List of core-based statistical areas

The United States Office of Management and Budget (OMB) has defined 925 core-based statistical areas (CBSAs) for the United States and 10 for Puerto Rico.^[1] 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),^[2] which have an urban core population of at least 50,000, and the 542 micropolitan statistical areas (μSAs),^[3] which have an urban core population of at least 10,000 but less than 50,000.

^ "OMB Bulletin No. 23-01: Revised Delineations of Metropolitan Statistical Areas, Micropolitan Statistical Areas, and Combined Statistical Areas, and Guidance on Uses of the Delineations of These Areas" (PDF). United States Office of Management and Budget. July 21, 2023. Retrieved March 28, 2024.
^ 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.
^ 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.