Marin County

Parcel & Property Data

99,343Total Parcels

—Avg. Market Value

390,160Total Acres (measured from parcel boundaries)

About This Data

LandBrief holds 99,343 parcel records for Marin 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 Marin County assessor roll dated January 2021, loaded August 2026. See data sources for every county’s vintage.

Explore Marin County

Marin County by the Numbers

Median parcel size: 0.19 acres
measured from mapped boundaries
90th-percentile parcel: 0.98 acres
County land area: 332,890 acres
U.S. Census measurement
Communities: 39
3.6% of parcels outside any incorporated place

Who Owns Marin County?

Share of the county’s 99,343 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	58.1%
Companies & organizations	6.2%
Trusts & estates	34.2%
Government	1.3%
Other / unclassified	0.3%

The largest owner on record is CALIFORNIA STATE OF with 310 parcels — see the full landowner leaderboard.

Parcel Records (~99,343 total)

Showper page

Parcel ID	Owner	Address	City	Acreage
190-081-31	BANNISTER MARTIN TRUST	380 S OCEAN PKWY	Bolinas	0.26 †
190-081-39	BANNISTER MARTIN TRUST	380 S OCEAN PKWY	Bolinas	0.51 †
190-081-30	BENSON MABRY E	410 S OCEAN PKWY	Bolinas	0.24 †
199-283-02	BICER SABRI M & KATHERINE K LIVING TRUST ETAL	17 AHAB DR	Muir Beach	0.53 †
199-283-03	WYNN ROBERT A &	21 AHAB DR	Muir Beach	0.63 †
199-283-11	LEVIN WILLIAM A &	25 AHAB DR	Muir Beach	1.31 †
199-283-06	FALLS GAIL C /TR/	33 AHAB DR	Muir Beach	0.66 †
199-290-17	DYBSKY STEPHEN R & DEBRA J TRUST ETAL	37 AHAB DR	Muir Beach	1.76 †
199-283-08	KOHN RICHARD & BRENDA FAMILY TRUST ETAL	5 AHAB DR	Muir Beach	1.05 †
199-283-09	EQUITY TRUST COMPANY /CSTDN/ FBO JOHN MURRAY IRA	9 AHAB DR	Muir Beach	1.12 †

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All 99,343 parcels in Marin 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 Marin County?

The Marin County assessor roll on file records 99,343 parcels across 39 communities, with 3.6% lying outside any incorporated place.

Who owns the most land in Marin County?

CALIFORNIA STATE OF holds 310 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.

What is the typical parcel size in Marin County?

Measured from mapped boundaries, the median parcel is 0.19 acres, and nine parcels in ten are under 0.98 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.

How much of Marin County is government-owned?

Government entities — federal, state, and local — hold 1.3% of the county’s parcels, classified from owner names on the roll.

How current is this data?

It comes from the Marin 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 (39)

99,343 parcels across 39 communities in Marin County.