Demographics of Clark County, Illinois

Clark County, Illinois had 15,114 people on July 1, 2025, by the Census Bureau’s estimate: −342 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.

Clark County, in four figures

15,114
Population: July 1, 2025, Vintage 2025 estimate.; −2.2%
Change since July 2020: −342 people.; 42.6 ±0.8
Median age: ACS 2020–⁠2024.; $72,927 ±$4,958
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.

Clark County, Illinois's population shrank 2.2% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Clark 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

Clark County, Illinois's population shrank 2.2% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Clark 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	15,456	100.0	100.0
2021	15,384	99.5	100.2
2022	15,218	98.5	100.7
2023	15,235	98.6	101.6
2024	15,141	98.0	102.5
2025	15,114	97.8	103.1

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Population of Clark 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	15,456	−31	+5	0	−34
2021	15,384	−72	−54	0	−27
2022	15,218	−166	−80	−4	−74
2023	15,235	+17	−63	+14	+70
2024	15,141	−94	−78	+30	−46
2025	15,114	−27	−98	+22	+49

Age, 2020–2024

The median age is 42.6 ±0.8: for men 40.8 ±1.0 and for women 43.8 ±0.5. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Clark County by age, ACS 2020–2024
Age	People	Share	Illinois	United States
Under 5	855 ±41	5.6% ±0.3	5.4% ±<0.1	5.6% ±<0.1
5 to 17	2,557 ±227	16.7% ±1.5	16.4% ±0.1	16.3% ±<0.1
18 to 24	1,078 ±181	7.1% ±1.2	9.1% ±<0.1	9.1% ±<0.1
25 to 44	3,542 ±169	23.2% ±1.1	26.9% ±0.1	26.9% ±<0.1
45 to 64	4,139 ±241	27.1% ±1.6	25.2% ±0.1	24.8% ±<0.1
65 and over	3,095 ±255	20.3% ±1.7	17.0% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $72,927 ±$4,958, and income per person $37,528 ±$2,437, 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 Clark County by income, ACS 2020–2024
Household income	Households	Share	Illinois	United States
Under $25,000	1,001 ±203	15.3% ±3.1	14.6% ±0.1	14.6% ±<0.1
$25,000 to $49,999	1,268 ±220	19.3% ±3.3	16.0% ±0.2	16.7% ±<0.1
$50,000 to $74,999	1,113 ±177	17.0% ±2.7	14.8% ±0.1	15.5% ±<0.1
$75,000 to $99,999	1,076 ±221	16.4% ±3.3	12.6% ±0.1	12.6% ±<0.1
$100,000 to $149,999	1,275 ±212	19.5% ±3.2	18.0% ±0.2	17.5% ±<0.1
$150,000 to $199,999	501 ±138	7.6% ±2.1	10.1% ±0.1	9.6% ±<0.1
$200,000 or more	321 ±107	4.9% ±1.6	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 Clark County by age, ACS 2020–2024
Age	Below poverty	Rate	Illinois	United States
All ages	1,366 ±283	9.1% ±1.9	11.8% ±0.1	12.5% ±0.1
Under 18	317 ±104	9.4% ±3.0	15.1% ±0.2	16.1% ±0.1
18 to 59	736 ±197	9.7% ±2.6	11.0% ±0.1	11.6% ±0.1
60 and over	313 ±99	7.9% ±2.4	10.6% ±0.1	11.0% ±<0.1

Housing, 2020–2024

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Housing in Clark County, ACS 2020–2024
Measure	Clark County	Illinois	United States
Housing units	7,307 ±37	5,457,452 ±471	143,775,355 ±10,234
Occupied	89.7% ±2.6	92.3% ±0.1	89.9% ±0.1
Vacant	10.3% ±2.6	7.7% ±0.1	10.1% ±0.1
Owner occupied	80.3% ±3.3	67.1% ±0.3	65.2% ±0.3
Renter occupied	19.7% ±3.6	32.9% ±0.2	34.8% ±0.1
Median home value	$132,400 ±$15,582	$263,300 ±$797	$332,700 ±$236
Median gross rent	$861 ±$89	$1,274 ±$5	$1,413 ±$2
Median year built	1971 ±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 Clark County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Illinois	United States
Hispanic or Latino	285 ±0	1.9% ±<0.1	18.8% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	14,503 ±58	95.0% ±0.4	58.1% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	30 to 110	0.2% to 0.7%	13.3% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	0 to 39	0% to 0.3%	5.9% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 15	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 20	0% to 0.1%	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	383 ±69	2.5% ±0.5	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 Clark County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Illinois	United States
Born in the state	6,834 ±505	44.8% ±3.3	66.5% ±0.1	57.3% ±<0.1
Born in another state	8,193 ±514	53.7% ±3.4	17.5% ±0.1	26.9% ±<0.1
Born a citizen outside the states	4 to 72	< 0.1% to 0.5%	1.3% ±<0.1	1.7% ±<0.1
Born abroad	95 to 307	0.6% to 2.0%	14.7% ±0.1	14.1% ±<0.1
Naturalized citizens	27 to 133	0.2% to 0.9%	7.7% ±0.1	7.4% ±<0.1
Not citizens	19 to 223	0.1% to 1.5%	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%.

Clark County among the counties of Illinois

71st of 102 by population, July 2025. Every one is listed on the Illinois page.

Counties of Illinois near Clark County in population, July 2025
County	July 2025	Change since 2020
Wayne County	15,882	−1.6%
Carroll County	15,419	−1.7%
Mercer County	15,229	−2.6%
Richland County	15,219	−3.7%
De Witt County	15,118	−2.1%
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%

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