Broomfield, officially the City and County of Broomfield is a consolidated city and county in the U.S. state of Colorado. Broomfield has a consolidated city and county government which operates under Article XX, Sections 10-13 of the Constitution of the State of Colorado. The population was 55,889 at the 2010 United States Census. Broomfield is the 16th most populous municipality and the 13th most populous county in Colorado.Broomfield is a part of the Denver-Aurora-Lakewood, CO Metropolitan Statistical Area.