Antonito is a Statutory Town located in Conejos County, Colorado, United States. The town population was 647 at the 2020 United States Census. Antonito began life as a sheep herding camp known as San Antonio Junction, referring to its proximity to the Conejos and San Antonio rivers. When the Denver & Rio Grande Railroad built its line south from Ala…Antonito is a Statutory Town located in Conejos County, Colorado, United States. The town population was 647 at the 2020 United States Census. Antonito began life as a sheep herding camp known as San Antonio Junction, referring to its proximity to the Conejos and San Antonio rivers. When the Denver & Rio Grande Railroad built its line south from Alamosa, the town was renamed Antonito and became an important town on the railroad line. The San Antonio, Colorado, post office moved north to Antonito on January 24, 1881, and the Town of Antonito was incorporated on December 29, 1889. There are currently no major industries located in Antonito, but the historic Cumbres & Toltec Scenic Railroad has one terminus in Antonito and the other in Chama, New Mexico. The C&TS also has maintenance facilities and rail yard in the town.