Wisconsin Counties by Population (2025)

There are 72 counties in Wisconsin.

Milwaukee County is the largest county in the state, with a population of 912,459. The most recent census shows that its population has decreased by 0.03% since the previous census.

A number of other Wisconsin counties also boast relatively large populations for their state, though not able to match the density of Milwaukee County:

• Dane County : 590,525
• Waukesha County : 417,227

Wisconsin Counties with the Fewest Residents

The smallest county in Wisconsin is Menominee County, with a population of just 4,266. This total represents a increase of 0.0% since the last census count was performed.

Other small counties include:

• Florence County : 4,634
• Iron County : 6,286
• Pepin County : 7,567

Wisconsin Counties with Rapid Growth

Adams County, with its current population of 21,843, has shown the largest population growth, with an increase of 0.1% since the last census.

Dane County has also had relatively high population growth of 0.05% with 590,525 residents.

On the other hand, Milwaukee County has had the largest decrease in population, with its 912,459 current residents totalling 0.0% less than the previous census.