ERS releases the 2013 Urban Influence Codes

ERS releases the 2013 Urban Influence Codes

The Urban Influence (UI) codes classify all U.S. counties, as well as ?municipios? in Puerto Rico, by size of metropolitan area, adjacency to a metropolitan or micropolitan area, and size of the largest town. These codes are updated every 10 years after the release of new decennial census data and updated metropolitan and micropolitan areas by the Office of Management and Budget (OMB).

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