Parker is a home rule municipality in Douglas County, Colorado, United States. As a self-declared “Town” under the Home Rule statutes, Parker is the second most populous town in the county; Castle Rock is the most populous. In recent years, Parker has become a commuter town at the southeasternmost corner of the Denver Metropolitan Area. As of the 2010 census the town population was 45,297; the estimated population in 2014 was 49,857. Parker is now the 19th most populous municipality in the state of Colorado.
Parker is located in northeastern Douglas County at 39°31′10″N 104°45′57″W (39.519488, −104.765833). Its northernmost border follows the Arapahoe County line, and the city of Aurora touches the town’s northeast border. The center of Parker is 23 miles (37 km) southeast of downtown Denver. Castle Rock, the Douglas County seat, is 15 miles (24 km) to the southwest. Unincorporated communities that border Parker are Dove Valley to the northwest, Stonegate to the west, and The Pinery to the south.
According to the United States Census Bureau, the town has a total area of 20.5 square miles (53.1 km2), of which 0.02 square miles (0.04 km2), or 0.08%, is water. Cherry Creek flows through Parker on its way north toward Denver.
As of the census of 2000, there were 23,558 people, 7,929 households, and 6,525 families residing in the town. The population density was 1,615.2 people per square mile (623.4/km²). There were 8,352 housing units at an average density of 572.6 per square mile (221.0/km²). The racial makeup of the town was 92.60% White, 1.71% Asian, 1.01% Black, 0.45% Native American, 0.03% Pacific Islander, 1.88% from other races, and 2.33% from two or more races. Hispanic or Latino of any race were 5.80% of the population.
There were 7,929 households out of which 52.5% had children under the age of 18 living with them, 71.8% were married couples living together, 8.0% had a female householder with no husband present, and 17.7% were non-families. 13.0% of all households were made up of individuals and 1.4% had someone living alone who was 65 years of age or older. The average household size was 2.96 and the average family size was 3.27.
In the town, the population was spread out with 34.0% under the age of 18, 4.9% from 18 to 24, 43.4% from 25 to 44, 15.0% from 45 to 64, and 2.7% who were 65 years of age or older. The median age was 31 years. For every 100 females there were 98.0 males. For every 100 females age 18 and over, there were 94.3 males.