St. Croix County's estimated 2026 population is 98,898 with a growth rate of 0.63% in the past year according to the most recent United States census data. St. Croix County is the 17th largest county in Wisconsin. The 2010 population was 84,399 and has seen a growth of 17.18% since that time.
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
