Sierra County () is a county located in the U.S. state of New Mexico. As of the 2020 Census, the population was 11,576. Its county seat is Truth or Consequences.
Geography
According to the U.S. Census Bureau, the county has a total area of , of which is land and (1.4%) is water.
Adjacent counties
- Catron County - northwest
- Socorro County - north
- Lincoln County - northeast
- Otero County - east
- Doña Ana County - south
- Luna County - south
- Grant County - west
National protected areas
- Cibola National Forest (part)
- El Camino Real de Tierra Adentro National Historic Trail (part)
- Gila National Forest (part)