Aspen is the home rule municipality that is the county seat and the most populous municipality of Pitkin County, Colorado, United States. Its population was 6,658 at the 2010 United States Census. Aspen is in a remote area of the Rocky Mountains' Sawatch Range and Elk Mountains, along the Roaring Fork River at an elevation just below 8,000 feet (2,400 m) above sea level on the Western Slope, 11 miles (18 km) west of the Continental Divide.
The city sits along the southeast (upper) end of the Roaring Fork Valley, along the Roaring Fork River, a tributary of the Colorado River about 40 miles (64 km) south of Glenwood Springs, Colorado. It is surrounded by mountain and wilderness areas on three sides: Red Mountain to the north, Smuggler Mountain to the east, and Aspen Mountain to the south.
Aspen is located at 39°11′32″N 106°49′28″W, along State Highway 82. According to the United States Census Bureau, the city has a total area of 3.5 square miles (9.1 km²), all land.
As of the census of 2003, there were 5,914 people, 2,903 households, and 1,082 families residing in the city. The population density was 1,675.4 people per square mile (646.9/km²). There were 4,354 housing units at an average density of 1,233.5 per square mile (476.2 per km²). The racial makeup of the city was 94.94 percent White, 0.44 percent Black or African American, 0.24 percent Native American, 1.45 percent Asian, 0.08 percent Pacific Islander, 1.64 percent from other races, and 1.20 percent from two or more races. Hispanic or Latino of any race were 6.14 percent of the population.
There were 2,903 households, of which 16.5 percent had children under the age of 18 living with them, 28.8 percent were married couples living together, 5.6 percent had a female householder with no husband present, and 62.7 percent were non-families. Single individuals composed 43.8 percent of all households and 4.8 percent had someone living alone who was 65 years of age or older. The average household size was 1.94 and the average family size was 2.67.
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