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 40 at the 2010 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 San Acacio Mission Church (Capilla de Viejo San Acacio) – Built early in the 1860s, the Mission of San Acacio is the oldest standing church in Colorado. Constructed with 24-inch adobe walls, the mission underwent extensive restoration during the 1990s. In addition to stabilizing the foundation, several wooden columns were added to the interior to take the weight of the roof off the fragile walls. An altar screen, or retablo, was commissioned from Maria Romero Cash, a New Mexican artist specializing in religious folk art. San Acacio Bank Old San Acacio Cemetery – In old San Acacio there is a cemetery nicknamed Viejo Cemetery. The cemetery is located in a churchyard in Old San Acacio. The oldest marked grave in the cemetery is from 1907, and the cemetery is currently full. New San Acacio Cemetery – The new cemetery is located 3/4 mile south of San Acacio. It is a public cemetery, and the oldest marked grave in the cemetery is from 1906. It is currently in use. 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 to San Luis and west to U.S. Route 285 at Romeo. The San Acacio CDP has an area of , all land. Demographics The United States Census Bureau initially defined the for the See also Outline of Colorado Index of Colorado-related articles State of Colorado Colorado cities and towns Colorado census designated places Colorado counties Costilla County, Colorado References External links Capilla de Viejo San Acacio @ History Colorado Capilla de Viejo San Acacio @ ColoradoEncyclopedia.org Conejos County website Census-designated places in Costilla County, Colorado Census-designated places in Colorado 1850 establishments in New Mexico Territory