What are the fastest-growing counties in Wisconsin?
Adams County is the fastest-growing county in Wisconsin: its population grew 1.01% a year from 2020 to 2025, to 21,752 residents (Census PEP Vintage 2025). Lafayette County (1.01%) and Dane County (0.97%) follow. Wisconsin as a whole grew 0.25% a year to 5,972,787 residents.
Data as of 2026-09-23. Population, growth and migration: PEP Vintage 2025 · 2020–2025. Income migration: IRS SOI 2022–2023 (2-yr lag).
Top 10 counties in Wisconsin by population growth, 2020 to 2025
| Rank | County | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | Adams County | 21,752 | 1.01% | +1,770 | +206 | +$9.7M |
| 2 | Lafayette County | 17,478 | 1.01% | -23 | +422 | -$1.7M |
| 3 | Dane County | 590,375 | 0.97% | +2,623 | +16,738 | -$97.2M |
| 4 | St. Croix County | 98,276 | 0.92% | +2,949 | +409 | +$54.7M |
| 5 | Sawyer County | 18,846 | 0.79% | +1,209 | +41 | +$20.9M |
| 6 | Burnett County | 17,223 | 0.76% | +1,196 | +17 | +$24.4M |
| 7 | Bayfield County | 16,787 | 0.66% | +888 | +26 | +$13.8M |
| 8 | Pierce County | 43,519 | 0.61% | +1,013 | +70 | +$22.2M |
| 9 | Eau Claire County | 109,033 | 0.59% | +2,112 | +631 | -$0.2M |
| 10 | Ozaukee County | 94,346 | 0.59% | +2,658 | +672 | +$38.6M |
Where are people moving in Wisconsin?
Waukesha County gained the most people from elsewhere in the United States: net domestic migration of +8,010 from 2020 to 2025 (Census PEP Vintage 2025). The table ranks every Wisconsin place with 10,000 or more residents by that figure; the IRS column shows net adjusted gross income migration for 2022 to 2023.
| Rank | County | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | Waukesha County | 417,210 | 0.47% | +8,010 | +3,299 | -$8.9M |
| 2 | St. Croix County | 98,276 | 0.92% | +2,949 | +409 | +$54.7M |
| 3 | Ozaukee County | 94,346 | 0.59% | +2,658 | +672 | +$38.6M |
| 4 | Dane County | 590,375 | 0.97% | +2,623 | +16,738 | -$97.2M |
| 5 | Washington County | 139,238 | 0.35% | +2,511 | +473 | +$5.3M |
| 6 | Eau Claire County | 109,033 | 0.59% | +2,112 | +631 | -$0.2M |
| 7 | Rock County | 166,472 | 0.33% | +2,021 | +777 | -$3.1M |
| 8 | Outagamie County | 195,894 | 0.51% | +1,928 | +1,404 | -$24.4M |
| 9 | Vilas County | 23,761 | 0.57% | +1,773 | -9 | +$30.8M |
| 10 | Adams County | 21,752 | 1.01% | +1,770 | +206 | +$9.7M |
Go past the headline numbers
The interactive Demographics map layer and the full report for a single place are part of paid plans.
Get the Demographics Report for Adams CountyFrequently asked questions
- What are the fastest-growing counties in Wisconsin?
- By population growth from 2020 to 2025, the fastest are Adams County (1.01% a year), Lafayette County (1.01% a year), Dane County (0.97% a year), St. Croix County (0.92% a year) and Sawyer County (0.79% a year) (Census PEP Vintage 2025). Only places with 10,000 or more residents are ranked.
- Where are people moving in Wisconsin?
- By net domestic migration from 2020 to 2025, the largest gains are Waukesha County (+8,010), St. Croix County (+2,949) and Ozaukee County (+2,658) (Census PEP Vintage 2025).
- How fast is Wisconsin growing overall?
- Wisconsin grew 0.25% a year from 2020 to 2025, to 5,972,787 residents, with net migration of +77,047 people (Census PEP Vintage 2025).
- Where does this Wisconsin data come from, and how current is it?
- Population, growth and migration come from the U.S. Census Bureau Population Estimates Program (PEP Vintage 2025 · 2020–2025). Income migration comes from IRS Statistics of Income (IRS SOI 2022–2023 (2-yr lag)). Counties with fewer than 10,000 residents are not ranked (5 of 72 in Wisconsin). Data last loaded 2026-09-23.
Data as of 2026-09-23: sources and periods
- Population, growth and migration
- U.S. Census Bureau, Population Estimates Program: PEP Vintage 2025 · 2020–2025. census.gov/programs-surveys/popest
- Income migration (net AGI)
- Internal Revenue Service, Statistics of Income migration data: IRS SOI 2022–2023 (2-yr lag). irs.gov/statistics/soi-tax-stats-migration-data
How to read the table
- Population is the Census July 1 estimate of the latest vintage.
- Growth is the compound annual rate over 2020 to 2025.
- Net domestic and international migration are cumulative people over 2020 to 2025.
- IRS net AGI migration is adjusted gross income that moved in, less what moved out, for 2022 to 2023. A plus sign means a net inflow.
- Places with fewer than 10,000 residents are left out of the rankings.