Founded in 1921, Harding County is one of 33 counties in the state of New Mexico. Historically, Harding County was formed from parts of Mora County and Union County. The city of Mosquero is the county seat. With FIPS code of 21, Harding County has a population of 639 and area of 2,126 square miles (5,506 km2).
List of all cities in Harding County, NM alphabetically
| City/Town | Postal Code | Area Code |
| Albert, NM | 87733 | 575 |
| Mills, NM | 87730 | 575 |
| Mosquero, NM | 87733 | 575 |
| Roy, NM | 87743 | 575 |
| Solano, NM | 87746 | 575 |