Iowa Census Data
Data for Iowa show that the five most populous incorporated places and their 2010 Census counts are Des Moines, 203,433; Cedar Rapids, 126,326; Davenport, 99,685; Sioux City, 82,684; and Waterloo, 68,406. Des Moines grew by 2.4 percent since the 2000 Census. Cedar Rapids grew by 4.6 percent, Davenport grew by 1.3 percent, Sioux City decreased by 2.7 percent and Waterloo decreased by 0.5 percent.
The largest county is Polk with a population of 430,640. Its population grew by 15.0 percent since 2000. The other counties in the top five include Linn, with a population of 211,226 (increase of 10.2 percent); Scott, 165,224 (increase of 4.1 percent); Black Hawk, 131,090 (increase of 2.4 percent); and Johnson, 130,882 (increase of 17.9 percent). Read More »