California · FIPS 06001 · County seat: Oakland
Alameda County, CA GIS & Parcel Viewer
Looking for lot lines or a parcel number in Alameda County, CA? The quickest route is Parcel Viewer for Alameda County, 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 Alameda County parcel map ↗
Opens acgov.maps.arcgis.com in a new tab. We link out and never embed or copy parcel data.
Map and county facts
| Official map | Parcel Viewer for Alameda County |
|---|---|
| Type | County-run map |
| Website | acgov.maps.arcgis.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | Oakland |
| Population | 1,622,188 (2023 Census Bureau estimate) |
| Land area | 737 sq mi |
| FIPS code | 06001 |
Who runs this map
It is a county-level map: Alameda 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 Alameda 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.
If an address search comes up empty, try the parcel number from a tax bill or deed instead, or click the lot on the map.
The county in brief
The U.S. Census Bureau estimated Alameda County's population at 1,622,188 in 2023, spread over about 737 square miles of land, or roughly 2,201 people per square mile. That makes it number 7 out of 58 California counties by population. Another 84 square miles of water fall within its lines, according to Census mapping. Its county seat is Oakland.
Nearby parcel maps
Parcels close to the edge of Alameda County can fall in the next county over. Neighboring counties:
- Contra Costa County
- San Francisco County
- San Joaquin County
- San Mateo County
- Santa Clara County
- Stanislaus County (state list)
More on Alameda County parcel maps
Maps vs. surveys
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.