2024 Urban Influence Codes

The 2024 Urban Influence Codes are a nine-category county classification based initially on the Office of Management and Budget’s (OMB) 2023 three-level classification metropolitan, micropolitan, and noncore counties. Metropolitan (metro) counties are divided into two categories based on the population size of the metro area (greater than or less than 1 million people). Micropolitan (micro) counties are divided into three categories based on their adjacency to metro areas of different sizes (adjacent to a large metro, adjacent to a small metro, and nonadjacent). Finally, noncore nonmetropolitan (nonmetro) counties are divided into four categories based on their adjacency to large and small metro areas and the population size of their largest city or town (greater than or less than 5,000 residents).

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