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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 · Napa

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County government · Napa

Assessor

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

Assessor Parcel Maps - Subscription Only (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. The official referral labels this resource subscription-only.

Subscription access and separate map charges

Map Subscriptions: Subscriptions for online access to filed maps and assessor parcel maps are also available for customers regularly needing filed or assessor maps. The charge for maps is the same by subscription but you can download the maps directly and be charged automatically. Please complete an Online Map Access Sign-Up application.

Official information checked October 26, 2026 · Details & sources

Source checked October 26, 2026

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

Official property-office map referral: Assessor Parcel Maps - Subscription Only

Assessor Parcel Maps - Subscription Only

Saved evidence: 5fc0cd93d5a10427 · Agent source review

Geographic Information Systems (GIS) (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

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

Official property-office map referral: Geographic Information Systems (GIS)

Geographic Information Systems (GIS)

Saved evidence: 5fc0cd93d5a10427 · Agent source review

Full guide, contact details & sources →