LandBrief

Alameda County

Parcel & Property Data

406,270Total Parcels
—Avg. Market Value
493,988Total Acres (measured from parcel boundaries)

About This Data

LandBrief holds 406,270 parcel records for Alameda 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 Alameda County assessor roll dated January 2021, loaded August 2026. See data sources for every county’s vintage.

Explore Alameda County

Alameda County by the Numbers

Median parcel size
0.13 acres
measured from mapped boundaries
90th-percentile parcel
0.34 acres
County land area
471,974 acres
U.S. Census measurement
Communities
27
0.5% of parcels outside any incorporated place

Who Owns Alameda County?

Share of the county’s 406,270 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
Individuals62.2%
Companies & organizations5.8%
Trusts & estates28.4%
Government2.1%
Other / unclassified1.4%

The largest owner on record is ALAMEDA COUNTY FLOOD CONTROL with 1,258 parcels — see the full landowner leaderboard.

Parcel Records (~406,270 total)

per page
Parcel IDOwnerAddressCityAcreage
069 002811300CITY OF ALAMEDAE SHORE DR ALAMEDA 94501Alameda0.32 †
069 002811400CITY OF ALAMEDAE SHORE DR ALAMEDA 94501Alameda0.34 †
069 002811500CITY OF ALAMEDAE SHORE DR ALAMEDA 94501Alameda0.34 †
069 002811600CITY OF ALAMEDAE SHORE DR ALAMEDA 94501Alameda0.30 †
069 002811700CITY OF ALAMEDAE SHORE DR ALAMEDA 94501Alameda0.29 †
069 002811800CITY OF ALAMEDAE SHORE DR ALAMEDA 94501Alameda0.30 †
069 002811900CITY OF ALAMEDAE SHORE DR ALAMEDA 94501Alameda0.29 †
069 002812000CITY OF ALAMEDAE SHORE DR ALAMEDA 94501Alameda0.31 †
069 002812100CITY OF ALAMEDAE SHORE DR ALAMEDA 94501Alameda0.30 †
069 002812200CITY OF ALAMEDAE SHORE DR ALAMEDA 94501Alameda0.33 †
Page 1 of 40627

Download Alameda County parcel data

All 406,270 parcels in Alameda County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.

Get Alameda County on FreeParcelData →

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Frequently Asked Questions

How many parcels are in Alameda County?

The Alameda County assessor roll on file records 406,270 parcels across 27 communities, with 0.5% lying outside any incorporated place.

Who owns the most land in Alameda County?

ALAMEDA COUNTY FLOOD CONTROL holds 1,258 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.

What is the typical parcel size in Alameda County?

Measured from mapped boundaries, the median parcel is 0.13 acres, and nine parcels in ten are under 0.34 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.

How much of Alameda County is government-owned?

Government entities — federal, state, and local — hold 2.1% of the county’s parcels, classified from owner names on the roll.

How current is this data?

It comes from the Alameda County assessor roll dated January 2021. 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 (27)

406,270 parcels across 27 communities in Alameda County.