Illinois City, IL Demographics

Population 871 · Census ACS 2020–24

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Illinois City, IL map of median age by neighborhood
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Population and households in Illinois City

Household size in Illinois City

Household size, people per household
PeriodIllinois CityIllinoisU.S.
2006–102.362.692.68
2010–142.542.712.73
2015–192.542.662.71
2020–242.232.582.65
Change−0.13−0.11−0.03
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Households in Illinois City are small: just 2.23 people on average, compared with 2.65 nationally. That is typical of places where many people live alone or as couples, and fewer have children at home. Household size has dropped from 2.36 in 2006–10, but in a place this small, survey estimates can swing a lot from one release to the next.

Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).

Median age in Illinois City

Median age, years
PeriodIllinois CityIllinoisU.S.
2006–1041.937.637.7
2010–1448.538.538.6
2015–1944.539.639.6
2020–2454.340.240.1
Change+12.4+2.6+2.3
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Illinois City skews older: half of its residents are older than 54.3, well above the national median of 40.1. That usually means more empty nesters and retirees, and fewer young families.

Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).

Single-parent households in Illinois City

Single-parent households, % of households
PeriodIllinois CityIllinoisU.S.
2006–107.4%11.7%12.3%
2010–1410.1%11.7%12.3%
2015–197.1%11.1%11.6%
2020–247.9%11.3%11.6%
Change+0.5 pts−0.4 pts−0.6 pts
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Single-parent households are relatively rare in Illinois City: 7.9% of households, against 11.6% nationally.

Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).

Housing in Illinois City

Renters in Illinois City

Renters, % of occupied homes
PeriodIllinois CityIllinoisU.S.
2006–1018.6%30.8%33.3%
2010–1423.1%33.1%35.6%
2015–1913.8%33.9%36.0%
2020–2411.1%32.9%34.8%
Change−7.5 pts+2.1 pts+1.5 pts
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Illinois City is overwhelmingly a place of homeowners: only 11.1% of households rent, far below the national share of 34.8%. Owner-heavy areas like this tend to see less turnover. More than four in ten owners (43.0%) have paid off their mortgages, above the national share of 39.8%.

Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).

Vacant homes in Illinois City

Vacant homes, % of all homes
PeriodIllinois CityIllinoisU.S.
2006–104.3%10.0%11.4%
2010–145.6%10.1%11.4%
2015–1921.4%9.8%11.1%
2020–2411.8%8.1%9.6%
Change+7.5 pts−1.9 pts−1.8 pts
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A few more homes sit empty in Illinois City than nationally: 11.8%, against 9.6%. The count includes vacation homes and homes between owners or tenants, not just abandoned ones.

Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).

Age of homes in Illinois City

Age of homes, median year built
PeriodIllinois CityIllinoisU.S.
2006–10196819661974
2010–14196019671975
2015–19195419681977
2020–24195319701980
Change−16+4+6
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Illinois City is a place of older homes: half were built before 1953, while the national median is 1980. That means established neighborhoods, and more houses that may need updating.

Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).

Rent in Illinois City

Rent, per month
PeriodIllinois CityIllinoisU.S.
2006–10$404$953$965
2010–14$659$1,028$1,040
2015–19$1,021$1,165$1,213
2020–24$872$1,428$1,571
Change+$468+$475+$606
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A typical rental in Illinois City costs $872 a month with utilities, well below the national median of $1,571. The typical renter here spends 14.6% of household income on rent, comfortably under the 30% mark often used to define affordable rent, and a smaller share than renters pay nationally.

Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).

Education in Illinois City

Bachelor's degrees in Illinois City

Bachelor's degrees, % of adults 25+
PeriodIllinois CityIllinoisU.S.
2006–1026.4%31.2%28.4%
2010–1428.1%32.4%29.6%
2015–1926.5%34.7%32.1%
2020–2423.2%37.7%35.6%
Change−3.2 pts+6.5 pts+7.2 pts
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Fewer adults in Illinois City have a four-year degree than in the country as a whole: 23.2%, against 35.6% nationally.

Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).

High school graduates in Illinois City

High school graduates, % of adults 25+
PeriodIllinois CityIllinoisU.S.
2006–1097.7%86.3%84.9%
2010–1498.6%87.5%86.1%
2015–1993.3%89.1%87.7%
2020–2496.8%90.3%89.3%
Change−0.9 pts+4.0 pts+4.3 pts
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High school completion is high in Illinois City: 96.8% of adults 25 and older have a diploma or equivalent, well above the national rate of 89.3%.

High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).

Jobs in Illinois City

Unemployment, % of the labor force
PeriodIllinois CityIllinoisU.S.
2006–104.4%8.7%8.1%
2010–149.7%10.2%9.4%
2015–193.8%6.1%5.6%
2020–241.3%6.0%5.4%
Change−3.1 pts−2.7 pts−2.7 pts
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Unemployment in Illinois City has been low: just 1.3% of the labor force was out of work and looking, well below the national rate of 5.4%. Each figure pools five years of surveys (2020–24), so it describes that whole stretch rather than today's job market.

Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).

Illinois City compared with nearby cities

CityHousehold sizeMedian ageSingle parentsRentersVacant homesMedian year builtMedian rentBachelor's degreeHigh school diplomaUnemployment
Illinois City2.2354.37.9%11.1%11.8%1953$87223.2%96.8%1.3%
Buffalo Prairie2.4045.17.6%12.5%7.4%1970$78525.7%96.6%0.1%
New Era2.0558.66.2%6.5%7.2%1972$1,33242.1%92.5%3.3%
Muscatine2.4438.814.0%29.9%9.2%1965$1,00623.7%90.0%3.4%
Sweetland Center2.7743.411.9%10.8%11.9%1981$1,17716.3%84.2%0.9%
Montpelier1.9657.96.9%9.0%3.3%1973$1,34241.1%93.9%3.9%
Pleasant Prairie2.4943.222.9%24.3%2.9%1959$74813.8%91.7%0.9%
Taylor Ridge2.4640.710.6%10.1%5.0%1968$86920.9%97.2%1.7%
Hamlet2.2248.24.1%9.1%9.9%1948$84223.4%93.0%0.1%
Andalusia2.1750.88.6%9.1%3.6%1969$98617.7%97.0%1.5%
Blue Grass2.3247.47.4%11.3%4.7%1979$90530.7%96.0%3.6%

All figures 2020–24.

Cities with similar populations: Penfield, OH · Mott, ND · Mounds, IL · Mount Auburn, IA · Mountainhome, PA · Murray, NE · Naplate, IL · Olga, WA · Olin, IA · Olivier, LA

About these numbers

Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up Illinois City. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.

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