New Jersey · FIPS 34039 · County seat: Elizabeth
Union County, NJ GIS & Parcel Viewer
Here is the direct link to the county parcel map covering Union County, NJ: the Union County parcel map. Below you'll find basic facts about the county, steps for using the viewer, and nearby counties.
Open the Union County parcel map ↗
Opens oms.ucnj.org in a new tab. We link out and never embed or copy parcel data.
Map and county facts
| Official map | Union County parcel map |
|---|---|
| Type | County-run map |
| Website | oms.ucnj.org |
| Access | Free, no login (checked Oct 2026) |
| County seat | Elizabeth |
| Population | 572,726 (2023 Census Bureau estimate) |
| Land area | 103 sq mi |
| FIPS code | 34039 |
Who runs this map
Union County runs this viewer (directly or through a contracted vendor), which makes it the closest thing to the source for local parcel lines. When we tested the link in October 2026 it opened with no login and no fee.
Finding a property on this map
- Open the official link in a new tab.
- Accept any disclaimer, then look for a search box that takes street addresses, owners or parcel IDs.
- Zoom in and click a parcel to see its details.
- Use the map's layer controls to add aerials or other layers if they're offered.
Rural addresses don't always geocode well. When that happens, zoom in by hand and click the parcel, or search by owner name.
About Union County
Union County had an estimated 572,726 residents in 2023, according to the Census Bureau. With about 103 square miles of land, that works out to roughly 5,560 people per square mile. By population it ranks 7th of 21 counties in New Jersey. The county seat is Elizabeth.
Nearby parcel maps
If the property sits near a county line, the parcel may belong to a neighbor. These counties border Union County:
- Essex County (state list)
- Hudson County
- Middlesex County
- Morris County
- Somerset County
- Richmond County, NY
Maps vs. surveys
Treat the map as a guide, not a boundary survey: parcel outlines are often shifted a bit from the real corners. A licensed surveyor settles exact lines.