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.
County Towns
Adjacent Counties
- Alamosa – northwest
- Conejos – west
- Huerfano – northeast
- Las Animas – east
Latest in Costilla County
Your Guide to the San Luis Valley
A bit supernatural and mysterious, the mystical San Luis Valley is one of the more unusual…
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