Demographics of Massac County, Illinois

Massac County, Illinois had 13,502 people on July 1, 2025, by the Census Bureau’s estimate: −639 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Massac County, in four figures

13,502
Population: July 1, 2025, Vintage 2025 estimate.; −4.5%
Change since July 2020: −639 people.; 44.7 ±0.6
Median age: ACS 2020–⁠2024.; $65,116 ±$7,385
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Massac County, Illinois's population shrank 4.5% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Massac County, Illinois's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Massac County, Illinois's population shrank 4.5% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Massac County, Illinois's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	14,141	100.0	100.0
2021	13,959	98.7	100.2
2022	13,863	98.0	100.7
2023	13,741	97.2	101.6
2024	13,616	96.3	102.5
2025	13,502	95.5	103.1

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Population of Massac County, Illinois on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	14,141	−35	−16	0	−20
2021	13,959	−182	−106	0	−82
2022	13,863	−96	−112	−6	+30
2023	13,741	−122	−110	−4	−3
2024	13,616	−125	−127	−5	+9
2025	13,502	−114	−133	−8	+26

Age, 2020–2024

The median age is 44.7 ±0.6: for men 43.9 ±0.5 and for women 46.5 ±1.1. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Massac County by age, ACS 2020–2024
Age	People	Share	Illinois	United States
Under 5	630 ±62	4.5% ±0.4	5.4% ±<0.1	5.6% ±<0.1
5 to 17	2,325 ±203	16.8% ±1.5	16.4% ±0.1	16.3% ±<0.1
18 to 24	915 ±155	6.6% ±1.1	9.1% ±<0.1	9.1% ±<0.1
25 to 44	3,112 ±233	22.4% ±1.7	26.9% ±0.1	26.9% ±<0.1
45 to 64	3,834 ±266	27.7% ±1.9	25.2% ±0.1	24.8% ±<0.1
65 and over	3,049 ±251	22.0% ±1.8	17.0% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $65,116 ±$7,385, and income per person $32,040 ±$1,860, in 2024 dollars. The median is $83,390 ±$362 in Illinois and $80,734 ±$166 in the United States.

Households by income

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Households in Massac County by income, ACS 2020–2024
Household income	Households	Share	Illinois	United States
Under $25,000	1,095 ±229	20.1% ±4.1	14.6% ±0.1	14.6% ±<0.1
$25,000 to $49,999	997 ±187	18.3% ±3.3	16.0% ±0.2	16.7% ±<0.1
$50,000 to $74,999	1,092 ±211	20.0% ±3.8	14.8% ±0.1	15.5% ±<0.1
$75,000 to $99,999	856 ±164	15.7% ±2.9	12.6% ±0.1	12.6% ±<0.1
$100,000 to $149,999	917 ±174	16.8% ±3.1	18.0% ±0.2	17.5% ±<0.1
$150,000 to $199,999	325 ±89	6.0% ±1.6	10.1% ±0.1	9.6% ±<0.1
$200,000 or more	175 ±71	3.2% ±1.3	13.8% ±0.1	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Massac County by age, ACS 2020–2024
Age	Below poverty	Rate	Illinois	United States
All ages	2,196 ±406	16.3% ±3.0	11.8% ±0.1	12.5% ±0.1
Under 18	641 ±177	23.2% ±5.9	15.1% ±0.2	16.1% ±0.1
18 to 59	978 ±273	14.5% ±3.9	11.0% ±0.1	11.6% ±0.1
60 and over	577 ±160	14.5% ±3.9	10.6% ±0.1	11.0% ±<0.1

Housing, 2020–2024

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Housing in Massac County, ACS 2020–2024
Measure	Massac County	Illinois	United States
Housing units	6,822 ±24	5,457,452 ±471	143,775,355 ±10,234
Occupied	80.0% ±3.3	92.3% ±0.1	89.9% ±0.1
Vacant	20.0% ±3.3	7.7% ±0.1	10.1% ±0.1
Owner occupied	76.4% ±2.7	67.1% ±0.3	65.2% ±0.3
Renter occupied	23.6% ±3.8	32.9% ±0.2	34.8% ±0.1
Median home value	$121,900 ±$16,593	$263,300 ±$797	$332,700 ±$236
Median gross rent	$756 ±$61	$1,274 ±$5	$1,413 ±$2
Median year built	1975 ±3	1971 ±2	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Massac County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Illinois	United States
Hispanic or Latino	397 ±0	2.9% ±<0.1	18.8% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	11,960 ±115	86.3% ±0.8	58.1% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	891 ±115	6.4% ±0.8	13.3% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	8 to 70	0.1% to 0.5%	5.9% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 20	0% to 0.1%	0.1% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 20	0% to 0.1%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 100	0% to 0.7%	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	536 ±141	3.9% ±1.0	3.4% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Massac County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Illinois	United States
Born in the state	5,903 ±423	42.6% ±3.1	66.5% ±0.1	57.3% ±<0.1
Born in another state	7,771 ±399	56.0% ±2.9	17.5% ±0.1	26.9% ±<0.1
Born a citizen outside the states	0 to 9	0% to 0.1%	1.3% ±<0.1	1.7% ±<0.1
Born abroad	189 ±76	1.4% ±0.5	14.7% ±0.1	14.1% ±<0.1
Naturalized citizens	24 to 100	0.2% to 0.7%	7.7% ±0.1	7.4% ±<0.1
Not citizens	60 to 194	0.4% to 1.4%	7.0% ±0.1	6.8% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Massac County among the counties of Illinois

76th of 102 by population, July 2025. Every one is listed on the Illinois page.

Counties of Illinois near Massac County in population, July 2025
County	July 2025	Change since 2020
Clark County	15,114	−2.2%
Moultrie County	14,371	−0.8%
Pike County	14,231	−2.8%
Lawrence County	13,790	−9.7%
Washington County	13,564	−1.2%
Massac County	13,502	−4.5%
Johnson County	13,363	+0.3%
White County	13,250	−4.0%
Ford County	13,216	−2.2%
Clay County	12,793	−3.6%
Cass County	12,463	−4.0%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026