LandBrief

Contra Costa County

Parcel & Property Data

381,896Total Parcels
—Avg. Market Value
430,925Total Acres

About This Data

LandBrief holds 381,896 parcel records for Contra Costa County, sourced from county records. Each includes the parcel boundary, and — where the county publishes them — owner, situs address, acreage, assessed values and legal description.

Data from the Contra Costa County assessor roll dated June 2022, loaded August 2026. See data sources for every county’s vintage.

Explore Contra Costa County

Contra Costa County by the Numbers

Median parcel size
0.16 acres
measured from mapped boundaries
90th-percentile parcel
0.56 acres
County land area
458,814 acres
U.S. Census measurement
Communities
59
0.9% of parcels outside any incorporated place

Who Owns Contra Costa County?

Share of the county’s 381,896 parcels by the kind of owner on record. Classified from owner names, so the boundaries are approximate; an entity the rules cannot place counts as an individual.

Owner typeShare of parcels
Individuals92.8%
Companies & organizations5.6%
Trusts & estates0.3%
Government0.6%
Other / unclassified0.7%

The largest owner on record is EAST BAY REGIONAL PARK DIST with 728 parcels — see the full landowner leaderboard.

Parcel Records (~381,896 total)

per page
Parcel IDOwnerAddressCityAcreage
267030021EAST BAY MUNICIPAL UTILITY DIS520 SAN PABLO DAM RDOrinda963.58
267030021EAST BAY MUNICIPAL UTILITY DIS520 SAN PABLO DAM RDOrinda963.58
267030021EAST BAY MUNICIPAL UTILITY DIS520 SAN PABLO DAM RDOrinda963.58
100380700CALIFORNIA STATE OF—Unincorporated946.00
252070001EAST BAY MUNICIPAL UTILITY DIS3849 MT DIABLO BLVDLafayette923.09
405020009EAST BAY REGIONAL PARK DIST5551 GIANT HWYSan Pablo906.86
405020009EAST BAY REGIONAL PARK DIST5551 GIANT HWYSan Pablo906.86
205050007NIELSEN ROBERT JOHN JR—Unincorporated837.77
094360018KELLER CANYON LANDFILL CONone BAILEY RDUnincorporated833.20
194050002MT DIABLO STATE PARKNone MOUNT DIABLO SCENIC BLVDUnincorporated813.55
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Download Contra Costa County parcel data

All 381,896 parcels in Contra Costa County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.

Get Contra Costa County on FreeParcelData →

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Frequently Asked Questions

How many parcels are in Contra Costa County?

The Contra Costa County assessor roll on file records 381,896 parcels across 59 communities, with 0.9% lying outside any incorporated place.

Who owns the most land in Contra Costa County?

EAST BAY REGIONAL PARK DIST holds 728 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.

What is the typical parcel size in Contra Costa County?

Measured from mapped boundaries, the median parcel is 0.16 acres, and nine parcels in ten are under 0.56 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.

How much of Contra Costa County is government-owned?

Government entities — federal, state, and local — hold 0.6% of the county’s parcels, classified from owner names on the roll.

How current is this data?

It comes from the Contra Costa County assessor roll dated June 2022. Counties deliver on their own schedules; the methodology page explains how records are processed and the data sources page tracks every county’s vintage.

Browse by City (59)

381,896 parcels across 59 communities in Contra Costa County.