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San Luis Colorado National Historic District
San Luis, Colorado. Photo: Jeffrey Beall

Costilla County, Colorado

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Costilla County’s seat, San Luis, is Colorado’s oldest town. The county was the first region in the state to be occupied by European-Americans, and one of the original 17 Colorado counties created in 1861.

Named for the Costilla River, Costilla County is the ninth-least populous county in the state, home to 3,524 residents as of the 2010 census.

Visit the Costilla County Government website.

Costilla County Colorado Map
Costilla County map.

County Towns

  • Blanca
  • Chama
  • Fort Garland
  • San Luis

Adjacent Counties

  • Alamosa – northwest
  • Conejos – west
  • Huerfano – northeast
  • Las Animas – east
Costilla County Courthouse San Luis
Costilla County Courthouse in San Luis. Photo: John Deacon

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