California · FIPS 06013 · County seat: Martinez
Contra Costa County, CA GIS & Parcel Viewer
Contra Costa County, California parcel data lives on the Contra Costa County parcel map. Open it below in a new tab, then use the short steps on this page to find a property fast.
Open the Contra Costa County parcel map ↗
Opens ccmap.cccounty.us in a new tab. We link out and never embed or copy parcel data.
Contra Costa County at a glance
| Official map | Contra Costa County parcel map |
|---|---|
| Type | County-run map |
| Website | ccmap.cccounty.us |
| Access | Free, no login (checked Oct 2026) |
| County seat | Martinez |
| Population | 1,155,025 (2023 Census Bureau estimate) |
| Land area | 717 sq mi |
| FIPS code | 06013 |
Where the parcel data comes from
Contra Costa County runs this viewer (directly or through a contracted vendor), which makes it the closest thing to the source for local parcel lines. When we tested the link in October 2026 it opened with no login and no fee.
Finding a property on this map
- Press the button above to open the county's own web map.
- Search for the property or pan and zoom to it.
- Click the lot to bring up what the county publishes about it.
- Look for print or measure tools if you need a quick map or rough size.
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.
Contra Costa County by the numbers
Census Bureau figures put Contra Costa County at about 1,155,025 people (2023 estimate) on roughly 717 square miles of land, which is about 1,611 residents per square mile. By population it ranks 9th of 58 counties in California. Another 87 square miles of water fall within its lines, according to Census mapping. Martinez serves as the county seat.
Neighboring counties
Parcels close to the edge of Contra Costa County can fall in the next county over. Neighboring counties:
- Alameda County
- Marin County
- Sacramento County
- San Francisco County
- San Joaquin County
- Solano County
- Sonoma County
Maps vs. surveys
Treat the map as a guide, not a boundary survey: parcel outlines are often shifted a bit from the real corners. A licensed surveyor settles exact lines.