Greater Illinois City, Northwest Illinois, IL demographics:
population, income, and more

Total population
598
-4.8% year-over-year change
Median household income
$91,458/yr
3.3% year-over-year change
Housing units
303
-6.8% year-over-year change

Illinois City population

How many people live in Illinois City

Illinois City is home to 598 residents, according to the most recent Census data. Gender-wise, 44.2% of Illinois City locals are male, and 55.8% are female.

Total population
598
-4.8% year-over-year change
Gender ratio
Male
44.2%
264
Female
55.8%
334
Value Percent YoY change
Male 264 44.2% -17.8%
Female 334 55.8% 8.8%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in Illinois City is 55, with the population distributed as follows: about 13.9% are children under 15, then 9.5% are in the 15 to 24 age group. Adults between 25 and 44 make up 6.9% of the population, while another 48.2% fall into the 45 to 64 bracket. Finally, around 21.6% are 65 or older.

Median age
55.3
Age breakdown
Under 15
13.9%
15 to 24
9.5%
25 to 44
6.9%
45 to 64
48.2%
Over 65
21.6%
Value Percent YoY change
Under 15 83 13.9% 12.2%
15 to 24 57 9.5% 42.5%
25 to 44 41 6.9% -41.4%
45 to 64 288 48.2% -5.3%
Over 65 129 21.6% -8.5%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In Illinois City, 97.7% of the population are US-born citizens, while 2.3% have gained naturalized citizenship.

Citizenship
U.S.-born citizens
97.7%
Non-U.S.-born citizens
2.3%
Non-citizens
0%
Value Percent YoY change
U.S.-born citizens 584 97.7% -3.5%
Non-U.S.-born citizens 14 2.3% -41.7%
Racial breakdown
White
98.5%
Black or African American
0%
American Indian and Alaska Native
0%
Asian
1.5%
Native Hawaiian and other Pacific Islander
0%
Two or more races
0%
Other
0%
Value Percent
White 589 98.5%
Asian 9 1.5%

Households in Illinois City

A peek inside Illinois City households

Illinois City has 273 households, with an average of 2 members in each. Of these, 70% are families, while the remaining 30% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
273
-4.9% year-over-year change
Average people per household
2
Non-family households
82
Family households
191
Value Percent YoY change
Non-family households 82 30% -4.7%
Family households 191 70% -5.0%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in Illinois City

The housing landscape of Illinois City

Illinois City's housing consists of 303 units, with 96.7% being detached single-family homes ideal for those wanting space. Then there are the multifamily buildings in the area, and for those seeking flexibility, non-traditional options like mobile homes account for 1.6% of the housing landscape.

Housing units
303
-6.8% year-over-year change
Housing types
Value Percent
1 unit, detached 293 96.7%
50 or more units 5 1.6%
Mobile home 5 1.6%
Homes built since 2020
% year-over-year change

The age of buildings in Illinois City

In Illinois City, the median construction year is 1948. About 27% of homes were built before the 1940s, with another 28% going up by 1949. Most development happened in the second half of the 20th century.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 82 27% -11.8%
Built between 1940 and 1949 85 28% 11.8%
Built between 1960 and 1969 31 10.2% 29.2%
Built between 1970 and 1979 35 11.5% 34.6%
Built between 1980 and 1989 12 4% -50.0%
Built between 1990 and 1999 20 6.6% 5.3%
Built between 2000 and 2009 27 8.9% -38.6%
Built between 2010 and 2019 12 4% -14.3%
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

Illinois City occupancy rates

Out of the 273 occupied housing units in Illinois City, 91.2% are owner-occupied, while 8.4% are lived in by tenants. Meanwhile, 9.9% of all homes on the local market sit vacant.

Occupied housing units
273
-4.9% year-over-year change
Occupancy breakdown
Renter occupied
23
Owner occupied
249
Value Percent YoY
change
Renter occupied 23 8.4% 130.0%
Owner occupied 249 91.2% -9.8%
Unoccupied housing units
9.9%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

Illinois City housing costs

Median housing costs per month
$1,274/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.

Education in Illinois City

Illinois City education at a glance

About 36.7% of the population in Illinois City went to high school, while 34.6% pursued college studies. Another 7.6% earned an associate degree and 14% hold a bachelor’s. Meanwhile, 6.2% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 5 1% N/A
High school diploma 189 36.7% -14.5%
College diploma 178 34.6% 10.6%
Associate degree 39 7.6% -52.4%
Bachelor's degree 72 14% 20.0%
Graduate degree 32 6.2% 6.7%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in Illinois City

How much people earn in Illinois City

The average annual household income in Illinois City was $104,571 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +11.1% change from the previous year. At the same time, the median income stood at $91,458, reflecting a +3.3% shift over the same period.

Average household income in Illinois City
$104,571/year
11.1% year-over-year change
Median household income in Illinois City
$91,458/year
3.3% year-over-year change

Illinois City income by age

Those with someone between 45 and 64 in charge, often well established professionally, earn $119,821 overall. Overall, 95.4% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
45 - 64 $119,821 34.0%
Over 65 $55,625 1.4%
Above poverty level
538
Below poverty level
26
Value Percent YoY
change
Above poverty level 538 95.4% -5.8%
Below poverty level 26 4.6% 0.0%

Employment in Illinois City

Workforce and job types in Illinois City

62.6% of the working population are employed in professional or administrative positions, while 37.4% are in hands-on or service-based jobs. Also, 11.2% run their own businesses, 61.6% are employed by private companies, and 22.6% work in the public sector.

Workforce demographics

White collar
191
Blue collar
114
Value Percent YoY change
White collar 191 62.6% -15.9%
Blue collar 114 37.4% 17.5%
Employer type
Self employees
11.2%
Private companies
61.6%
Governmental workers
22.6%
Not for profit companies
4.6%
Value Percent YoY change
Self employees 34 11.2% -32.0%
Private companies 188 61.6% 3.9%
Governmental workers 69 22.6% -12.7%
Not for profit companies 14 4.6% 7.7%

Transportation in Illinois City

How people get around in Illinois City

In Illinois City, the average commute time is 15 minutes.

Commute time
15 min
-25.0% year-over-year change
Means of transportation
Value Percent YoY change
Car 276 100% -6.1%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in Illinois City by zipcode?

Zipcode Population Number of households Median income Average income
61259 1,053 480 $91,458 $104,571

Explore more communities

FAQs about Illinois City demographics 

What is the total population of Illinois City?

Illinois City has a total population of 598 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by -4.8% compared to a year ago.

What is the gender ratio in Illinois City?

The gender ratio in Illinois City is as follows:
  • 44.2% males (264 residents)
  • 55.8% females (334 residents)

What is the median age in Illinois City?

The median age in Illinois City is 55.3.

What is the age distribution of the population in Illinois City?

The age distribution in Illinois City is as follows:
  • Under 15: 13.9% (83 residents)
  • Ages 15-24: 9.5% (57 residents)
  • Ages 25-44: 6.9% (41 residents)
  • Ages 45-64: 48.2% (288 residents)
  • Over 65: 21.6% (129 residents)

What is the racial and ethnic makeup of Illinois City?

The racial and ethnic makeup of Illinois City is as follows:
  • White: 98.5% (589 residents)
  • Black or African American: 0% ( residents)
  • American Indian and Alaska Native: 0% ( residents)
  • Asian: 1.5% (9 residents)
  • Native Hawaiian and Other Pacific Islander: 0% ( residents)
  • Two or More Races: 0% ( residents)
  • Other: 0% ( residents)

What percentage of the population in Illinois City are U.S.-born citizens?

U.S.-born citizens represent 97.7% of the population in Illinois City.

How many housing units are there in Illinois City?

There are 303 housing units in Illinois City, reflecting a -6.8% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in Illinois City and what is the average household size?

Illinois City has a total of 273 households, with an average of 2 people in each.

What is the median household income in Illinois City?

Illinois City has a median household income of $91,458, representing a +3.3% shift from the previous year, according to the U.S. Census Bureau.

What is the job market overview for Illinois City?

Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 62.6% (191 residents)
  • Blue-collar workers: 37.4% (114 residents)

Places of employment:
  • Self-employed: 11.2% (34 residents)
  • Private companies: 61.6% (188 residents)
  • Governmental workers: 22.6% (69 residents)
  • Not-for-profit companies: 4.6% (14 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025