The United States Office of Management and Budget (OMB) has defined 935 core-based statistical areas (CBSAs) for the United States and 10 for Puerto Rico. The OMB defines a core-based statistical area as one or more adjacent counties or county equivalents that have at least one urban core area of at least 10,000 population, plus adjacent territory that has a high degree of social and economic integration with the core as measured by commuting ties. The 935 core-based statistical areas currently defined by the OMB include the 393 metropolitan statistical areas (MSAs),The United States Office of Management and Budget (OMB) defines a metropolitan statistical area (MSA) as a core-based statistical area having at least one urbanized area of 50,000 or more population, plus adjacent territory that has a high degree of social and economic integration with the core as measured by commuting ties. which have an urban core population of at least 50,000, and the 542 micropolitan statistical areas (μSAs),The United States Office of Management and Budget (OMB) defines a micropolitan statistical area (μSA) as a core-based statistical area having at least one urban cluster of at least 10,000 but less than 50,000 population, plus adjacent territory that has a high degree of social and economic integration with the core as measured by commuting ties. which have an urban core population of at least 10,000 but less than 50,000. __TOC__

United States

The following sortable table lists the 925 core-based statistical areas (CBSAs) of the United States with the following information: The CBSA rank by population as of July 1, 2025, as estimated by the United States Census Bureau The CBSA name as designated by the United States Office of Management and Budget The CBSA population as of July 1, 2025, as estimated by the United States Census Bureau The CBSA population as of April 1, 2020, as enumerated by the 2020 United States census The percent CBSA population change from April 1, 2020, to July 1, 2025 The Combined statistical area (CSA)The United States Office of Management and Budget (OMB) defines a CSA (CSA) as an aggregate of adjacent core-based statistical areas that are linked by commuting ties. if the CBSA is a component