LandBrief

Union County

Parcel & Property Data

149,086Total Parcels
—Avg. Market Value
54,713Total Acres (measured from parcel boundaries)

About This Data

LandBrief holds 149,086 parcel records for Union 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 Union County assessor roll dated September 2022, loaded August 2026. See data sources for every county’s vintage.

Explore Union County

Union County by the Numbers

Median parcel size
0.14 acres
measured from mapped boundaries
90th-percentile parcel
0.42 acres
County land area
65,771 acres
U.S. Census measurement
Communities
22
36.0% of parcels outside any incorporated place

Who Owns Union County?

Share of the county’s 149,086 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
Individuals87.4%
Companies & organizations9.7%
Trusts & estates1.5%
Government1.0%
Other / unclassified0.5%

The largest owner on record is MUTUAL HSE CORP with 526 parcels — see the full landowner leaderboard.

Parcel Records (~149,086 total)

per page
Parcel IDOwnerAddressCityAcreage
2004-000010000-021040000-00000PORT AUTHORITY OF NY & NJ—Elizabeth771.58 †
2004-000010000-01293000B-00000PORT AUTHORITY OF NY & NJ—Elizabeth701.81 †
2010-000020000-000040000-00000COUNTY OF UNION—Mountainside629.35 †
2017-016050000-000010000-00000BALTUSROL GOLF CLUB—Unincorporated464.13 †
2016-049010000-000010000-00000CTY OF UNION DIV OF FACILITIES MGMT—Unincorporated424.53 †
2016-142010000-000010000-00000UNION COUNTY DEPT OF PARKS & RECREA—Unincorporated310.87 †
2016-141010000-000010000-00000UNION COUNTY DEPT OF PARKS & RECREA—Unincorporated252.11 †
2009-005870000-000010001-00000LINDEN LOGISTICS CENTER CONDO ASSOC—Linden29.16 †
2004-000010000-01206000C-00000PORT AUTHORITY OF NY & NJ—Elizabeth222.42 †
2008-001840000-000030000-00000COUNTY OF UNION C/O COUNTY MANAGER—Kenilworth215.37 †
Page 1 of 14909

Download Union County parcel data

All 149,086 parcels in Union County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.

Get Union County on FreeParcelData →

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Frequently Asked Questions

How many parcels are in Union County?

The Union County assessor roll on file records 149,086 parcels across 22 communities, with 36.0% lying outside any incorporated place.

Who owns the most land in Union County?

MUTUAL HSE CORP holds 526 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.

What is the typical parcel size in Union County?

Measured from mapped boundaries, the median parcel is 0.14 acres, and nine parcels in ten are under 0.42 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.

How much of Union County is government-owned?

Government entities — federal, state, and local — hold 1.0% of the county’s parcels, classified from owner names on the roll.

How current is this data?

It comes from the Union County assessor roll dated September 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 (22)

149,086 parcels across 22 communities in Union County.