Montgomery County, Illinois Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 48th-largest in Illinois
The population of Montgomery County, Illinois is 28,078 as of the 2023 American Community Survey, making it the 48th-largest county in Illinois. The median household income is $61,863, the median home value is $102,200, and the median age is 42.6.
The population of Montgomery County has declined 8.2% since 2010 (30,095 → 27,615), a -0.61% annualized rate.
28,078
Population
-0.61%
Annual growth
40
People / sq mi
$61,863
Median Income
$102,200
Median Home Value
Montgomery County covers 704 sq mi of land at 39.9 people per square mile.
About Montgomery County, IL
Montgomery County is a county in Illinois with a population of 28,078. It ranks #48 among counties in Illinois by population. The median age is 42.6, older than the national median. The population is 53.0% male and 47.0% female.
The median household income in Montgomery County is $61,863, below the US median of $74,580. 8.2% of residents live below the federal poverty level. Home values sit at a median of $102,200, with monthly rent averaging $715. The homeownership rate of 76.3% is higher than the national rate of 64.8%.
Educational attainment in Montgomery County reflects 18.2% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 9.1% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 23.9 minutes each way.
Montgomery County Population History (2010-2024)
The county of Montgomery County had a population of 30,095 in 2010 and 27,615 in 2024, a -8.2% growth over 14 years. The peak was 30,095 in 2010. Average annual growth rate: -0.61%.
27,615
Population (2024)
30,095
Population (2010)
30,095
Peak (2010)
-0.61%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 30,095 |
| 2011 | 29,866 |
| 2012 | 29,620 |
| 2013 | 29,367 |
| 2014 | 29,450 |
| 2015 | 29,196 |
| 2016 | 29,057 |
| 2017 | 28,781 |
| 2018 | 28,705 |
| 2019 | 28,401 |
| 2020 | 28,242 |
| 2021 | 28,128 |
| 2022 | 27,971 |
| 2023 | 27,756 |
| 2024 | 27,615 |
Race & Ethnicity
| White | 93.4% |
| Black or African American | 2.7% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.8% |
| Two or More Races | 0.0% |
Age & Sex
42.6
Median Age
47.0%
Female
53.0%
Male
21.1%
Age 65+
Age Distribution
Children (under 15): 16.6% · Seniors (65+): 21.1%
Income & Poverty
| Median household income | $61,863$-19,839 vs state |
| Mean household income | $80,654 |
| Per-capita income | $32,463 |
| Poverty rate | 8.2% |
| Unemployment rate | 3.1% |
| Employment-to-population | 49.2% |
Top Industries by Employment
The largest employment sector in Montgomery County is professional & business services, accounting for 24.1% of workers.
How residents commute
0.0%
Drive alone
3.5%
Carpool
80.6%
Public transit
9.1%
Work from home
23.9 min
Avg commute
Housing
$102,200$-148,300 vs state
Median home value
$715
Median rent
76.3%
Homeownership rate
12,528
Total housing units
89.9%
Occupied
10.1%
Vacant
23.7%
Renter-occupied
Social & access
95.5%
With health insurance
88.9%
With broadband internet
15.8%
Foreign-born
8.7%
Veterans (18+)
17.9%
With a disability
97.5%
Speak language other than English at home
Education
90.0%
High School+
18.2%
Bachelor's+
Largest cities in Illinois
Other counties in Illinois
Part of Illinois
Metro areas in Illinois
County rankings
Frequently Asked Questions
Montgomery County, Illinois has a population of 28,078 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 48th-largest county in Illinois. Population density is 40 people per square mile.
The population of Montgomery County has declined 8.2% since 2010 (30,095 → 27,615), a -0.61% annualized rate.
The median household income in Montgomery County, Illinois is $61,863, with mean (average) household income of $80,654 and per-capita income of $32,463. 8.2% of residents live below the federal poverty level.
In Montgomery County, the largest racial and ethnic groups are White (93.4%), Black or African American (2.7%), Hispanic or Latino (1.8%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Montgomery County, Illinois is 42.6 years. Residents are 47.0% female and 53.0% male.
The median home value in Montgomery County is $102,200 and median monthly rent is $715. 76.3% of occupied housing units are owner-occupied. The county has 12,528 total housing units, 10.1% of which are vacant.
The largest employment sector in Montgomery County, Illinois is professional, scientific, and management services, employing 24.1% of workers. The unemployment rate is 3.1%.
Chicago is among the largest cities associated with Montgomery County, Illinois, with a population of 2,707,648.
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Statewide data for Illinois
Population, race, income, age, and trends across Illinois
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.