Henry County, Illinois Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 30th-largest in Illinois
The population of Henry County, Illinois is 48,948 as of the 2023 American Community Survey, making it the 30th-largest county in Illinois. The median household income is $69,912, the median home value is $145,300, and the median age is 43.4.
The population of Henry County has declined 4.5% since 2010 (50,459 → 48,177), a -0.33% annualized rate.
48,948
Population
-0.33%
Annual growth
59
People / sq mi
$69,912
Median Income
$145,300
Median Home Value
Henry County covers 823 sq mi of land at 59.5 people per square mile.
About Henry County, IL
The poverty rate is what most separates Henry County from the typical county: 5.0% of residents live below the federal poverty line, against 12.4% nationally. Henry County is a county in Illinois with a population of 48,948. It ranks #30 among counties in Illinois by population.
Household earnings are middling, with a median of $69,912 — below the US median of $78,538. Only 5.0% of residents live in poverty, below the national 12.4%. Homes carry a median value of $145,300, with typical rent around $837.
24.3% of adults 25 and older hold a bachelor’s degree, below the national average of 35.0%. Remote work is below the national 14.0% at 7.5%, and the average commute runs about 23 minutes each way.
Henry County Population History (2010-2024)
The county of Henry County had a population of 50,459 in 2010 and 48,177 in 2024, a -4.5% growth over 14 years. The peak was 50,459 in 2010. Average annual growth rate: -0.33%.
48,177
Population (2024)
50,459
Population (2010)
50,459
Peak (2010)
-0.33%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 50,459 |
| 2011 | 50,293 |
| 2012 | 50,263 |
| 2013 | 49,932 |
| 2014 | 49,841 |
| 2015 | 49,654 |
| 2016 | 49,511 |
| 2017 | 49,222 |
| 2018 | 49,082 |
| 2019 | 48,933 |
| 2020 | 49,178 |
| 2021 | 48,929 |
| 2022 | 48,567 |
| 2023 | 48,362 |
| 2024 | 48,177 |
Race & Ethnicity
| White | 88.5% |
| Black or African American | 2.2% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.9% |
| Two or More Races | 0.0% |
Age & Sex
43.4
Median Age
50.4%
Female
49.6%
Male
21.2%
Age 65+
Age Distribution
Children (under 15): 17.7% · Seniors (65+): 21.2%
Income & Poverty
| Median household income | $69,912$-11,790 vs state |
| Mean household income | $91,842 |
| Per-capita income | $38,767 |
| Poverty rate | 5.0%-3.2% vs state |
| Unemployment rate | 2.5% |
| Employment-to-population | 59.8% |
Top Industries by Employment
The largest employment sector in Henry County is professional & business services, accounting for 21.5% of workers.
How residents commute
0.1%
Drive alone
2.7%
Carpool
82.0%
Public transit
7.5%
Work from home
22.6 min
Avg commute
Housing
$145,300$-105,200 vs state
Median home value
$837
Median rent
80.4%
Homeownership rate
22,208
Total housing units
91.2%
Occupied
8.8%
Vacant
19.6%
Renter-occupied
Social & access
95.9%
With health insurance
91.3%
With broadband internet
20.5%
Foreign-born
7.8%
Veterans (18+)
13.6%
With a disability
95.9%
Speak language other than English at home
Education
92.1%
High School+
24.3%
Bachelor's+
Largest cities in Illinois
Other counties in Illinois
Part of Illinois
Metro areas in Illinois
County rankings
Frequently Asked Questions
Henry County, Illinois has a population of 48,948 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 30th-largest county in Illinois. Population density is 59 people per square mile.
The population of Henry County has declined 4.5% since 2010 (50,459 → 48,177), a -0.33% annualized rate.
The median household income in Henry County, Illinois is $69,912, with mean (average) household income of $91,842 and per-capita income of $38,767. 5.0% of residents live below the federal poverty level.
In Henry County, the largest racial and ethnic groups are White (88.5%), Black or African American (2.2%), Hispanic or Latino (0.9%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Henry County, Illinois is 43.4 years. Residents are 50.4% female and 49.6% male.
The median home value in Henry County is $145,300 and median monthly rent is $837. 80.4% of occupied housing units are owner-occupied. The county has 22,208 total housing units, 8.8% of which are vacant.
The largest employment sector in Henry County, Illinois is professional, scientific, and management services, employing 21.5% of workers. The unemployment rate is 2.5%.
Chicago is among the largest cities associated with Henry County, Illinois, with a population of 2,707,648.
Henry County, IL Climate
Henry County, IL has an average annual temperature of 9.7°C (49°F) and receives about 951 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
9.7°C
Avg Temp
951
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -7° / 20° | 36 mm |
| February | -3° / 26° | 33 mm |
| March | 3° / 38° | 70 mm |
| April | 10° / 50° | 97 mm |
| May | 16° / 61° | 104 mm |
| June | 22° / 71° | 110 mm |
| July | 24° / 74° | 109 mm |
| August | 22° / 72° | 107 mm |
| September | 18° / 64° | 94 mm |
| October | 11° / 53° | 72 mm |
| November | 4° / 38° | 66 mm |
| December | -3° / 26° | 53 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 Henry County, IL
The most comfortable months to visit Henry County, IL are typically June, August and September, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 29°C high). The coldest is January (near -11°C low). June is usually the wettest month.
Where to stay near Henry County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.