As of October 12, 2026, ListRiver's records show 36,283 active registered businesses in Sonoma County, California, the 16th most among California counties. 56% are LLCs. 10 were formed in September 2026. That is 1% of all California businesses on record.
How many businesses are registered in Sonoma County, California?
ListRiver has 36,283 active registered businesses in Sonoma County, California on record as of October 12, 2026, from official California business registry data. Dissolved and defunct businesses are not counted.
How many new businesses were formed in Sonoma County, California in September 2026?
10 businesses on record in Sonoma County, California were formed in September 2026.
How many new businesses opened in Sonoma County, California in the last 12 months?
2,630 businesses on record in Sonoma County, California were formed in the 12 months through September 2026.
What is the most common type of business in Sonoma County, California?
LLCs are the most common: 20,443 of 36,283 businesses on record (56%), followed by Corporations with 9,960 (27%).
Where does this data come from?
From California's official business registry. ListRiver loads each new state file, standardizes it, removes duplicates and updates its database weekly. Email and industry details are added from SMBCredit.net where available.
How do I get a list of businesses in Sonoma County, California?
Use ListRiver's list builder to filter Sonoma County, California businesses by entity type, formation date, industry and contact details, see the exact count and price, and download a CSV. Every list includes monthly refresh files.
Free to use on any site, and it updates itself every month. Copy this code and paste it into your page. Preview the chart.
Counts come from official California business registry records on file with ListRiver, current as of October 12, 2026. They include businesses that are active on the state register; dissolved and defunct entities are excluded. Contact details are added from SMBCredit.net where available. Formation months reflect the registration date the state reports. See the methodology for sources, update schedules and known limits.