County GIS · State lines · October 20, 2026
New Mexico–Texas Border Counties: Parcel Maps on Both Sides
All 24 counties on the New Mexico–Texas line, with seats, 2023 populations and a link to each official parcel map, plus what changes at the state line.
Looking for the counties on the New Mexico–Texas border and their parcel maps? According to the Census Bureau's county adjacency file, 8 New Mexico counties touch 16 Texas counties along the line. Each one keeps its own property records and its own parcel viewer, so land near the line often means checking two counties in two states.
A farm, hunting tract or lake lot can sit in one state while the road, the neighbors or the rest of the property are in the other. This page lists every county that touches the line on either side, with links to each official parcel map.
New Mexico–Texas border at a glance
- Counties on the line: 24 (8 in New Mexico, 16 in Texas)
- With a verified public parcel viewer in our directory: 24 of 24
- Residents, 2023 estimates: about 504,904 on the New Mexico side and 994,719 on the Texas side
- Most populous on each side: Doña Ana County, NM (225,210) and El Paso County, TX (869,880)
- Largest by land area: Otero County, NM (6,613 sq mi) and Hudspeth County, TX (4,571 sq mi)
New Mexico counties on the line
| County | Seat | Land (sq mi) | 2023 pop. | Parcel viewer |
|---|---|---|---|---|
| Curry County | Clovis | 1,406 | 47,222 | NM Office of the State Engineer County Parcels 2025 layer in ArcGIS Map Viewer |
| Doña Ana County | Las Cruces | 3,808 | 225,210 | ArcGIS Instant Apps |
| Eddy County | Carlsbad | 4,176 | 60,275 | NM Office of the State Engineer County Parcels 2025 layer in ArcGIS Map Viewer |
| Lea County | Lovington | 4,392 | 72,101 | NM Office of the State Engineer County Parcels 2025 layer in ArcGIS Map Viewer |
| Otero County | Alamogordo | 6,613 | 68,835 | NM Office of the State Engineer County Parcels 2025 layer in ArcGIS Map Viewer |
| Quay County | Tucumcari | 2,874 | 8,510 | ArcGIS Experience Builder |
| Roosevelt County | Portales | 2,446 | 18,787 | NM Office of the State Engineer County Parcels 2025 layer in ArcGIS Map Viewer |
| Union County | Clayton | 3,825 | 3,964 | NM Office of the State Engineer County Parcels 2025 layer in ArcGIS Map Viewer |
Texas counties on the line
| County | Seat | Land (sq mi) | 2023 pop. | Parcel viewer |
|---|---|---|---|---|
| Andrews County | Andrews | 1,501 | 18,664 | appraisal district map |
| Bailey County | Muleshoe | 827 | 6,672 | appraisal district map |
| Cochran County | Morton | 775 | 2,509 | appraisal district map |
| Culberson County | Van Horn | 3,812 | 2,196 | Prodigy CAD map |
| Dallam County | Dalhart | 1,503 | 7,237 | appraisal district map |
| Deaf Smith County | Hereford | 1,497 | 18,347 | appraisal district map |
| El Paso County | El Paso | 1,013 | 869,880 | appraisal district map |
| Gaines County | Seminole | 1,502 | 22,523 | appraisal district map |
| Hartley County | Channing | 1,462 | 5,145 | appraisal district map |
| Hudspeth County | Sierra Blanca | 4,571 | 3,451 | appraisal district map |
| Loving County | Mentone | 669 | 43 | appraisal district map |
| Oldham County | Vega | 1,501 | 1,783 | appraisal district map |
| Parmer County | Farwell | 881 | 9,617 | appraisal district map |
| Reeves County | Pecos | 2,635 | 11,770 | appraisal district map |
| Winkler County | Kermit | 841 | 7,414 | Prodigy CAD map |
| Yoakum County | Plains | 800 | 7,468 | appraisal district map |
Which counties face each other
The Census adjacency file pairs counties that share a boundary. Use it to find the county across the line from the one you know:
- Curry County, NM borders Bailey County, TX, Deaf Smith County, TX, Parmer County, TX
- Doña Ana County, NM borders El Paso County, TX
- Eddy County, NM borders Culberson County, TX, Loving County, TX, Reeves County, TX
- Lea County, NM borders Andrews County, TX, Cochran County, TX, Gaines County, TX, Loving County, TX, Winkler County, TX, Yoakum County, TX
- Otero County, NM borders Culberson County, TX, El Paso County, TX, Hudspeth County, TX
- Quay County, NM borders Deaf Smith County, TX, Hartley County, TX, Oldham County, TX
- Roosevelt County, NM borders Bailey County, TX, Cochran County, TX
- Union County, NM borders Dallam County, TX, Hartley County, TX
What changes when you cross the line
- Different viewers. On the New Mexico side the official maps run on: NM Office of the State Engineer County Parcels 2025 layer in ArcGIS Map Viewer (6); ArcGIS Instant Apps (1); ArcGIS Experience Builder (1). On the Texas side: appraisal district map (14); Prodigy CAD map (2). Search boxes, parcel ID formats and the details shown in pop-ups will differ.
- Different records offices. Deeds, plats and tax bills are kept by the county where the parcel sits.
- Different rules. Zoning, septic permits and property tax are set locally and by each state, so check with the county on the side where you plan to build or buy.
Researching a tract that crosses the line
- Find the parcel in both counties' viewers. Each side will show only its own piece, with its own parcel number.
- Pull the recorded deed from each county's register or recorder, since each county records only the land inside its own boundary.
- Expect two tax bills, one from each county, and check each state's rules for homestead or farm exemptions.
- For a sale, a fence or a building permit, hire a licensed surveyor familiar with the line; tax-map lines are drawings, not surveys.
A quick way to check which side a spot is on
Tap the spot on the Platbookmapper Land Map. Its land report names the county and links straight to that county's parcel viewer, plus FEMA flood, USGS elevation, USDA soil and wetland results.
Related guides
More: New Mexico counties · Texas counties
Sources
- U.S. Census Bureau county adjacency file, used for which counties share the line.
- U.S. Census Bureau Gazetteer files, 2020 county land area.
- U.S. Census Bureau, Population Estimates Program, county totals, Vintage 2023 (July 1, 2023 estimates)
- Platbookmapper county GIS directory (live data file behind our county pages, pulled October 20, 2026) for each county's official parcel viewer.
- County seats: Wikidata (county seat property), cross-checked against Census place names.