Mosca is an unincorporated community and a U.S. Post Office in Alamosa County, Colorado, United States. Mosca's population is 1,072 as of the 2020 census. It was named for the nearby Mosca Pass, which

The Trujillo Homesteads are a historic ranch site near Mosca, Alamosa County, Colorado, not far from the Great Sand Dunes National Park. The area was first settled in the 1860s by Teofilo Trujillo, a