Costilla County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 3,499. The county seat is San Luis, the oldest continuously occupied town in Colorado. Wikipedia
Population: 3,603 (2022)
Cities: San Luis, Fort Garland, Blanca, and more
Area: 1,230 mi²
Congressional district: 3rd
Founded: November 1, 1861
Seat: San Luis