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4. Local Licensing Requirements


City Business Licensing Requirements

The County of Sonoma does not require a business license or tax certificate for businesses operating in the unincorporated areas of the county. However, each City in which a business will generate revenue requires a license and/or a business tax certificate. During this application process, entrepreneurs should inquire about any further required licenses, permits or endorsements

Contacts for each of the nine incorporated cities are below:

AuthorityPhone NumberWebsite
Rohnert Park(707)
Santa Rosa(707)
Windsor (707)

Sonoma County Fictitious Name Statement 

If your new venture will conduct business under a name that does not contain the surname of any and all owners, or is a corporation that will do business under a different name than is registered with the State, you will need to file a Fictitious Business Name Statement with the County of Sonoma Clerk-Recorder-Assessor’s Office. This application must be filed within 40 days of business start date.

The Clerk’s Office can be reached at:

Sonoma County Clerks' Office

585 Fiscal Drive, Room 103
Santa Rosa, CA 95403
(707) 565-3800