Find a service by task

Check or apply for a business license

Check local business license or business tax certificate requirements, the right authority and application options.

Before you start

Start with where your business is located and where it will operate. A county license may apply only to unincorporated areas or specific activities; cities can have their own requirements.
Some county offices provide guidance or referrals and do not issue a general business license. Read the entry before choosing an application.
A business license or tax certificate, an FBN/DBA filing, business entity registration and a professional license serve different purposes. Zoning, health and other activity permits may also apply. Business stormwater registration is a separate local programme where required.
Check the license period, renewal date and rules for changes in ownership or location. A renewal may not cover a move or a new owner. Fees and application steps depend on the license category.

1 guide with reviewed service links · Sonoma

Choose a county on the map

Highlighted counties have a reviewed service guide matching this selection. An agency may serve only a city or part of a county.

California58 counties

County directory Reviewed service guides available

Map for browsing; agency service areas may differ.

Map source

U.S. Census boundaries via U.S. Atlas · 2017 edition, simplified for display.

County government · Sonoma

Sonoma County Economic Development Collaborative — licensing guidance

Business licensing requirements and referrals depend on the business activity and its location. Read the specific service scope before applying.

Local business licensing: cities and unincorporated Sonoma CountyOfficial instructions

The county EDC distinguishes the nine cities from unincorporated Sonoma County. Its non-issuance guidance does not waive zoning, activity permits or separate business registrations.

Source checked October 16, 2026

Sonoma County Economic Development Collaborative · Sonoma County local licensing requirements (opens in a new tab)

Reviewed business licensing instructions

If your business is located or operating in unincorporated Sonoma County (outside a city boundary), the County of Sonoma does not require a business license or tax certificate.

Saved evidence: ae6d38fe1020a422 · Agent source review

Full guide, contact details & sources →