Costilla County, county in Colorado, United States. As of 2020 county had an estimated population of 3,921 inhabitants. The county was created 160 years ago in 1861. Its county seat is "San Luis".
There are 1 city/town in Costilla County, CO. The largest city of Costilla County is San Luis with a population of 692.
San Luis, county seat of Costilla County, Colorado, United States
Cities, Towns, Neighborhoods & Other Populated Places in Costilla County.
|San Luis||County seat of Costilla County, Colorado, United States||Costilla||692|