Piatt County's 2026 population is estimated at 16,444, reflecting a -0.56% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Piatt County is the 63rd largest county in Illinois. The 2010 population was 16,710 and has grown -1.59% since 2010.
Data after 2023 is projected based on recent change
Overall: 42.8 years
Female: 44.6 years
Male: 41.7 years
There are 13,087 adults, (3,529 of whom are seniors) in Piatt County.
Female: 8,366 (50.1%)
Male: 8,329 (49.9%)
The racial composition of Piatt County includes 95% White, and smaller percentages for Two or more races, Black or African American, other race, Asian, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 15,860 | 95% |
| Two or more races | 350 | 2.1% |
| Black or African American | 240 | 1.44% |
| Other race | 125 | 0.75% |
| Asian | 106 | 0.63% |
| Native American | 14 | 0.08% |
Piatt County 's average per capita income is $56,016. Household income levels show a median of $94,811. The poverty rate stands at 6.14%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $115,723 | - |
| Families | $105,216 | $131,109 |
| Households | $94,811 | $113,102 |
| Non Families | $57,264 | $63,532 |
Average Income
Median Household Income
Poverty Rate