With 35,036 people, Monroe County is a county in Illinois. Owners hold 85% of the housing stock. That puts it in the top 1% of US counties for household income. 1% of people here were born outside the United States. The median age is 43.2, about 4 years above the US median. The population is up 27% since 2000.
At a glance
Wealthier
median household income $102,880, above the US median
US median: $82,259
Older
median age 43.2
US median: 38.9
Average education
39% hold a bachelor's degree
US average: 36%
Stable housing
home values roughly flat, inflation adjusted
US median home: $376,019
Unique to this place
What stands out about Monroe County
What changed most since 1990
White share98.6% → 95.0%(−3.6 pts)US over the same years: −17.8 pts
Adults with a bachelor's degree13.7% → 38.7%(+24.9 pts)US over the same years: +15.3 pts
Median age34.0 → 43.2(+9.2 years)US over the same years: +6.0 years
Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.
Section 09 · Service history
Veterans
Veterans by period of service, 2024
Gulf War (2001 or later)21.3%(505)
US avg: 26.4%
Gulf War (1990s)27.3%(647)
US avg: 24.3%
Vietnam era37.3%(884)
US avg: 33.1%
Korean War3.3%(79)
US avg: 4.5%
World War II2.3%(54)
US avg: 1%
Share of the 2,373 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Over time
Monroe County, decade by decade
Monroe County population, inflation-adjusted income and home value, education, and diversity by year
Year
Population
Median household income
Median home value
Bachelor's degree+
Diversity score
1990
22,422
$84,209
$169,685
13.7%
3.3
2000
27,619
$100,774
$229,346
20.4%
4.1
2010
32,957
$98,187
$283,974
24.7%
7.2
2020
34,962
$108,657
$267,376
36.6%
15.7
2024
35,036
$102,880
$282,100
38.7%
12.0
Census years come from the decennial census and the latest year from the American Community Survey, so part of any change between those two rows can reflect the different surveys. Dollar figures are adjusted for inflation to 2024 dollars; a figure ending in "+" was at the Census Bureau's reporting cap that year. The diversity score runs from 0 to 100; see how it's calculated.
