The town of Calhan is a rapidly growing Statutory Town in El Paso County, Colorado, United States. Calhan straddles U.S. Route 24. The population was 896 at the 2000 census. In 2008, the population was estimated to have declined slightly to 869.
Calhan is located at 39°2′7″N 104°17′59″W / 39.03528°N 104.29972°W / 39.03528; -104.29972 (39.035395, -104.299835).
According to the United States Census Bureau, the town has a total area of 1 square miles (1.8 km²), all of it land.