Population density (sq mi)4,0125691
Median age28.736.437.7
Male/Female ratio1.1:11.0:11.0:1
Married (15yrs & older)36%56%55%
Families w/ Kids under 1844%45%43%
Speak English85%83%79%
Speak Spanish7%12%13%

Key findings

  • The population density in Boulder is 7065% higher than Colorado
  • The median age in Boulder is 21% lower than Colorado
  • In Boulder 88.06% of the population is White
  • In Boulder 1.14% of the population is Black
  • In Boulder 5.30% of the population is Asian

Compare Boulder, CO Demographics


      Boulder population breakdown by race

      American Indian0.29%0.94%0.82%
      Native Hawaiian0.09%0.14%0.18%
      Mixed race3.16%3.43%3.06%
      Other race1.96%4.18%4.75%
      In Boulder, 9.2% of people are of Hispanic or Latino origin.
      Please note: Hispanics may be of any race, so also are included in any/all of the applicable race categories above.

      Household income distribution

      Place of birth by citizenship

      Boulder age breakdown

      Marital status

      Age of children in married couples

      Source: The Boulder, CO demographics data displayed above is derived from the 2016 United States Census Bureau American Community Survey (ACS).