Capulin is an unincorporated town, a post office, and a census-designated place located in and governed by Conejos County, Colorado, United …Capulin is an unincorporated town, a post office, and a census-designated place located in and governed by Conejos County, Colorado, United States. The Capulin post office has the ZIP Code 81124. At the United States Census 2010, the population of the Capulin CDP was 200, while the population of the 81124 ZIP Code Tabulation Area was 565 including adjacent areas.