"This report examines subnational demographic variation through the ens of metropolitan and micropolitan statistical areas. Metro areas and micro areas, as they are coloquially known, are useful geographic units for analyzing the U.S. population. States are sometimes too large a unit to provide meaningful subnational analysis, obscuring patterns worthy of attention from regional or even national perspective. Counties, on the other hand, number more than 3,000 and can be too small and numerous for some purposes. Metro and micro areas, as socially and economically integrated groupings of one or more counties, provide appropriately detailed geographic analysis as well as good mapping units for a national overview..."
Pattens of Metropolitan and Micropolitan Population Change: 2000 to 2010.
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