Urban Influence Codes

The 2013 Urban Influence Codes form a classification scheme that distinguishes metropolitan counties by population size of their metro area, and nonmetropolitan counties by size of the largest city or town and proximity to metro and micropolitan areas. The standard Office of Management and Budget (OMB) metro and nonmetro categories have been subdivided into two metro and 10 nonmetro categories, resulting in a 12-part county classification. This scheme was originally developed in 1993. This scheme allows researchers to break county data into finer residential groups, beyond metro and nonmetro, particularly for the analysis of trends in nonmetro areas that are related to population density and metro influence. 

An update of the Urban Influence Codes is planned for mid-2023.


Data Set Last Updated Next Update
2013 Urban Influence Codes 5/10/2013
2003 and 1993 Urban influence Codes for U.S. counties 4/21/2008
2003 Urban influence Codes for Puerto Rico 10/29/2004