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is a Home Rule Municipality that is the county seat and most populous city of Boulder County, Colorado, in the United States. Boulder is the 11th most populous city in the state of Colorado. The United States Census Bureau estimates that in 2005 the population of the city of Boulder was 91,685, while the population of the Boulder Metropolitan Statistical Area was 280,440. Boulder is the home of the main campus of the University of Colorado, the state's largest university, and Naropa University, one of two accredited Buddhist-inspired universities in the United States. Located in the foothills of the Rocky Mountains at an elevation of , Boulder is northwest of Denver.
As of the census of 2000, there are 94,673 people, 39,596 households, and 16,788 families residing in the city. The population density is 1,499.9/km² (3,884.1/sq mi), making Boulder's population density higher than Denver's and among the highest in the state; of Colorado's twenty-one largest cities, only Englewood and Northglenn (two close-in Denver suburbs) have greater population densities. There are 40,726 housing units at an average density of 1,670.8/sq mi (645.2/km²). The racial makeup of the city is 88.33% White, 1.22% 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. 8.9% of the population are Hispanic or Latino/Latina of any race.
There are 39,596 households out of which 20.0% have children under the age of 18 living with them, 33.3% are married couples living together, 6.5% have a female householder with no husband present, and 57.6% are non-families. 33.7% 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.
Boulder's population is younger than the national average, largely due to the presence of university students. The median age is 29 years compared to the U.S. median of 35.1 years. In Boulder, 14.8% 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.
According to a 2007 estimate, the median household income in Boulder is $50,209, and the median family income is $85,807. Males have a median income of $41,829 versus $32,100 for females. The per capita income for the city is $31,539. 17.4% of the population and 6.4% of families are below the poverty line. Out of the total population, 10.4% of those under the age of 18 and 6.5% of those 65 and older are living below the poverty line. The higher population poverty line is due to the large number of college students living in the area.
Boulder housing tends to be priced higher than surrounding areas. For the 2nd quarter of 2006, the median single family home in Boulder sold for $548,000 and the median attached dwelling (condo or town home) sold for $262,000. According to that National Association of Realtors, during the same period the median value of single family homes nationwide was $227,500.