New Mexico · FIPS 35059 · County seat: Clayton
Union County, NM GIS & Parcel Viewer
Here is the direct link to the statewide parcel map covering Union County, NM: NM Office of the State Engineer County Parcels 2025 layer (ArcGIS Map Viewer). Below you'll find basic facts about the county, steps for using the viewer, and nearby counties.
Open the Union County statewide map ↗
Opens arcgis.com in a new tab. We link out and never embed or copy parcel data.
Union County at a glance
| Official map | NM Office of the State Engineer County Parcels 2025 layer (ArcGIS Map Viewer) |
|---|---|
| Type | Statewide map (covers all of New Mexico) |
| Website | arcgis.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | Clayton |
| Population | 3,964 (2023 Census Bureau estimate) |
| Land area | 3,825 sq mi |
| FIPS code | 35059 |
Who runs this map
The link goes to a statewide map (NM Office of the State Engineer County Parcels 2025 layer (ArcGIS Map Viewer)). It shows parcels for Union County along with the rest of New Mexico. Because a state agency compiles this layer from local data, check with the Union County assessor or recorder before relying on a recent change. Our October 2026 check found the map open to the public, with no account or payment needed.
Finding a property on this statewide map
- Open the statewide map with the button above.
- Search for an address in Union County, or zoom to the county on the map.
- Click a parcel to see the attributes the state layer includes.
- Write down the parcel number and use it for records searches with the Union County assessor or recorder.
Have a tax bill handy? The parcel or account number on it is usually the fastest way to search.
Union County by the numbers
Union County had an estimated 3,964 residents in 2023, according to the Census Bureau. With about 3,825 square miles of land, that works out to roughly 1.0 people per square mile. By population it ranks 30th of 33 counties in New Mexico. Clayton serves as the county seat.
Nearby parcel maps
Union County shares a border with the counties below. Each link has its own official map:
- Colfax County
- Harding County
- Quay County
- Baca County, CO (state list)
- Cimarron County, OK
- Dallam County, TX
- Hartley County, TX
- Las Animas County, CO
Before you rely on the lines
Keep in mind that a GIS parcel layer is a tax map, not a survey. For exact boundaries, look at the recorded deed and plat or hire a licensed land surveyor.