Monroe County's 2026 population is estimated at 34,619, reflecting a -0.5% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Monroe County is the 41st largest county in Illinois. The 2010 population was 33,051 and has grown 4.74% since 2010.
Data after 2023 is projected based on recent change
Overall: 43.2 years
Female: 44.2 years
Male: 42.5 years
There are 27,385 adults, (6,913 of whom are seniors) in Monroe County.
Female: 17,461 (49.8%)
Male: 17,575 (50.2%)
The racial composition of Monroe County includes 96.02% White, and smaller percentages for Two or more races, Asian, Black or African American, other race, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 33,641 | 96.02% |
| Two or more races | 751 | 2.14% |
| Asian | 209 | 0.6% |
| Black or African American | 207 | 0.59% |
| Other race | 194 | 0.55% |
| Native American | 34 | 0.1% |
Monroe County 's average per capita income is $64,693. Household income levels show a median of $102,880. The poverty rate stands at 5.02%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $139,795 | - |
| Families | $128,097 | $147,299 |
| Households | $102,880 | $123,402 |
| Non Families | $48,705 | $57,964 |
Average Income
Median Household Income
Poverty Rate
