There are 5 real estate agents found in Costilla County, CO. There are 5 cities in Costilla County which include Fort Garland , San Luis , Blanca , Jaroso , and Chama . There are 5 zip codes in Costilla County which include 81133 , 81152 , 81123 , 81138 , and 81126 . View our Costilla County real estate area information to learn about the weather, local school districts, demographic data, and general information about Costilla County, CO. Get in touch with a Costilla County real estate agent who can help you find the home of your dreams in Costilla County. Use our mortgage calculator to see how much it would be to finance a home in Costilla County. Not ready to buy yet? Find and compare apartments for rent in Costilla County.