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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.

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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 · Alameda

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

County government · Alameda

Assessor

Serves Alameda County, California. Use the official service instructions to confirm jurisdiction and appointment requirements.

Parcel Map FAQsOfficial 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.

Assessor maps are not surveys

No. The Assessor’s Office cannot determine or verify exact property boundaries. Parcel maps are approximate representations for assessment purposes only. To determine actual property boundaries, you should hire a licensed land surveyor.

Official information checked October 26, 2026 · Details & sources

Source checked October 26, 2026

Alameda County · Alameda County — assessor (opens in a new tab)

Official property-office map referral: Parcel Map FAQs

Parcel Map FAQs

Saved evidence: 2b639b5b714f9c47 · Agent source review

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