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All Polk County population data above are from the US Census Bureau.
The population data for Polk County are from the Census' American Community Survey 2016 5-year estimates and the Census' 2017 Population Estimates. The demographic data for Benton County, Grundy County, Linn County, and Scott County are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2016 5-year estimates, and were downloaded on 6 December 2018. Check out our FAQ section for more details.
With 481,830 people, Polk County is the 1st most populated county in the state of Iowa out of 99 counties. But watch out, Polk County, because Linn County with 224,115 people and Scott County with 172,509 people are right behind you.
The largest Polk County racial/ethnic groups are White (79.1%) followed by Hispanic (8.0%) and Black (6.2%).
In 2016, the median household income of Polk County residents was $61,684. Polk County households made slightly more than Benton County households ($61,222) and Grundy County households ($61,606) . However, 12.4% of Polk County residents live in poverty.
The median age for Polk County residents is 35.0 years young.
86% of people CANNOT find the data they're looking for on the US Census Bureau website. Source: Nielsen Norman Group
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