Cumberland County, Illinois Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 87th-largest in Illinois
The population of Cumberland County, Illinois is 10,378 as of the 2023 American Community Survey, making it the 87th-largest county in Illinois. The median household income is $69,826, the median home value is $117,700, and the median age is 42.3.
The population of Cumberland County has declined 6.8% since 2010 (11,053 → 10,305), a -0.50% annualized rate.
10,378
Population
-0.50%
Annual growth
30
People / sq mi
$69,826
Median Income
$117,700
Median Home Value
Cumberland County covers 346 sq mi of land at 30.0 people per square mile.
About Cumberland County, IL
Homeownership is the standout figure in Cumberland County: 83.5% of homes are owner-occupied, higher than the national rate. Cumberland County is a county in Illinois with a population of 10,378.
Household earnings are middling, with a median of $69,826 — below the US median of $78,538. Poverty is relatively low for US counties at 5.5%, below the national 12.4%. Homes are comparatively cheap — a median value of $117,700, with typical rent around $756.
Roughly 18.6% of adults have a bachelor’s, below the national 35.0%. Around 7.4% of workers work from home, below the national 14.0%, and the average commute runs about 24 minutes each way.
The ownership rate anchors the housing story in Cumberland County, and tends to move with the age structure and home-value figures above.
Cumberland County Population History (2010-2024)
The county of Cumberland County had a population of 11,053 in 2010 and 10,305 in 2024, a -6.8% growth over 14 years. The peak was 11,084 in 2011. Average annual growth rate: -0.50%.
10,305
Population (2024)
11,053
Population (2010)
11,084
Peak (2011)
-0.50%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 11,053 |
| 2011 | 11,084 |
| 2012 | 10,955 |
| 2013 | 10,911 |
| 2014 | 10,931 |
| 2015 | 10,869 |
| 2016 | 10,884 |
| 2017 | 10,887 |
| 2018 | 10,782 |
| 2019 | 10,733 |
| 2020 | 10,437 |
| 2021 | 10,358 |
| 2022 | 10,296 |
| 2023 | 10,272 |
| 2024 | 10,305 |
Race & Ethnicity
| White | 96.0% |
| Black or African American | 0.1% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.9% |
| Two or More Races | 0.0% |
Age & Sex
42.3
Median Age
48.5%
Female
51.5%
Male
20.3%
Age 65+
Age Distribution
Children (under 15): 19.8% · Seniors (65+): 20.3%
Income & Poverty
| Median household income | $69,826$-11,876 vs state |
| Mean household income | $88,805 |
| Per-capita income | $36,270 |
| Poverty rate | 5.5%-2.7% vs state |
| Unemployment rate | 1.6% |
| Employment-to-population | 65.6% |
Top Industries by Employment
The largest employment sector in Cumberland County is professional & business services, accounting for 21.8% of workers.
How residents commute
0.0%
Drive alone
4.0%
Carpool
82.8%
Public transit
7.4%
Work from home
24.1 min
Avg commute
Housing
$117,700$-132,800 vs state
Median home value
$756
Median rent
83.5%
Homeownership rate
4,720
Total housing units
88.6%
Occupied
11.4%
Vacant
16.5%
Renter-occupied
Social & access
94.4%
With health insurance
91.5%
With broadband internet
14.0%
Foreign-born
6.1%
Veterans (18+)
13.4%
With a disability
99.1%
Speak language other than English at home
Education
93.9%
High School+
18.6%
Bachelor's+
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County rankings
Frequently Asked Questions
Cumberland County, Illinois has a population of 10,378 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 87th-largest county in Illinois. Population density is 30 people per square mile.
The population of Cumberland County has declined 6.8% since 2010 (11,053 → 10,305), a -0.50% annualized rate.
The median household income in Cumberland County, Illinois is $69,826, with mean (average) household income of $88,805 and per-capita income of $36,270. 5.5% of residents live below the federal poverty level.
In Cumberland County, the largest racial and ethnic groups are White (96.0%), Hispanic or Latino (0.9%), Black or African American (0.1%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Cumberland County, Illinois is 42.3 years. Residents are 48.5% female and 51.5% male.
The median home value in Cumberland County is $117,700 and median monthly rent is $756. 83.5% of occupied housing units are owner-occupied. The county has 4,720 total housing units, 11.4% of which are vacant.
The largest employment sector in Cumberland County, Illinois is professional, scientific, and management services, employing 21.8% of workers. The unemployment rate is 1.6%.
Chicago is among the largest cities associated with Cumberland County, Illinois, with a population of 2,707,648.
Cumberland County, IL Climate
Cumberland County, IL has an average annual temperature of 11.7°C (53°F) and receives about 1038 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
11.7°C
Avg Temp
1038
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -3° / 26° | 54 mm |
| February | 0° / 31° | 57 mm |
| March | 6° / 42° | 90 mm |
| April | 12° / 53° | 100 mm |
| May | 17° / 63° | 105 mm |
| June | 23° / 73° | 101 mm |
| July | 25° / 76° | 110 mm |
| August | 23° / 74° | 87 mm |
| September | 20° / 67° | 81 mm |
| October | 13° / 56° | 76 mm |
| November | 6° / 43° | 95 mm |
| December | 0° / 32° | 82 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 Cumberland County, IL
The most comfortable months to visit Cumberland 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). July is usually the wettest month.
Where to stay near Cumberland County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.