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While Iowa’s population grew 4.7 percent from 2010 to 2020, 68 of the state’s 99 counties lost population, according to the 2020 census.
U.S. Census Bureau data released Thursday shows growth concentrated in and around the urban centers of Polk, Johnson, Linn and Scott counties. The fastest growing county was Dallas, west of Des Moines, with an increase of 50.7 percent (33,543).
» City data: Searchable database of Iowa city population changes
In this map, purple-tinted counties shrunk in population, and orange-tinted counties grew. Hover over counties for details. Below the map is a searchable database with more county details.
Find more county-level details in this database: