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Metropolitan statistical area

A core based statistical area associated with at least one urbanized area that has a population of at least 50,000. The metropolitan statistical area comprises the central county or counties containing the core, plus adjacent outlying counties having a high degree of social and economic integration with the central county as measured through commuting.

We use the most current definitions available from the Office of Management and Budget (OMB) and carry them through the entire time series.

For more information on how metropolitan areas are defined, see http://www.census.gov/population/www/estimates/metroarea.html.

A list of metropolitan areas and component counties is available.