Superior is a Statutory Town in Boulder County in the U.S. state of Colorado, with a small, uninhabited segment of land area extending into Jefferson County . According to the 2010 census, the population of the city was 12,483.
Superior is located at 39°56′N 105°10′W / 39.933°N 105.167°W / 39.933; -105.167 (39.931190, −105.159085).
According to the United States Census Bureau, the town has a total area of 4.0 square miles (10.3 km²), of which, 4.0 square miles (10.2 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.50%) is water.
As of the census of 2010, there were 12,483 people, 4,484 households (for 2007-2011), and 3,159 families residing in the town. The population density was 3,120.8 people per square mile (1,223.8/km²). There were 4,698 housing units at an average density of 1,186.4 per square mile (458.1/km²). The racial makeup of the town was 80.4% White, 0.9% African American, 0.2% Native American, 13.8% Asian, less than 0.1% Pacific Islander, 1.00% from other races, and 3.7% from two or more races. Hispanic or Latino of any race were 6.6% of the population.
Of all households, 46.6% had children under the age of 18 living with them, 57.9% were married couples living together, 8.1% had a female householder with no husband present, and 29.7% were non-families. 20.0% of all households were individuals living alone and 1.6% had someone living alone who was 65 years of age or older. The average household size was 2.71 and the average family size was 3.31.
In the town, the population was spread out with 31.5% under the age of 18, 12.9% from 18 to 24, 33.4% from 25 to 44, 24.1% from 45 to 64, and 3.1% who were 65 years of age or older. The median age was 32.5 years. For every 100 females, there were 103.0 males. For every 100 females age 18 and over, there were 101.1 males.
The median income for a household in the town was $100,194, and the median income for a family was $119,115. The per capita income for the town was $44,318 (for 2007-2011). About 1.4% of families and 4.3% of the population were below the poverty line, including 3.1% of those under age 18 and none of those age 65 or over.
Of residents 25 years and over, 97.5% were high school graduates and 71.8% held a bachelor’s degree or higher, with 26.8% holding graduate or professional degrees.