St. Croix County's 2026 population is estimated at 99,550, reflecting a 0.81% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). St. Croix County is the 17th largest county in Wisconsin. The 2010 population was 84,399 and has grown 17.95% since 2010.
Data after 2023 is projected based on recent change
Overall: 40.4 years
Female: 41.3 years
Male: 39.4 years
There are 73,194 adults, (15,362 of whom are seniors) in St. Croix County.
Female: 47,566 (49.5%)
Male: 48,467 (50.5%)
The racial composition of St. Croix County includes 92.12% White, and smaller percentages for other race, Asian, Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 88,464 | 92.12% |
| Two or more races | 4,572 | 4.76% |
| Other race | 1,185 | 1.23% |
| Asian | 1,067 | 1.11% |
| Black or African American | 662 | 0.69% |
| Native American | 60 | 0.06% |
| Native Hawaiian or Pacific Islander | 23 | 0.02% |
St. Croix County 's average per capita income is $62,736. Household income levels show a median of $103,046. The poverty rate stands at 6.6%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $137,333 | $161,812 |
| Families | $122,374 | $147,052 |
| Households | $103,046 | $126,955 |
| Non Families | $59,451 | $72,428 |
Average Income
Median Household Income
Poverty Rate
