Recently released data shows around 18,000 new residents moved to the county between July 2020 and July 2025.

ADEL, Iowa — New U.S. Census Bureau data shows Dallas County is now the fastest‑growing county in the Midwest, adding nearly 18,000 residents over the past five years.

The county, which includes parts of West Des Moines, Waukee, Adel and Perry, had just over 100,000 residents in mid‑2020. The data show that number is now well past 118,000. Waukee accounts for a large share of that increase and has grown into the state’s third‑largest school district.

City leaders, though, say the growth extends far beyond one community. 

“We thrive as a region, right? It’s not just us,” said Heather Behrens with the city of Waukee.

Adel leaders say they’ve seen the same trend. Mayor Tim Crannell said the city has more than doubled its population in the past decade and is working to keep pace with improvements to streets and efforts to attract new businesses. 

“It’s good. It is a good problem,” Crannell said.

Across Dallas County, planning for continued expansion is now a priority. Recently, Waukee installed a new water tower. But Behrens told Local 5 more investment means better quality of life.

“Certainly there are challenges with growth, but there are opportunities too,” Behrens said.

Adel is preparing for additional housing and light industrial development on its south side while also evaluating plans for a business park to the east.

Local leaders pointed to several factors fueling the increase in residents, including diverse housing options, access to parks and trails and well‑maintained infrastructure. In Adel, Mayor Crannell said families are also drawn to a school district that offers a smaller alternative to the larger Des Moines metro systems.

Despite each community experiencing growth differently, officials said collaboration is key. 

“There is a lot that goes into working together to set the path for the future,” Behrens said.

Dallas County narrowly missed ranking among the top 50 fastest‑growing counties nationwide, but officials say the momentum shows no sign of slowing and they’re continuing to plan into the future.