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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 · Contra Costa

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

County government · Contra Costa

Assessor

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

Maps & Property InformationOfficial 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

Contra Costa County · Contra Costa County — assessor (opens in a new tab)

Official property-office map referral: Maps & Property Information

Maps & Property Information

Saved evidence: 35328b7978564df7 · Agent source review

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