Massac County, Illinois Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 75th-largest in Illinois
The population of Massac County, Illinois is 13,958 as of the 2023 American Community Survey, making it the 75th-largest county in Illinois. The median household income is $62,584, the median home value is $118,000, and the median age is 45.0.
The population of Massac County has declined 11.4% since 2010 (15,380 → 13,627), a -0.86% annualized rate.
13,958
Population
-0.86%
Annual growth
59
People / sq mi
$62,584
Median Income
$118,000
Median Home Value
Massac County covers 237 sq mi of land at 58.9 people per square mile.
About Massac County, IL
Massac County is a county in Illinois with a population of 13,958. It ranks #75 among counties in Illinois by population. The median age is 45.0, older than the national median. The population is 48.8% male and 51.2% female.
The median household income in Massac County is $62,584, below the US median of $74,580. 9.2% of residents live below the federal poverty level. Home values sit at a median of $118,000, with monthly rent averaging $793. The homeownership rate of 79.0% is higher than the national rate of 64.8%.
Educational attainment in Massac County reflects 16.3% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 5.7% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 21.2 minutes each way.
Massac County Population History (2010-2024)
The county of Massac County had a population of 15,380 in 2010 and 13,627 in 2024, a -11.4% growth over 14 years. The peak was 15,380 in 2010. Average annual growth rate: -0.86%.
13,627
Population (2024)
15,380
Population (2010)
15,380
Peak (2010)
-0.86%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 15,380 |
| 2011 | 15,281 |
| 2012 | 15,067 |
| 2013 | 14,846 |
| 2014 | 14,756 |
| 2015 | 14,568 |
| 2016 | 14,461 |
| 2017 | 14,298 |
| 2018 | 14,037 |
| 2019 | 13,772 |
| 2020 | 14,137 |
| 2021 | 13,953 |
| 2022 | 13,858 |
| 2023 | 13,751 |
| 2024 | 13,627 |
Race & Ethnicity
| White | 87.9% |
| Black or African American | 6.3% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.0% |
| Two or More Races | 0.0% |
Age & Sex
45.0
Median Age
51.2%
Female
48.8%
Male
21.4%
Age 65+
Age Distribution
Children (under 15): 17.1% · Seniors (65+): 21.4%
Income & Poverty
| Median household income | $62,584$-19,118 vs state |
| Mean household income | $74,853 |
| Per-capita income | $31,578 |
| Poverty rate | 9.2%+1.0% vs state |
| Unemployment rate | 1.9% |
| Employment-to-population | 53.0% |
Top Industries by Employment
The largest employment sector in Massac County is professional & business services, accounting for 19.9% of workers.
How residents commute
0.1%
Drive alone
0.7%
Carpool
85.8%
Public transit
5.7%
Work from home
21.2 min
Avg commute
Housing
$118,000$-132,500 vs state
Median home value
$793
Median rent
79.0%
Homeownership rate
6,824
Total housing units
80.3%
Occupied
19.7%
Vacant
21.0%
Renter-occupied
Social & access
91.0%
With health insurance
85.5%
With broadband internet
51.9%
Foreign-born
9.3%
Veterans (18+)
18.8%
With a disability
97.1%
Speak language other than English at home
Education
89.3%
High School+
16.3%
Bachelor's+
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County rankings
Frequently Asked Questions
Massac County, Illinois has a population of 13,958 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 75th-largest county in Illinois. Population density is 59 people per square mile.
The population of Massac County has declined 11.4% since 2010 (15,380 → 13,627), a -0.86% annualized rate.
The median household income in Massac County, Illinois is $62,584, with mean (average) household income of $74,853 and per-capita income of $31,578. 9.2% of residents live below the federal poverty level.
In Massac County, the largest racial and ethnic groups are White (87.9%), Black or African American (6.3%), Hispanic or Latino (1.0%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Massac County, Illinois is 45.0 years. Residents are 51.2% female and 48.8% male.
The median home value in Massac County is $118,000 and median monthly rent is $793. 79.0% of occupied housing units are owner-occupied. The county has 6,824 total housing units, 19.7% of which are vacant.
The largest employment sector in Massac County, Illinois is professional, scientific, and management services, employing 19.9% of workers. The unemployment rate is 1.9%.
Chicago is among the largest cities associated with Massac 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.