Thornton is a home rule municipality in Adams and Weld counties in the U.S. state of Colorado, located in the northeast quadrant of the Denver-Aurora-Broomfield, CO Metropolitan Statistical Area. Thornton is 10 miles (16 km) north/northeast of downtown Denver. The United States Census Bureau reported the city’s growing population at 118,772 on April 1, 2010, a 44.2% increase from the 2000 Census population of 82,384. Thornton is the sixth-most populous city in the state of Colorado and the 213th-most populous city in the United States.
Thornton is located at 39°54′11″N 104°57′16″W / 39.90306°N 104.95444°W / 39.90306; -104.95444 (39.903043, -104.954406).
According to the United States Census Bureau, the city has a total area of 27.2 square miles (70 km), of which, 26.9 square miles (70 km) is land and 0.3 square miles (0.78 km) (1.25%) is water.
As of the 2010 census, there were 118,772 people, 41,359 households, and 30,254 families residing in the city. The population density was 3,409.1 people per square mile (1,316.8/km²). There were 43,230 housing units at an average density of 1,240.8 per square mile (479.3/km²). The racial makeup of the city was 77.4% White, 4.4% Asian, 1.8% African American, 1.1% American Indian, 0.1% Pacific Islander, 11.4% from other races, and 3.8% from two or more races. Hispanics and Latinos of any race were 31.7% of the population.
There were 41,359 households out of which 43.9% had children under the age of 18 living with them, 54.7% were married couples living together, 6.2% had a male householder with no wife present, 12.2% had a female householder with no husband present, and 26.9% were non-families. 20.1% of all households were made up of individuals, and 4.2% had someone living alone who was 65 years of age or older. The average household size was 2.86, and the average family size was 3.32.
The distribution of the population by age was 29.5% under the age of 18, 9.1% from 18 to 24, 32.6% from 25 to 44, 22.3% from 45 to 64, and 6.5% who were 65 years of age or older. The median age was 32.0 years. The gender makeup of the city was 49.5% male and 50.5% female.
The median income for a household in the city was $65,578, and the median income for a family was $74,233. Males had a median income of $49,154 versus $39,596 for females. The city’s per capita income was $26,100. About 7.8% of families and 9.9% of the population were below the poverty line, including 14.1% of those under age 18 and 7.4% of those age 65 or over.