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Find county GIS and property maps

Browse official GIS tools, assessor map information and county map referrals. Some entries provide instructions or map indexes rather than an interactive GIS viewer.

Before you start

  • 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.

2 guides with reviewed service links · San Mateo

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

County government · San Mateo

Assessor-County Clerk-Recorder

Assessor

Parcel/Assessor Maps (opens in a new tab)Official instructions

Officially linked county property-map resource. This verifies the referral and stated label; interactive layers, parcel results, legal boundaries, buildability and application eligibility are not determined here.

Online assessor/recorded map access

The Property Maps portal allows you to download Assessor’s maps or Recorded maps such as subdivision maps and parcel maps online for free.

Official information checked October 26, 2026 · Details & sources

Source checked October 26, 2026

San Mateo County · San Mateo County — assessor recorder clerk (opens in a new tab)

Official property-office map referral: Parcel/Assessor Maps

Parcel/Assessor Maps

Saved evidence: 6530b17fc894cd34 · Agent source review

Full guide, contact details & sources →
County government · San Mateo

Planning & Building

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

County GIS & Maps (opens in a new tab)Official instructions

Officially linked county property-map resource. This verifies the referral and stated label; interactive layers, parcel results, legal boundaries, buildability and application eligibility are not determined here.

Source checked October 26, 2026

San Mateo County · San Mateo — building permit department (opens in a new tab)

Official property-office map referral: County GIS & Maps

County GIS & Maps

Saved evidence: 99e6105a669d05d3 · Agent source review

Full guide, contact details & sources →