Sign Regulations in Sonoma County, CA (2026)
2 county-level rules, plus city-specific rules for 2 cities in Sonoma County, California.
Verified from official government sources
Political Signs
Unincorporated Sonoma County requires a zoning permit for campaign and political signs, caps size at 16 or 32 square feet depending on district, and bars posting more than 90 days before the election.
Sonoma County Political Sign Rules
Some RestrictionsSonoma County Code § 26-84-030(f)
(f)Campaign and Political Signs. Campaign and political signs may be permitted in any zoning district upon being issued a zoning permit and are subject to the following criteria:(1)No more than two (2) sixteen (16) square foot single-faced...political or campaign sign is permitted, per parcel, in the R1 (single family residential) districts...(4)No signs shall be erected earlier than ninety (90...
Freeway-Facing Signs
Billboards and other outdoor advertising structures facing Highway 101 or any other freeway in unincorporated Sonoma County need a use permit and must sit at least 1,000 feet from the next outdoor advertising sign, measured along the highway's centerline.
Sonoma County Freeway-Facing Sign Rules
Some RestrictionsSonoma County Code § 26-84-030(g)(3)(i)
(3)Outdoor advertising structures and signs located along roadways which are not designated as scenic corridors shall meet the following spacing requirements:(i)Outdoor advertising structures and signs along any freeway, expressway or limited access highway: no closer than one thousand feet (1,000′) from any other outdoor advertising structure or sign, with the distance to be measured parallel ...
Sign Regulations by City in Sonoma County
2 cities in Sonoma County have their own sign regulations rules. Each link goes to that city's dedicated page with code citations.
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