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 population of Polk County, IA is 77.1% White Alone, 8.53% Hispanic or Latino, and 6.47% Black or African American Alone. N/A% of the people in Polk County, IA speak a non-English language, and 94% are U.S. citizens.
The median property value in Polk County, IA is $189,200, and the homeownership rate is 67.8%. Most people in Polk County, IA commute by Drove Alone, and the average commute time is 18.9 minutes. The average car ownership in Polk County, IA is 2 cars per household.