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Dallas County is a county located in the U.S. state of Iowa. As of the 2020 census, its population was 99,678, and was estimated to be 118,457 in 2025. making it the sixth-most populous county in Iowa. Between 2010 and 2020, it was the fastest growing county in Iowa and one of the fastest growing in the country. The county seat is Adel and the largest city is Waukee. The county was named for George M. Dallas, Vice President of the United States under James K. Polk, the namesake of neighboring Polk County.
Description adapted from Wikipedia, CC BY-SA 4.0.
The land that now forms Dallas County was ceded by the Sac and Fox nation to the United States in a treaty signed on October 11, 1842. White settlement in Dallas County began afterwards, many of the settlers were of Yankee descent. On January 13, 1846, the legislative body of the Iowa Territory authorized the creation of twelve counties in the Iowa Territory, with general descriptions of their boundaries. Dallas County's name referred to United States Vice President George M. Dallas, who served from 1845 to 1849. In 1847 the county residents voted to designate Penoch as the county seat (the name was changed to Adel in 1849). The county's population grew rapidly, with settlers coming to claim homesteads. By 1870, the population had crossed the 12,000 mark.
Adapted from Wikipedia, CC BY-SA 4.0.
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