A Metropolitan Statistical Area (MSA) is a Core-Based Statistical Area associated with at least one urbanized area with a population of at least 50,000. An MSA comprises the central county or counties containing the core, plus adjacent outlying counties with a high degree of social and economic integration with the central county as measured through commuting.
A Core-Based Statistical Area associated with at least one urban cluster having a population of at least 10,000 but less than 50,000 inhabitants. It includes the central county or counties containing the core, plus adjacent outlying counties highly integrated economically and socially.
