Otero County is a county located in the U.S. state of New Mexico. As of the 2020 census, the population was 67,839. Its county seat is Alamogordo. Its southern boundary is the Texas state line. It is named for Miguel Antonio Otero, the territorial governor when the county was created.

Chaves County is a county in New Mexico, United States. As of the 2020 census, the population was 65,157. Its county seat is Roswell. Chaves County was named for Colonel Jose Francisco Chaves, a military leader there during the Civil War and later in Navajo campaigns. The county was created by the New Mexico Territorial Legislature on February 25, 1889, out of land from Lincoln County.