257 (2024) ID: 207591	Municipal	Municipal Government Within County	Contact: MAYOR 1480 MAIN ST, SAINT HELENA CA 94574-1899
CITY OF CALISTOGA GUS Population: 5,022 (2024) ID: 161213	Municipal	Municipal Government Within County	1232 WASHINGTON STREET, CALISTOGA CA 94515
TOWN OF YOUNTVILLE GUS Population: 3,280 (2024) ID: 100703	Municipal	Municipal Government Within County	Contact: TOWN MANAGER 6550 YOUNT ST, YOUNTVILLE CA 94599-1271