California · FIPS 06055 · County seat: Napa
Napa County, CA GIS & Parcel Viewer
Looking for lot lines or a parcel number in Napa County, CA? The quickest route is the Napa County ArcGIS parcel map, the county parcel map we keep on file for this county. We link straight to it and add a few tips for getting around.
Open the Napa County parcel map ↗
Opens gis.countyofnapa.org in a new tab. We link out and never embed or copy parcel data.
Quick facts
| Official map | Napa County ArcGIS parcel map |
|---|---|
| Type | County-run map |
| Website | gis.countyofnapa.org |
| Access | Free, no login (checked Oct 2026) |
| County seat | Napa |
| Population | 133,216 (2023 Census Bureau estimate) |
| Land area | 748 sq mi |
| FIPS code | 06055 |
About the official source
Napa County runs this viewer (directly or through a contracted vendor), which makes it the closest thing to the source for local parcel lines. As of our October 2026 test, anyone could open it without signing in or paying.
How to use the Napa County viewer
- Open the official link. The viewer is built with ArcGIS Web AppBuilder; if a disclaimer pops up, accept it to continue.
- Use the search widget, usually in the upper left, to find a street address or parcel ID.
- Click a parcel to open its info window.
- The widget bar holds extras such as the layer list, basemap switcher, measure and print tools.
Many parcel sites expect owner names last name first. If a full name finds nothing, try just the surname.
The county in brief
Census Bureau figures put Napa County at about 133,216 people (2023 estimate) on roughly 748 square miles of land, which is about 178 residents per square mile. That makes it number 35 out of 58 California counties by population. The county seat is Napa.
Neighboring counties
Napa County shares a border with the counties below. Each link has its own official map:
Maps vs. surveys
Keep in mind that a GIS parcel layer is a tax map, not a survey. For exact boundaries, look at the recorded deed and plat or hire a licensed land surveyor.