There are 72 counties in Wisconsin. In 2019, the most populous county in Wisconsin is Milwaukee County, home of the city of Milwaukee, with 948,201 residents. This represents stagnant growth since the last census with a minor decline of 0.01%. After Milwaukee County, other large counties in Wisconsin include Dane County (542,364), Waukesha County (403,072), and Brown County (263,378). These are the only Wisconsin counties with a population of more than 200,000, although Wisconsin also has 12 counties with a population of 100,000 to 199,000. Of these counties, Dane County experienced the most rapid growth of 10.87%.
Wisconsin is home to five counties with a population below 10,000. The least populous county in Wisconsin is Florence County with 4,321 residents representing a decline of 1.75% since the census. Other small counties in Wisconsin include Menominee County (4,658), Iron County (5,676), Pepin County (7,289), and Forest County (8,991). Of these counties, Menominee County experienced the most growth since the census of 9.11%. Iron County experienced the greatest decline with a growth rate of -4.19%.
Dane County, home of the city of Madison, experienced the most rapid growth in Wisconsin with a growth rate of 10.87% since the 2010 census. Other cities that have reported significant growth include Menominee County (9.11%), St. Croix County (6.26%), Brown County (5.99%), Outagamie County (5.91%), and Eau Claire County (5.57%). The county with the largest decline in population is Price County with a growth rate of -4.97%.