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Welcome to Sonoma County ...

Time Zone: Sonoma County lies in the Pacific Time Zone (PST/PDT) and observes daylight saving time.

The community of Santa Rosa is the Seat for Sonoma County.

Sonoma County is one of the original counties of California and was founded in 1850.

From the Census Estimates for 2019, <1> Sonoma had a population of 494,336 people. This is an increase of 1.98% since the last Census (which gave a population of 484,755 people in 2010).

At the time of the 2010 Census, Sonoma represented 1.3% of the total population of California.

Below are some of the communities located in Sonoma County:

  • Cloverdale
    (28 miles [45.1 km] to the northwest)
  • Cotati
    (8 miles [12.9 km] to the southeast)
    • Jump to our Gazetteer entry for Cotati
    • Cotati is located in Sonoma County (CA)
    • Population from the 2020 Census: 7,453 people
    • Jump to TripAdvisor's Tourism page for Cotati <2>
  • Healdsburg
    (13 miles [20.9 km] to the northwest)
  • Petaluma
    (15 miles [24.1 km] to the southeast)
    • Jump to our Gazetteer entry for Petaluma
    • Petaluma is located in Sonoma County (CA)
    • Population from the 2020 Census: 60,632 people
    • Jump to TripAdvisor's Tourism page for Petaluma <2>
  • Rohnert Park
    (7 miles [11.3 km] to the southeast)
  • Santa Rosa
    (2 miles [3.2 km] to the east)
  • Sebastopol
    (3 miles [4.8 km] to the southwest)
  • Sonoma
    (19 miles [30.6 km] to the southeast)
    • Jump to our Gazetteer entry for Sonoma
    • Sonoma is located in Sonoma County (CA)
    • Population from the 2020 Census: 10,973 people
    • Jump to TripAdvisor's Tourism page for Sonoma <2>
  • Windsor
    (7 miles [11.3 km] to the north)
    • Jump to our Gazetteer entry for Windsor
    • Windsor is located in Sonoma County (CA)
    • Population from the 2020 Census: 27,322 people
    • Jump to TripAdvisor's Tourism page for Windsor <2>

Websites of Interest ...

Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2010 Census and the next count will be for the 2020 Census.
<2>While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program.
 

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This page was last modified/updated: 12 Jul 2025