The official U.S. Census is only taken every 10 years, so estimates like these are “ballpark figures” determined by “symptomatic indicators of population change,” including births, deaths, and domestic and international migration, said David Egan-Robertson, a demographer with the University of Wisconsin’s Applied Population Laboratory. Still, they’re likely to closely reflect reality.
The new estimates reveal that, in the 2020s, some Wisconsin counties have seen significant population growth while others have seen steep declines.