Demographics of Randolph County, Illinois

Randolph County, Illinois had 29,921 people on July 1, 2025, by the Census Bureau’s estimate: −170 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.

Randolph County, in four figures

29,921
Population: July 1, 2025, Vintage 2025 estimate.; −0.6%
Change since July 2020: −170 people.; 43.7 ±0.5
Median age: ACS 2020–⁠2024.; $68,131 ±$3,611
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.

Randolph County, Illinois's population shrank 0.6% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Randolph 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

Randolph County, Illinois's population shrank 0.6% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Randolph 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	30,091	100.0	100.0
2021	30,215	100.4	100.2
2022	29,942	99.5	100.7
2023	29,805	99.0	101.6
2024	29,870	99.3	102.5
2025	29,921	99.4	103.1

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Population of Randolph 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	30,091	−74	−22	+1	−53
2021	30,215	+124	−150	+21	+239
2022	29,942	−273	−97	+54	−231
2023	29,805	−137	−92	+69	−109
2024	29,870	+65	−108	+141	+36
2025	29,921	+51	−126	+85	+92

Age, 2020–2024

The median age is 43.7 ±0.5: for men 42.7 ±0.7 and for women 45.6 ±0.4. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Randolph County by age, ACS 2020–2024
Age	People	Share	Illinois	United States
Under 5	1,450 ±67	4.8% ±0.2	5.4% ±<0.1	5.6% ±<0.1
5 to 17	4,613 ±274	15.3% ±0.9	16.4% ±0.1	16.3% ±<0.1
18 to 24	2,067 ±187	6.9% ±0.6	9.1% ±<0.1	9.1% ±<0.1
25 to 44	7,302 ±336	24.3% ±1.1	26.9% ±0.1	26.9% ±<0.1
45 to 64	8,233 ±361	27.4% ±1.2	25.2% ±0.1	24.8% ±<0.1
65 and over	6,393 ±360	21.3% ±1.2	17.0% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $68,131 ±$3,611, and income per person $32,715 ±$1,348, 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 Randolph County by income, ACS 2020–2024
Household income	Households	Share	Illinois	United States
Under $25,000	1,987 ±282	16.6% ±2.3	14.6% ±0.1	14.6% ±<0.1
$25,000 to $49,999	2,430 ±291	20.3% ±2.4	16.0% ±0.2	16.7% ±<0.1
$50,000 to $74,999	2,126 ±253	17.8% ±2.1	14.8% ±0.1	15.5% ±<0.1
$75,000 to $99,999	1,608 ±230	13.5% ±1.9	12.6% ±0.1	12.6% ±<0.1
$100,000 to $149,999	2,288 ±266	19.2% ±2.2	18.0% ±0.2	17.5% ±<0.1
$150,000 to $199,999	1,053 ±181	8.8% ±1.5	10.1% ±0.1	9.6% ±<0.1
$200,000 or more	453 ±96	3.8% ±0.8	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 Randolph County by age, ACS 2020–2024
Age	Below poverty	Rate	Illinois	United States
All ages	3,972 ±553	14.6% ±2.0	11.8% ±0.1	12.5% ±0.1
Under 18	1,140 ±246	19.5% ±4.0	15.1% ±0.2	16.1% ±0.1
18 to 59	1,916 ±256	14.5% ±1.9	11.0% ±0.1	11.6% ±0.1
60 and over	916 ±214	11.4% ±2.6	10.6% ±0.1	11.0% ±<0.1

Housing, 2020–2024

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Housing in Randolph County, ACS 2020–2024
Measure	Randolph County	Illinois	United States
Housing units	13,422 ±73	5,457,452 ±471	143,775,355 ±10,234
Occupied	89.0% ±1.6	92.3% ±0.1	89.9% ±0.1
Vacant	11.0% ±1.7	7.7% ±0.1	10.1% ±0.1
Owner occupied	76.6% ±1.8	67.1% ±0.3	65.2% ±0.3
Renter occupied	23.4% ±2.3	32.9% ±0.2	34.8% ±0.1
Median home value	$135,100 ±$10,002	$263,300 ±$797	$332,700 ±$236
Median gross rent	$780 ±$28	$1,274 ±$5	$1,413 ±$2
Median year built	1972 ±2	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 Randolph County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Illinois	United States
Hispanic or Latino	1,147 ±0	3.8% ±<0.1	18.8% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	25,594 ±111	85.1% ±0.4	58.1% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	2,459 ±133	8.2% ±0.4	13.3% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	0 to 400	0% to 1.3%	5.9% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 65	0% to 0.2%	0.1% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 50	0% to 0.2%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	20 to 94	0.1% to 0.3%	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	579 ±254	1.9% ±0.8	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 Randolph County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Illinois	United States
Born in the state	23,245 ±451	77.3% ±1.5	66.5% ±0.1	57.3% ±<0.1
Born in another state	5,972 ±496	19.9% ±1.7	17.5% ±0.1	26.9% ±<0.1
Born a citizen outside the states	53 to 157	0.2% to 0.5%	1.3% ±<0.1	1.7% ±<0.1
Born abroad	736 ±270	2.4% ±0.9	14.7% ±0.1	14.1% ±<0.1
Naturalized citizens	38 to 178	0.1% to 0.6%	7.7% ±0.1	7.4% ±<0.1
Not citizens	628 ±284	2.1% ±0.9	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%.

Randolph County among the counties of Illinois

47th of 102 by population, July 2025. Every one is listed on the Illinois page.

Counties of Illinois near Randolph County in population, July 2025
County	July 2025	Change since 2020
Christian County	33,443	−1.5%
Lee County	32,914	−3.4%
Fulton County	32,901	−2.0%
Morgan County	32,515	−2.9%
Bureau County	32,510	−2.1%
Randolph County	29,921	−0.6%
Montgomery County	28,076	−0.6%
Logan County	27,182	−2.5%
Iroquois County	26,150	−3.0%
McDonough County	25,916	−4.5%
Saline County	22,772	−4.1%

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