In 2018, Polk County, IA had a population of 487k people with a median age of 35.8 and a median household income of $68,291. Between 2017 and 2018 the population of Polk County, IA grew from 481,830 to 487,204, a 1.12% increase and its median household income grew from $65,995 to $68,291, a 3.48% increase.
The 5 largest ethnic groups in Polk County, IA are White (Non-Hispanic) (77.1%), White (Hispanic) (6.83%), Black or African American (Non-Hispanic) (6.47%), Asian (Non-Hispanic) (4.87%), and Two+ (Non-Hispanic) (2.79%). 0% of the people in Polk County, IA speak a non-English language, and 94% are U.S. citizens.
In 2018, the median property value in Polk County, IA was $189,200, and the homeownership rate was 67.8%. Most people in Polk County, IA drove alone to work, and the average commute time was 18.9 minutes. The average car ownership in Polk County, IA was 2 cars per household.