The U.S. State of Colorado has 20 statistical areas that have been delineated by the Office of Management and Budget (OMB). Statistical areas are important geographic delineations of population clusters used by the OMB, the United States Census Bureau, planning organizations, and federal, state, and local government entities.

On July 21, 2023, the OMB delineated three combined statistical areas, seven metropolitan statistical areas, and ten micropolitan statistical areas in Colorado.^[1] The most populous of these statistical areas is the Denver-Aurora-Greeley, CO CSA, with a population of 3,623,560 at the 2020 census.^[2]

The Office of Management and Budget (OMB) has designated more than 1,000 statistical areas for the United States and Puerto Rico.^[3] These statistical areas are important geographic delineations of population clusters used by the OMB, the United States Census Bureau, planning organizations, and federal, state, and local government entities.

Background

The OMB defines a core-based statistical area (commonly referred to as a CBSA) as the county or counties (or county-equivalents) surrounding at least one densely-settled core of at least 10,000 population,^[3] "plus adjacent counties having a high degree of social and economic integration with the core as measured through commuting ties with the counties containing the core".^[3] The OMB further divides core-based statistical areas based on population into metropolitan statistical areas (MSAs) for those with at least 50,000 and micropolitan statistical areas (μSAs) for those with 10,000 to 49,999 people.^[3]

The OMB defines a combined statistical area (CSA) as two or more adjacent core-based statistical areas where the employment interchange rate (% commuting from A to B plus % commuting from B to A) is at least 15%.^[3] The primary statistical areas (PSAs) include all combined statistical areas and any core-based statistical area that is not a constituent of a combined statistical area.

Primary statistical areas (PSAs) include all combined statistical areas and any core-based statistical area that is not a constituent of a combined statistical area. Of the 20 statistical areas of Colorado, 13 are PSAs comprising three combined statistical areas, three metropolitan statistical areas, and seven micropolitan statistical areas.

• Bibliography of Colorado
• Geography of Colorado
• History of Colorado
  • National Register of Historic Places listings in Colorado
• Index of Colorado-related articles
• List of Colorado-related lists
  • List of counties in Colorado
  • List of municipalities in Colorado
• Outline of Colorado