Fort Garland was a United States Army post from 1858 to 1883. Today, Fort Garland is a historic unincorporated community, a post office, and a census-designated place (CDP) located in and governed by Costilla County, Colorado, United States. At the United States Census 2020, the population of the Fort Garland CDP was 464, while the population of the 81133 ZIP Code Tabulation Area was 840 including adjacent areas. The Fort Garland post office has the ZIP Code 81133. Fort Garland is a part of the Alamosa, CO Micropolitan Statistical Area.