OMB County Classifications

July 2016

This map shows the county classifications based on the Office of Management and Budget (OMB), which classifies metropolitan counties (“urban”) and nonmetropolitan counties (“rural”). Nonmetropolitan (rural) counties can be further split into two categories: micropolitan and noncore counties.


This map of the United States shows counties classified as metropolitan, micropolitan, and noncore.

Map of metropolitan, micropolitan, and noncore counties across America. This map of the United States depicts urban and rural counties across America using the Office of Management and Budget classifications. In general, metropolitan counties are more prevalent along both the Atlantic and Pacific coasts, and throughout the eastern and Midwestern states. Micropolitan and noncore counties are more common in the northeast, parts of northern Midwest, the Great Plains, and Rocky Mountains.



This work is part of the Geography of Disability Project.