The City and County of Broomfield lies in the northwestern tier of the Denver metropolitan area in the State of Colorado of the United States. 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 United States Census Bureau estimates that the population was 45,116 in 2006, a 17.88% increase since U.S. Census 2000. Broomfield is the 16th most populous city and the 16th most populous county in the State of Colorado. Broomfield is a part of the Denver-Aurora Metropolitan Statistical Area and the Denver-Aurora-Boulder Combined Statistical Area.