3 county-level rules, plus city-specific rules for 2 cities in San Mateo County, California.
Verified from official government sources
Unincorporated San Mateo County's Development Code does not set a stand-alone political-sign chapter; temporary signs are addressed within district sign standards. Along state highways, California's Outdoor Advertising Act (B&P Code 5405.3) caps temporary political signs at 32 sq ft, placed no sooner than 90 days before an election and removed within 10 days after.
Unincorporated San Mateo County's Development Code has no separate garage-sale-sign ordinance; signs are addressed through district sign standards that prohibit off-premises and abandoned signs. Signs may not be placed in the public right-of-way, and temporary signs should be removed promptly after the sale.
Unincorporated San Mateo County permits residential holiday decorations without permits. Displays must comply with electrical code, not obstruct public rights-of-way, and respect noise ordinance quiet hours (10 PM to 7 AM). Coastal zone properties may have additional restrictions.
2 cities in San Mateo County have their own sign regulations rules. Each link goes to that city's dedicated page with code citations.
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