The Statistical Areas of the United States of America and the Commonwealth of Puerto Rico comprise the 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. the 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.
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