Sonoma County, California

Sonoma 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 SONOMA GUS Population: 485,375 (2024) ID: 161117	County	Official County Government	Contact: ADMINISTRATOR 575 ADMINISTRATION DR, SANTA ROSA CA 95403-2823
CITY OF SANTA ROSA GUS Population: 177,524 (2024) ID: 161287	Municipal	Municipal Government Within County	Contact: PLANNING & ECONOMC DEVELOPMENT 100 SANTA ROSA AVENUE, ROOM 3, SANTA ROSA CA 95404
CITY OF PETALUMA GUS Population: 59,393 (2024) ID: 183853	Municipal	Municipal Government Within County	Contact: MAYOR 11 ENGLISH ST, PETALUMA CA 94952-2610
CITY OF ROHNERT PARK GUS Population: 44,894 (2024) ID: 123162	Municipal	Municipal Government Within County	Contact: CITY MANAGER 130 AVRAM AVE, ROHNERT PARK CA 94928-2486
TOWN OF WINDSOR GUS Population: 25,846 (2024) ID: 161288	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 100, WINDSOR CA 95492-0100
CITY OF HEALDSBURG GUS Population: 11,231 (2024) ID: 203980	Municipal	Municipal Government Within County	Contact: CITY CLERK 401 GROVE ST, HEALDSBURG CA 95448-4723
CITY OF SONOMA GUS Population: 10,606 (2024) ID: 183854	Municipal	Municipal Government Within County	Contact: MAYOR 1 THE PLZ, SONOMA CA 95476-6690
CITY OF CLOVERDALE GUS Population: 8,784 (2024) ID: 183852	Municipal	Municipal Government Within County	Contact: DEPUTY CITY CLERK HR TECH 124 N CLOVERDALE BLVD, CLOVERDALE CA 95425-3396
CITY OF COTATI GUS Population: 7,403 (2024) ID: 100752	Municipal	Municipal Government Within County	Contact: MAYOR 201 W SIERRA AVE, COTATI CA 94931-4217
CITY OF SEBASTOPOL GUS Population: 7,388 (2024) ID: 207609	Municipal	Municipal Government Within County	Contact: CITY MANAGER 7120 BODEGA AVE, SEBASTOPOL CA 95472-3791