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 distinguished by its share of foreign-born residents, 51.9% of the population. Massac County is a county in Illinois with a population of 13,958.
The typical household here earns about $62,584, below the US median of $78,538. Poverty runs at 9.2%, below the national 12.4%. Housing is relatively affordable, with a median home value of $118,000, with typical rent around $793.
Degree attainment is on the lower side for US counties: 16.3% of adults hold a bachelor’s degree, below the national 35.0%. Remote work is on the lower side here, at 5.7%, below the national 14.0%, and the average commute runs about 21 minutes each way.
The large foreign-born share is a defining thread in Massac County, shaping language, household composition, and the labor force behind the economic figures above.
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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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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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.