San Mateo County

Parcel & Property Data

220,742Total Parcels

—Avg. Market Value

530,376Total Acres (measured from parcel boundaries)

About This Data

LandBrief holds 220,742 parcel records for San Mateo 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 San Mateo County assessor roll dated January 2021, loaded August 2026. See data sources for every county’s vintage.

Explore San Mateo County

San Mateo County by the Numbers

Median parcel size: 0.15 acres
measured from mapped boundaries
90th-percentile parcel: 2.1 acres
County land area: 287,117 acres
U.S. Census measurement
Communities: 38
1.4% of parcels outside any incorporated place

Who Owns San Mateo County?

Share of the county’s 220,742 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 type	Share of parcels
Individuals	50.7%
Companies & organizations	4.8%
Trusts & estates	42.9%
Government	1.4%
Other / unclassified	0.2%

The largest owner on record is COASTSIDE LAND TRUST with 351 parcels — see the full landowner leaderboard.

Parcel Records (~220,742 total)

Showper page

Parcel ID	Owner	Address	City	Acreage
036021010	ZOLLER CARRIE L	1360 EAST AV, MONTARA	Montara	0.08 †
036061180	SCHNEIDER STEPHEN A TR	1165 EAST AVE, MONTARA	Montara	0.16 †
036063010	GILMOUR DAVID R & LISA A	1265 EAST AVE, MONTARA	Montara	0.12 †
036017340	MCCLINTOCK CONSTANCE A TR	1320 EAST AVE, MONTARA	Montara	0.18 †
036092010	SULLIVAN CHARLES D TR	1425 EAST AVE, MONTARA	Montara	0.12 †
036092260	RACE DAREN	1445 EAST AVE, MONTARA	Montara	0.12 †
036095310	SCHEINKER DAVID	1475 EAST AVE, MONTARA	Montara	0.12 †
036024010	BERGMAN ERIC M	1480 EAST AVE, MONTARA	Montara	0.32 †
036095250	GEISER CAMERON MONTAGUE TR	1485 EAST AVE, MONTARA	Montara	0.14 †
036033010	WOODBRIDGE CHRISTOPHER	1650 EAST AVE, MONTARA	Montara	0.13 †

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All 220,742 parcels in San Mateo County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.

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Frequently Asked Questions

How many parcels are in San Mateo County?

The San Mateo County assessor roll on file records 220,742 parcels across 38 communities, with 1.4% lying outside any incorporated place.

Who owns the most land in San Mateo County?

COASTSIDE LAND TRUST holds 351 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.

What is the typical parcel size in San Mateo County?

Measured from mapped boundaries, the median parcel is 0.15 acres, and nine parcels in ten are under 2.1 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.

How much of San Mateo County is government-owned?

Government entities — federal, state, and local — hold 1.4% of the county’s parcels, classified from owner names on the roll.

How current is this data?

It comes from the San Mateo 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 (38)

220,742 parcels across 38 communities in San Mateo County.