Boulder’s population is diverse, and consists of about 100,000 people with almost 300,000 people in the greater metro area.

As of the 2000 census, Boulder’s population density was 3,884.1/sq mi, which was higher than Denver’s population density. The racial makeup of the city was 88.3% White, 1.2% Black or African American, 0.48% Native American, 4.02% Asian, 0.05% Pacific Islander, 3.50% from other races, and 2.40% from two or more races. Almost nine percent of the population was Hispanic or Latino of any race as of 2000.

Twenty percent of Boulder’s households contain children under the age of 18, 33.3% are married couples living together, 6.5% have a female householder with no husband present, and 57.6% are non-families. Thirty-three percent of all households are made up of individuals and 6.2% have someone living alone who is 65 years of age or older. The average household size is 2.20 and the average family size is 2.84.

Due to the presence of CU-Boulder, the city’s population is younger than the national average. The median age is 29 years compared to the national median age of 35.1 years. Fourteen point eight percent of the residents are under the age of 18, 25.9% from 18 to 24, 33.0% from 25 to 44, 18.4% from 45 to 64, and 7.8% are 65 years of age or older. For every 100 females there are 106.8 males. For every 100 females age 18 and older, there are 107.4 males.

Based on an estimate from 2007, the median household income in Boulder is $50,209, and the median family income is $85,807. The median home price in Boulder is currently around $366,000.

Boulder is home to more than 23 colleges and professional schools, more than 1300 restaurants, 26 libraries, 67 public golf courses, seven museums and six movie theatres.