Cañon City /ˈkænjən ˈsɪti/ is a Home Rule Municipality that is the county seat and the most populous municipality of Fremont County, Colorado, United States. The city population was 16,400 at the 2010 United States Census. Cañon City straddles the easterly flowing Arkansas River and is a popular tourist destination for sightseeing, whitewater rafting, and rock climbing. The city is noted for being the location of nine state and four federal prisons and penitentiaries, and a welcoming sign says, "Corrections Capital of the World."
In 1994, the United States Board on Geographic Names approved adding the tilde to the official name of Cañon City, a change from Canon City as the official name in its decisions of 1906 and 1975. It is one of the few U.S. cities to have an eñe in its name, others being La Cañada Flintridge, California; Española, New Mexico; Peñasco, New Mexico and Cañones, New Mexico.(Wikipedia)