Sonoma County, CA ZIP Codes & Directory
Complete postal guide for Sonoma County, California. Featuring the official county seat of Santa Rosa, largest municipality Santa Rosa, and serving 24 incorporated municipal entities.
Municipalities Located in Sonoma County
Incorporated Cities, Towns, and Villages
Annapolis
cityZIPs: 95412
Bodega
cityZIPs: 94922
Bodega Bay
cityZIPs: 94923
Cazadero
cityZIPs: 95421
Cloverdale
cityZIPs: 95425
Cotati
cityZIPs: 94931
Forestville
cityZIPs: 95436
Fulton
cityZIPs: 95439
Geyserville
cityZIPs: 95441
Glen Ellen
cityZIPs: 95442
Graton
cityZIPs: 95444
Guerneville
cityZIPs: 95446
Healdsburg
cityZIPs: 95448
Jenner
cityZIPs: 95450
Kenwood
cityZIPs: 95452
Monte Rio
cityZIPs: 95462
Occidental
cityZIPs: 95465
Penngrove
cityZIPs: 94951
Petaluma
cityZIPs: 94952, 94954 , +1 more
Rohnert Park
cityZIPs: 94928
Santa Rosa
cityZIPs: 95401, 95403 , +4 more
Sebastopol
cityZIPs: 95472
Sonoma
cityZIPs: 95476
Windsor
cityZIPs: 95492
Active USPS ZIP Codes in Sonoma County
Standard delivery zones and geographic service boundaries
Frequently Asked Questions About Sonoma County, CA
What is the county seat and largest city in Sonoma County? ▾
The official county seat of Sonoma County is Santa Rosa, and its largest incorporated municipality by population is Santa Rosa.
How many cities, towns, and villages are in Sonoma County? ▾
Sonoma County encompasses 24 incorporated municipal entities, including 24 cities, 0 towns, and 0 villages.
What is the total population and land area of Sonoma County? ▾
According to official U.S. Census Bureau data, Sonoma County has a population of approximately 488,863 residents and spans an area of 1,575 square miles.
How many ZIP codes operate in Sonoma County? ▾
There are 31 active USPS ZIP codes serving addresses within Sonoma County, California.