Shelby County's 2026 population is estimated at 20,440, reflecting a -0.25% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Shelby County is the 56th largest county in Illinois. The 2010 population was 22,354 and has grown -8.56% since 2010.
Data after 2023 is projected based on recent change
Overall: 45.3 years
Female: 46.7 years
Male: 44.1 years
There are 16,308 adults, (4,905 of whom are seniors) in Shelby County.
Female: 10,447 (50.4%)
Male: 10,273 (49.6%)
The racial composition of Shelby County includes 96.55% White, and smaller percentages for Two or more races, other race, Native American, Black or African American, Asian and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 20,005 | 96.55% |
| Two or more races | 480 | 2.32% |
| Other race | 87 | 0.42% |
| Native American | 65 | 0.31% |
| Black or African American | 45 | 0.22% |
| Asian | 38 | 0.18% |
Shelby County 's average per capita income is $46,771. Household income levels show a median of $72,095. The poverty rate stands at 9.15%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $98,627 | - |
| Families | $86,663 | $96,724 |
| Households | $72,095 | $82,841 |
| Non Families | $38,158 | $48,534 |
Average Income
Median Household Income
Poverty Rate