San Acacio is an unincorporated community and a census-designated place (CDP) located in and governed by Costilla County, Colorado, United States. The population of the San Acacio CDP was 56 at the 2020 United States census. The Sanford post office (Zip Code 81151) serves San Acacio postal addresses.

History

San Acacio is located in the Rio Culebra valley of the Sangre de Cristo Land Grant which was awarded to the family of Carlos Beaubien in 1843. The San Acacio Post Office was established in 1909 and remained in operation until 1992. The community was named after Saint Acacius.

Historic buildings and landmarks

Geography

San Acacio is located in western Costilla County in the San Luis Valley of southern Colorado. Colorado State Highway 142 runs through San Acacio, leading east 8 mi to San Luis and west 25 mi to U.S. Route 285 at Romeo. The San Acacio CDP has an area of 3.255 km2, all land.

Demographics

The United States Census Bureau initially defined the San Acacio CDP for the United States Census 2010.