However, this demographic shift will not affect all 72 counties equally. Milwaukee County, for instance, is projected to lose nearly 10% of its population, while Dane County is poised for a 38% surge.

Milwaukee County has seen by far the steepest population decline of any Wisconsin county in the 2020s. Between April 2020 and July 2023, the county lost 23,266 residents, a 2.5% loss.

Population growth remains slow through much of Wisconsin, but Dane County, home to 575,000 residents, has seen an increase by 18 percent since 2010, and the pace of growth shows no signs of ebbing.

Florence County, Wisconsin, is located in on the far northeast part of the state. According to the report, it is estimated to face over a 31% decline in its population by the 2050s.

According to the report, most Wisconsin counties will face a declining population by 2050. In total, it's a projected loss of nearly 200,000 people in the next three decades.

St. Croix County’s population grew by about 11% between 2010 and 2020 —, from about 84,400 to about 91,800, ... The Wisconsin population projections are based on the 2020 U.S. Census.