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Look up zoning maps in California

Official zoning and land-use maps, map directories, instructions and purpose-labelled zoning inquiry channels. County/city scope, historical or partial maps and offline access are identified in each entry.

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In California, 58 county departments and 1 city government publish 60 official links for this service, 3 of them online. Reviewed requirements cover availability notices (44) and processing time (1). 56 counties have a page for it below.

Before you start · 2 things to check

Start with the jurisdiction of the property. County permit offices may serve only unincorporated areas.
Use the official map and confirm project requirements with the planning or building office.

1 guide with reviewed service links · San Mateo

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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 · San Mateo

Planning & Building

San Mateo County building permit services. Confirm which county or city agency handles your property before applying.

San Mateo unincorporated zoning GIS instructionsOfficial instructions

Planning and Building gives nine-digit APN search instructions and the LAND USE → Unincorporated SMC Zoning layer. Multiple zoning overlays may apply; a map result must be read with each relevant ordinance section.

Planning GIS lookup input requirement

You will need the 9-digit APN (0XX-XXX-XX0) for the property. The GIS Database may not be able to find property-specific information by address.

Official information checked October 26, 2026 · Details & sources

Multiple zoning overlays require the applicable ordinance sections

Each “layer” represents a distinct chapter or section in the County’s Zoning Regulations.

Official information checked October 26, 2026 · Details & sources

Source checked October 26, 2026

San Mateo official map information · San Mateo official zoning map information candidate (opens in a new tab)

Official county map/provider evidence: exact named map, actual layer list, access instructions or limitation

Click the “Unincorporated SMC Zoning" layer” check box to display Zoning Districts.

Saved evidence: 20adb568ee653c8c · Agent source review

Full guide, contact details & sources →

Look up zoning maps in California

Planning & Building

Look up zoning maps by county