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
In Montgomery County, home values do the distinguishing — a median of $102,200. With 28,078 residents, Montgomery County is a county in Illinois. It ranks #48 among counties in Illinois by population.
Median household income is $61,863, below the US median of $78,538. About 8.2% of residents live below the federal poverty level, below the national 12.4%. Home prices sit near the bottom of the range at $102,200, with typical rent around $715.
Degree attainment is mid-range for US counties: 18.2% of adults hold a four-year degree, below the national 35.0%. Around 9.1% of workers work from home, below the national 14.0%, and the average commute runs about 24 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.
Montgomery County, IL Climate
Montgomery County, IL has an average annual temperature of 11.9°C (53°F) and receives about 999 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
11.9°C
Avg Temp
999
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -3° / 26° | 50 mm |
| February | 0° / 31° | 51 mm |
| March | 6° / 42° | 89 mm |
| April | 12° / 54° | 104 mm |
| May | 18° / 64° | 109 mm |
| June | 23° / 73° | 104 mm |
| July | 25° / 77° | 90 mm |
| August | 24° / 75° | 82 mm |
| September | 20° / 67° | 82 mm |
| October | 13° / 56° | 72 mm |
| November | 7° / 44° | 91 mm |
| December | 0° / 32° | 75 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Montgomery County, IL
The most comfortable months to visit Montgomery County, IL are typically September, June and August, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 31°C high). The coldest is January (near -8°C low). May is usually the wettest month.
Where to stay near Montgomery County
Visiting or relocating to Montgomery County, IL? Compare hotels and short-term rentals across the county — live availability and prices.
Top-rated places to stay near Montgomery County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.