California · FIPS 06045 · County seat: Ukiah
Mendocino County, CA GIS & Parcel Viewer
Looking for lot lines or a parcel number in Mendocino County, CA? The quickest route is the Mendocino 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 Mendocino County parcel map ↗
Opens arcgis.com in a new tab. We link out and never embed or copy parcel data.
Mendocino County at a glance
| Official map | Mendocino County ArcGIS parcel map |
|---|---|
| Type | County-run map |
| Website | arcgis.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | Ukiah |
| Population | 89,108 (2023 Census Bureau estimate) |
| Land area | 3,507 sq mi |
| FIPS code | 06045 |
Who runs this map
It is a county-level map: Mendocino County or the company it hires keeps the parcel layer up to date. As of our October 2026 test, anyone could open it without signing in or paying.
How to use the Mendocino County viewer
- Press the button above. The map opens in Esri's ArcGIS Map Viewer in a new tab.
- Type an address or place name into the search box at the top, or drag and zoom the map yourself.
- Click inside a parcel outline. A pop-up lists whatever attributes the publisher shares, such as a parcel ID or acreage.
- Open the Layers panel to hide or show parcels, and use the Basemap button to switch to aerial imagery.
Rural addresses don't always geocode well. When that happens, zoom in by hand and click the parcel, or search by owner name.
Mendocino County by the numbers
Mendocino County had an estimated 89,108 residents in 2023, according to the Census Bureau. With about 3,507 square miles of land, that works out to roughly 25 people per square mile. Among California's 58 counties, it is the 38th largest by population. Census maps also count about 371 square miles of water inside its boundary. Its county seat is Ukiah.
Neighboring counties
If the property sits near a county line, the parcel may belong to a neighbor. These counties border Mendocino County:
Before you rely on the lines
Online parcel lines are drawn for tax and planning use. They can be off by several feet, so use a recorded plat or a licensed surveyor for fences, setbacks or a sale.