Roosevelt County is a county located in the U.S. state of New Mexico. As of the 2020 census, the population was 19,191. Its county seat is Portales. The county was created in 1903 from Chaves and Guadalupe counties and named for the then-current President of the United States, Theodore Roosevelt. The county's eastern border is the Texas state line.

Portales is a city in and the county seat of Roosevelt County, New Mexico, United States. Its population was 12,280 at the 2010 census. Portales is located near the larger city of Clovis, and Cannon Air Force Base, a major contributor to the economy of the region.