Napa County

Parcel & Property Data

49,959Total Parcels

—Avg. Market Value

499,172Total Acres

About This Data

LandBrief holds 49,959 parcel records for Napa 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 Napa County assessor roll dated January 2021, loaded August 2026. See data sources for every county’s vintage.

Explore Napa County

Napa County by the Numbers

Median parcel size: 0.20 acres
measured from mapped boundaries
90th-percentile parcel: 12.1 acres
County land area: 481,264 acres
U.S. Census measurement
Communities: 15
11.3% of parcels outside any incorporated place

Who Owns Napa County?

Share of the county’s 49,959 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	52.9%
Companies & organizations	11.4%
Trusts & estates	34.6%
Government	0.8%
Other / unclassified	0.3%

The largest owner on record is CALIFORNIA STATE OF with 269 parcels — see the full landowner leaderboard.

Parcel Records (~49,959 total)

Showper page

Parcel ID	Owner	Address	City	Acreage
019550001000	U S A	6450 BERRYESSA KNOXVILLE RD	Unincorporated	23757.91
016140016000	NAPA COUNTY REGIONAL PARK AND OPEN SPACE DISTRICT	—	Unincorporated	1760.00
019550005000	U S A	—	Unincorporated	1675.00
019510041000	MONTICELLO RANCH LLC	—	Unincorporated	1105.19
025210021000	HARDIN WILLIAM W TR	—	Unincorporated	1011.85
032170015000	CAMP CLAIRE M TR	4964 MONTICELLO RD	Napa	971.18
032560012000	ACME ROCKET SLEDS INC	—	Unincorporated	970.18
015230008000	AHMANN-REED ANNA MARIE TR ETAL	—	Unincorporated	917.40
015060017000	MYSTERIOUS VALLEY RANCH LLC	—	Unincorporated	865.06
015070038000	VASCONI MARIO L & PATRICIA L	—	Unincorporated	835.21

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All 49,959 parcels in Napa 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 Napa County?

The Napa County assessor roll on file records 49,959 parcels across 15 communities, with 11.3% lying outside any incorporated place.

Who owns the most land in Napa County?

CALIFORNIA STATE OF holds 269 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.

What is the typical parcel size in Napa County?

Measured from mapped boundaries, the median parcel is 0.20 acres, and nine parcels in ten are under 12.1 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.

How much of Napa County is government-owned?

Government entities — federal, state, and local — hold 0.8% of the county’s parcels, classified from owner names on the roll.

How current is this data?

It comes from the Napa 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 (15)

49,959 parcels across 15 communities in Napa County.