Massac County, Illinois

County in IL, US

By Neilsberg Research

Last updated May 1, 2026

Key Indicators

A quick look at key numbers

Population

13,865

Source: U.S. Census Bureau American Community Survey (ACS) 2020-2024 5-Year Estimates

Median Age

44.7

years ∙ half population younger than 44.7, half older

Diversity Index

24.9%

chance two random people differ in race and ethnicity

Nativity

1.4%

foreign-born population

98.6%Native

1.4% Foreign-born

Geographic Context

Location, size, and surroundings

About

Massac County is a county in Illinois, United States.

Location

County in IL, US

Co-ordinates

DEC37.216119° N, 88.705658° W

DMS37° 12′ 58.03″ N, 88° 42′ 20.37″ W

Population Density & area

58.45/sq mi (22.57/km²)

Total Area

242.1 sq mi (627 km²)

Land Area

237.2 sq mi (614.2 km²) · 98%

Water Area

4.9 sq mi (12.8 km²) · 2%

Demographics & Living

Who lives here, how households are formed, and community composition

Population Composition

Key characteristics of the population

Sex Distribution

48.7% male

Male 48.7%

Female 51.3%

males per 100 females

Massac County 95

Illinois 97.7

United States 98

Nativity

1.4%

foreign-born population

98.6%Native

1.4% Foreign-born

% Foreign-born

Massac County 1.4%

Illinois 14.7%

United States 14.1%

Age Distribution

How the population is spread across age groups

Median Age

44.7

years ∙ half population younger than 44.7, half older

Massac County

44.7

Illinois

United States

38.9

Dependency ratio

76.4

dependents per 100 working-age adults

Massac County 76.4

Illinois 63.5

United States 64.4

AGE DISTRIBUTION

Distribution of age group

Median age

	Massac County	Illinois	United States
Age Group
Children (Under 18)	21.3%	21.8%	22%
Working age (18-64)	56.7%	61.2%	60.8%
Senior (65+)	22%	17%	17.2%
Dependency ratio
Total dependency ratio	76.4	63.5	64.4
Child dependency ratio	37.6	35.7	36.1
Old-age dependency ratio	38.8	27.8	28.3

Racial & Ethnic Composition

Racial and ethnic makeup and how it compares

Race & Ethnicity

White

86.3%

Black

6.4%

Asian

0.3%

Hispanic

2.9%

Other

4.1%

Note: White, Black, and Asian refer to individuals belonging to a single race and not of Hispanic origin. Hispanics may be of any race.

Diversity Index

24.9%

chance two random people differ in race and ethnicity

Massac County 24.9%

Illinois 60.5%

United States 61.4%

Note: The Diversity Index (DI), based on the Blau Index, measures the probability that two randomly selected individuals differ in race and ethnicity. Values range from 0 (no diversity) to 1 (high diversity) and are shown as percentages.

RACIAL & ETHNIC COMPOSITION

Race & Ethnicity

Percentage of Massac County population

	Massac County	Illinois	United States
Hispanic or Latino	2.9%	18.8%	19.3%
Mexican	1.5%	14.4%	11.3%
Puerto Rican	0.3%	1.6%	1.8%
Cuban	0%	0.3%	0.8%
Other Hispanic / Latino	1.1%	2.5%	5.5%
Not Hispanic or Latino	97.1%	81.2%	80.7%
One race	93.2%	77.8%	76.4%
White	86.3%	58.1%	57.4%
Black or African American	6.4%	13.3%	11.9%
American Indian and Alaska Native	0%	0.1%	0.5%
Asian	0.3%	5.9%	5.9%
Native Hawaiian and Other Pacific Islander	0%	0%	0.2%
Some Other Race	0.3%	0.4%	0.6%
Two or more races (Multiracial)	3.9%	3.4%	4.3%

Household & Families Composition

Household size, type, and family structure

Household structure

63.3% family

Family 63.3%

Non family 36.7%

% family households

Massac County 63.3%

Illinois 62.2%

United States 64.2%

Average household size

2.49

persons per household

Massac County

2.49

Illinois

2.46

United States

2.53

Household & Family COMPOSITION

Households

Percentage of Massac County population

	Massac County	Illinois	United States
Total households	5,457	5,036,449	129,227,496
Average houshold size	2.49	2.46	2.53
Family households	3,456	3,130,978	82,990,528
Average family size	3.01	3.14	3.14
Married couple family	2,667	2,282,435	60,637,388
Other families	789	848,543	22,353,140
Male householder	188	248,521	6,572,819
Female householder	601	600,022	15,780,321
Non-family households	2,001	1,905,471	46,236,968
One-person households	1,624	1,569,881	37,140,836
Male householder	702	712,191	16,871,444
Senior (65+) living alone	213	210,051	5,225,110
Female householder	922	857,690	20,269,392
Senior (65+) living alone	489	417,870	10,089,070
Other living arrangements	377	335,590	9,096,132

Housing Profile

Housing stock, ownership, rentals, and cost burdens

Total housing units

6,822

housing units

Massac County 6,822

Illinois 5,457,452

United States 143,775,355

Occupancy status

80% occupied

Occupied 80%

Vacant 20%

vacancy rate

Massac County 20%

Illinois 7.7%

United States 10.1%

Housing Characteristics

How the housing supply is structured and used

Types of Housing unit

77%

Single family houses

77%

Apartments in multi-unit structures

8.7%

Mobile homes

14.4%

Boat, RV, van, etc

Median Year Built

1975

Half of houses were built before 1975, and half after.

Historic ∙ 1939 or earlier

12%

Postwar & mid-century ∙ 1940 - 1969

31.4%

Late 20th century ∙ 1970 - 1999

41.8%

Modern ∙ 2000 or later

14.8%

Note: Median year built reflects occupied units only; distribution includes all units.

Housing Characteristics

Units, rooms & bedrooms

Physical characteristics of housing units

	Massac County	Illinois	United States
Rooms per unit
Median rooms	5.5	5.6	5.5
1–3 rooms	5.9%	14.6%	15.1%
4–6 rooms	66%	50.9%	51.6%
7+ rooms	28.1%	34.6%	33.4%
Bedrooms
No bedroom / studio	2.6%	3.1%	2.9%
1 bedroom	3.9%	11.5%	10.9%
2 bedrooms	27.7%	27.7%	25%
3 bedrooms	49.9%	35.8%	38.7%
4+ bedrooms	15.9%	21.7%	22.4%
At a glance
Median year built	1975	1971	1981
Total housing units	6,822	5,457,452	143,775,355

Occupancy Profile

Who is inside and how they use it

Homeownership

76.4% owners

Renter-occupied 23.6%

Owner-occupied 76.4%

homeownership rate

Massac County 76.4%

Illinois 67.1%

United States 65.2%

Average household size

2.51

Owner-occupied

2.43

Renter-occupied

owner-occupied average size

Massac County 2.51

Illinois 2.62

United States 2.64

Housing Characteristics

Occupied unit characteristics

Tenure, crowding, and utilities

	Massac County	Illinois	United States
Total occupied units	5,457	5,036,449	129,227,496
Year moved in
2020 or later	12%	23.3%	24.8%
2010 to 2019	38.8%	38.1%	39.6%
2000 to 2009	19.7%	17.3%	16.4%
1999 or earlier	29.4%	21.3%	19.1%
Occupants per room
1.00 or fewer	98%	97.5%	96.6%
1.01 to 1.50	2%	1.6%	2.2%
1.51 or more	0%	0.8%	1.2%
Vehicles availability
No vehicles	5.1%	11%	8.4%
1 vehicle	33.3%	35.7%	33.1%
2 vehicles	40.2%	35.1%	36.6%
3 or more vehicles	21.4%	18.3%	21.9%
House heating fuel used
Gas	61.4%	79.5%	51.4%
Electricity	36.8%	18.6%	41.3%
Solar	0%	0.1%	0.3%
Fuel oil, kerosene etc	0%	0.1%	3.9%
All other fuels	1.8%	0.8%	2%
No fuel used	0%	0.8%	1.2%
Selected characteristics
Lacking complete plumbing	0%	0.3%	0.4%
Lacking complete kitchen	0.1%	0.8%	0.8%
No telephone service available	0.3%	0.8%	0.9%

Housing Value

What owner-occupied units are worth

Median home value

$121,900

owner-occupied units

Median value(USD)

Massac County

$121,900

Illinois

$263,300

United States

$332,700

Housing Cost Burden

19.5%

of homeowners with a mortgage are cost-burdened

% Cost-Burdened Households

Owners with a mortgage

19.5%

Owners without a mortgage

11.7%

Renters

50.6%

Note: Households spending 30% or more of their income on housing costs are considered cost-burdened.

Financial characteristics

Property value and housing costs

Tenure, crowding, and utilities

	Massac County	Illinois	United States
Property value
Median Value	$121,900	$263,300	$332,700
Under $100,000	43.6%	13.7%	11.4%
$100,000 - $200,000	25.6%	21.5%	15.8%
$200,000 - $300,000	17.9%	22.3%	17.8%
$300,000 - $500,000	10.8%	27.7%	26.9%
$500,000 - $1,000,000	1.6%	12.1%	20.9%
$1,000,000 and more	0.4%	2.7%	7.1%
Owner-occupied households
With a mortgage	46.9%	60.8%	60.6%
Without a mortgage	53.1%	39.2%	39.4%
Median monthly owner costs
With a mortgage	$1,318	$1,987	$1,963
Without a mortgage	$527	$792	$638
Gross rent
Median rent	$756	$1,274	$1,413

Education Profile

How educated is the community and how education pays off

Adults with a college degree

17%

of adults 25+ with a bachelor's degree or higher

Massac County 17%

Illinois 37.8%

United States 35.7%

Adults without a high school diploma

9.3%

of adults (25+) without a high school diploma

Massac County 9.3%

Illinois 9.6%

United States 10.4%

School Enrollment

Who is enrolled in school and at what level

School enrollment

2,692

population (age 3+) enrolled in school

Nursery / Preschool

6.9%

K–12

77.7%

College / Undergraduate

14.8%

Graduate / Professional

0.6%

College-going rate (18-24 yr olds)

35.4%

of 18-24-year-olds in college or graduate school

Massac County

35.4%

Illinois

41.4%

United States

40.9%

Enrollment & school type

Enrollment levels, college-going rate, and public vs private school split

Population 3+ currently enrolled in a school

	Massac County	Illinois	United States
Total enrolled (age 3+)	2,692	3,051,569	80,089,790
Nursery / preschool	6.9%	6.3%	5.7%
K–12	77.7%	67.3%	67.6%
Kindergarten	3.2%	4.9%	5%
Elementary: Grades 1–4	18.8%	19.5%	19.8%
Elementary: Grades 5–8	32.8%	20.8%	21%
High School: Grades 9–12	22.9%	22.1%	21.7%
College or graduate school	15.4%	26.4%	26.7%
College, undergraduate	14.8%	19.8%	21%
Graduate, professional school	0.6%	6.6%	5.8%
College-going rate · 18-24 yr olds	35.4%	41.4%	40.9%
School type
Public school	89.3%	80.5%	82%
Private school	10.7%	19.5%	18%

Education Attainment by Level & Gender

What is the highest level of education completed among adults

Education attainment

9,995

population 25 years and over

Total adults (25+)

Less than 9th grade

9th-12th, no diploma

5.3%

HS graduate

32.7%

Some college no degree

28%

Associates degree

12.9%

Bachelors degree

12.5%

Graduate or professional degree

4.6%

Attainment by gender

Male vs Female

Adults (25+) · Share within each education level

% male · % female

Less than 9th grade

48.4% · 51.6%

9th-12th, no diploma

34.3% · 65.7%

HS graduate

52.4% · 47.6%

Some college no degree

47.8% · 52.2%

Associates degree

48.7% · 51.3%

Bachelors degree

40.5% · 59.5%

Graduate or professional degree

58% · 42%

Educational Attainment Overview

Distribution and key education attainment rates for adults (25+)

Highest credential completed · adults 25+

	Massac County	Illinois	United States
Population (25+)	9,995	8,767,004	230,807,303
Less than 9th grade	4%	4.6%	4.7%
9th–12th, no diploma	5.3%	5%	5.7%
High school diploma or GED	32.7%	25.1%	26%
Some college, no degree	28%	19.2%	19.1%
Associate's degree	12.9%	8.3%	8.8%
Bachelor's degree or higher	17%	37.8%	35.7%
Bachelor's degree	12.5%	22.6%	21.6%
Graduate or professional	4.6%	15.3%	14.1%
High School or higher	90.7%	90.5%	89.6%

Earnings by education level

percentage as applicable

Median Earnings

$41,844

Median earnings for adults 25+, by level

Less than HS graduate

$38,145

HS graduate

$33,043

Some college or associates

$40,893

Bachelors degree

$59,705

Graduate or professional degree

$80,391

Poverty Rate

10.6%

for ages 25+, with bachelors degree or higher

Less than HS graduate

23.4%

HS graduate

16.3%

Some college or associates

10.3%

Bachelors degree or higher

10.6%

Outcomes by Education Level

Earnings and poverty rates across education levels (25+)

Adults 25+

	Massac County	Illinois	United States
Median earnings
Population 25+, with earnings	$41,844	$55,582	$52,696
Less than high school graduate	$38,145	$34,655	$32,485
High school graduate (includes equivalency)	$33,043	$40,965	$40,153
Some college or associate's degree	$40,893	$47,813	$47,260
Bachelor's degree	$59,705	$73,326	$70,044
Graduate or professional degree	$80,391	$91,623	$90,720
Poverty rates
Less than high school graduate	23.4%	21.6%	24.2%
High school graduate (includes equivalency)	16.3%	14.4%	14.4%
Some college or associate's degree	10.3%	9.9%	9.8%
Bachelor's degree or higher	10.6%	4.5%	4.5%

Insights for Massac County, by topic

Income By year By race By age By gender

Population By year By race By age By gender

About Neilsberg Research

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