Boulder, Colorado

Boulder is a home rule city and the county seat of Boulder County, Colorado, United States. It is the largest city in Boulder County, with a population of 108,250 at the 2020 United States census, making it the 12th-most populous city in Colorado. Boulder is the principal city of the Boulder, CO Metropolitan Statistical Area and part of the Front Range Urban Corridor.

Boulder
Pearl Street Mall in downtown Boulder
Location of Boulder in Boulder County, Colorado
Boulder
Location of Boulder in the United States
Boulder
Boulder (the United States)
Coordinates: 40°00′54″N 105°16′14″W
CountryUnited States
StateColorado
CountyBoulder
Settled1858 as Boulder City, N.T.
Incorporated1871-11-04
Government
  TypeHome rule municipality
  MayorAaron Brockett (D)
  Mayor Pro TemNicole Speer
Area
  Total27.366 sq mi (70.877 km2)
  Land26.328 sq mi (68.188 km2)
  Water1.038 sq mi (2.689 km2)
Elevation
5,318 ft (1,621 m)
Population
 (2020)
  Total108,250
  Rank12th in Colorado
289th in United States
  Density4,112/sq mi (1,588/km2)
  Metro
330,758 (155th)
  CSA
3,623,560 (17th)
  Front Range
5,055,344
DemonymBoulderite
Time zoneUTC–07:00 (MST)
  Summer (DST)UTC–06:00 (MDT)
ZIP Codes
80301-80310, 80314, 80321-80323, 80328, 80329
Area codes303 and 720
FIPS code08-07850
GNIS feature ID178680
Websitebouldercolorado.gov

Boulder is located at the base of the foothills of the Rocky Mountains, at an elevation of 5,430 feet (1,655 m) above sea level. The city is 25 miles (40 km) northwest of the Colorado state capital of Denver. Boulder is a college town, hosting the largest campus of the University of Colorado (the state's largest university) and more than 20 research institutes.

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