Lafayette County's 2026 population is estimated at 17,800, reflecting a 1.41% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Lafayette County is the 57th largest county in Wisconsin. The 2010 population was 16,799 and has grown 5.96% since 2010.
Data after 2023 is projected based on recent change
Overall: 40.8 years
Female: 41.5 years
Male: 40.1 years
There are 12,661 adults, (3,450 of whom are seniors) in Lafayette County.
Female: 8,322 (49.1%)
Male: 8,620 (50.9%)
The racial composition of Lafayette County includes 91.03% White, and smaller percentages for other race, Asian, Black or African American, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 15,422 | 91.03% |
| Two or more races | 970 | 5.73% |
| Other race | 345 | 2.04% |
| Asian | 123 | 0.73% |
| Black or African American | 62 | 0.37% |
| Native American | 20 | 0.12% |
Lafayette County 's average per capita income is $50,738. Household income levels show a median of $76,462. The poverty rate stands at 11.89%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $101,345 | $116,870 |
| Families | $91,810 | $106,456 |
| Households | $76,462 | $92,228 |
| Non Families | $42,157 | $59,873 |
Average Income
Median Household Income
Poverty Rate