Rio is a city of 205 people in Illinois. 14% of adults hold a bachelor's degree, below the 36% national rate. Home values have risen by half since 2000, reaching $115,600. The foreign-born share is 2%. 76% of homes are owner-occupied. Renters pay $775 a month at the median.
At a glance
Lower income
median household income $72,500, below the US median
US median: $82,259
Younger
median age 35.8
US median: 38.9
Less educated
14% hold a bachelor's degree
US average: 36%
More affordable
home values down 5%, inflation adjusted
US median home: $376,019
Unique to this place
What stands out about Rio
What changed most since 1990
Population268 → 205(−24%)US over the same years: +35%
Homes owned by their occupants86.7% → 76.3%(−10.4 pts)US over the same years: +0.9 pts
White share99.3% → 89.8%(−9.5 pts)US over the same years: −17.8 pts
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)27.6%(8)
US avg: 26.4%
Gulf War (1990s)3.4%(1)
US avg: 24.3%
Vietnam era24.1%(7)
US avg: 33.1%
Korean War13.8%(4)
US avg: 4.5%
World War II0%(0)
US avg: 1%
Share of the 29 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
Rio, decade by decade
Rio 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
268
$61,502
$79,202
3.3%
1.9
2000
240
$68,767
$122,051
12.4%
5.1
2010
220
$84,516
$116,956
9.4%
5.6
2020
209
$75,752
$109,084
6.0%
34.4
2024
205
$72,500
$115,600
13.9%
23.6
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.
