Polk City is a city located in Polk County Iowa. With a 2020 population of 5,319, it is the 76th largest city in Iowa and the 4599th largest city in the United States . Polk City is currently growing at a rate of 3.48% annually and its population has increased by 55.62% since the most recent census, which recorded a population of 3,418 in 2010. Polk City reached it's highest population of in . Spanning over 5 miles, Polk City has a population density of 1,044 people per square mile.
The average household income in Polk City is $118,644 with a poverty rate of 2.25%. The median rental costs in recent years comes to $1,152 per month, and the median house value is $249,000. The median age in Polk City is 33.9 years, 31.7 years for males, and 35.4 years for females.