Cañon City (//) 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 known for its many public parks, fossil discoveries, Skyline Drive, The Royal Gorge railroad, the Royal Gorge, and extensive natural hiking paths.
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 the Spanish Ñ in its name, others being La Cañada Flintridge, California; Española, New Mexico; Peñasco, New Mexico; and Cañones, New Mexico.
Cañon City was laid out on January 17, 1858, during the Pike's Peak Gold Rush, but then the land was left idle. A new company "jumped the claim" to the town's site in late 1859, and it put up the first building in February 1860. This town was originally intended as a commercial center for mining in South Park and the upper Arkansas River.
In 1861, the town raised two companies of volunteers to serve with the Second Colorado Infantry during the American Civil War. This regiment fought in skirmishes in nearby New Mexico and as far east as the Indian Territory (Oklahoma) and Missouri before ending its organization in 1865.
In 1862, A. M. Cassaday drilled for petroleum 6 miles (10 km) north of Cañon City, close to a known oil seep. Cassaday struck oil at the depth of 50 feet (15 m), and he completed the first commercial oil well west of the Mississippi River. He drilled five or six more wells nearby, and he refined kerosene and fuel oil from the petroleum. Cassaday sold the products in Denver.
Cañon City is located in eastern Fremont County at  at an altitude of 5,332 feet (1,625 m). It sits primarily on the north side of the Arkansas River, just east of where the river exits from Royal Gorge. It is bordered to the south by the unincorporated community of Lincoln Park. Via U.S. Route 50, Pueblo is 39 miles (63 km) to the east and Poncha Springs is 62 miles (100 km) to the west. Colorado Springs is 45 miles (72 km) to the northeast.(38.446800, -105.228305)
According to the United States Census Bureau, the city has a total area of 12.5 square miles (32.4 km2), of which 0.01 square miles (0.03 km2), or 0.09%, is water. Cañon City sits in the "high desert" land of southern Colorado, the same desert lands of Pueblo and Florence.
The city's nickname, "the Climate Capital of Colorado", derives from the combination of unique geography and 5,300-foot (1,600 m) elevation protecting the city from harsh weather conditions. The average daily high temperature in January is 14 °F (7.8 °C) warmer in Cañon City than in Grand Junction, even though the elevation of Cañon City is higher.
A fictional version of the city is depicted in Philip K. Dick's alternate history novel The Man in the High Castle (1963) and its eponymous 2015 television series adaptation. Cañon City is located in an ostensibly demilitarized "neutral zone" situated between the puppet regimes of the Japanese Pacific States, in the west, and Greater Nazi Reich, in the east, in the former United States.
In the Japanese manga series, JoJo's Bizarre Adventure, a turn-of-the-century race across the United States from San Diego to New York City takes place as the main story of the story's seventh part, Steel Ball Run. Cañon City (spelled Canon City) is featured as the third stage finish line and checkpoint for the racers.