Cities and Towns in Union County, New Mexico
Founded in 1893, Union County is one of 33 counties in the state of New Mexico. Historically, Union County was formed from parts of Colfax County, Mora County and San Miguel County. The city of Clayton is the county seat. With FIPS code of 59, Union County has a population of 4,107 and area of 3,830 square miles (9,920 km²).
List of all cities in Union County, NM alphabetically
| City/Town | Postal Code | Area Code |
| Amistad, NM | 88410 | 575 |
| Bueyeros, NM | 88415 | 575 |
| Capulin, NM | 88414 | 575 |
| Capulin Mountain National Mo, NM | 88414 | 575 |
| Clapham, NM | 88415 | 575 |
| Clayton, NM | 88415 | 575 |
| Des Moines, NM | 88418 | 575 |
| Farley, NM | 88422 | 575 |
| Folsom, NM | 88419 | 575 |
| Gladstone, NM | 88422 | 575 |
| Grenville, NM | 88424 | 575 |
| Hayden, NM | 88410 | 575 |
| Mount Dora, NM | 88424 | 575 |
| Rosebud, NM | 88410 | 575 |
| Sedan, NM | 88436 | 575 |
| Seneca, NM | 88415 | 575 |
| Sofia, NM | 88424 | 575 |
| Stead, NM | 88415 | 575 |
| Thomas, NM | 88415 | 575 |
