Boulder Flag

Boulder

County:
Boulder County
County Seat:
Yes
Area (mi²):
26.894
State:
Colorado

Boulder is a city located in Boulder County, Colorado. Boulder has a 2025 population of 104,414. It is also the county seat of Boulder CountyBoulder is currently declining at a rate of -0.71% annually and its population has decreased by -3.43% since the most recent census, which recorded a population of 108,123 in 2020.

The average household income in Boulder is $140,662 with a poverty rate of 21.8%.The median age in Boulder is 28.8 years: 28.3 years for males, and 29.4 years for females.

104.4K
Total Population
3,882
Density (mi²)
-742 -0.71%
Growth

Boulder Population

Demographics

Economics and Income Statistics

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)