Demographics of Marion city, Illinois

Marion city, Illinois had 17,148 people on July 1, 2025, by the Census Bureau’s estimate: +312 since July 2020. Age, income, poverty, housing and origin below come from the survey, averaged over 2020–2024, each with its margin of error.

Marion city, in four figures

17,148
Population: July 1, 2025, Vintage 2025 estimate. The survey’s 2020–⁠2024 figure is 16,836 ±34.; +1.9%
Change since July 2020: +312 people.; 42.2 ±2.0
Median age: ACS 2020–⁠2024.; $56,912 ±$6,517
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. The Bureau publishes no births, deaths or migration for a place, so the change is the difference between one July estimate and the next.

Marion city, Illinois's population grew 1.9% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Marion city, 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).

Source: The Census Bureau

About this chart

The figures

Marion city, Illinois's population grew 1.9% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Marion city, 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	16,836	100.0	100.0
2021	16,741	99.4	100.2
2022	16,690	99.1	100.7
2023	16,857	100.1	101.6
2024	17,022	101.1	102.5
2025	17,148	101.9	103.1

Population of Marion city, Illinois on July 1 of each year, Vintage 2025
July 1	Population	Change
2020	16,836	—
2021	16,741	−95
2022	16,690	−51
2023	16,857	+167
2024	17,022	+165
2025	17,148	+126

Age, 2020–2024

The median age is 42.2 ±2.0: for men 40.6 ±2.5 and for women 43.6 ±4.6. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Marion city by age, ACS 2020–2024
Age	People	Share	Illinois	United States
Under 5	760 ±181	4.5% ±1.1	5.4% ±<0.1	5.6% ±<0.1
5 to 17	2,777 ±416	16.5% ±2.5	16.4% ±0.1	16.3% ±<0.1
18 to 24	822 ±192	4.9% ±1.1	9.1% ±<0.1	9.1% ±<0.1
25 to 44	4,586 ±480	27.2% ±2.9	26.9% ±0.1	26.9% ±<0.1
45 to 64	3,928 ±442	23.3% ±2.6	25.2% ±0.1	24.8% ±<0.1
65 and over	3,963 ±451	23.5% ±2.7	17.0% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $56,912 ±$6,517, and income per person $39,024 ±$2,901, 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 Marion city by income, ACS 2020–2024
Household income	Households	Share	Illinois	United States
Under $25,000	1,555 ±311	18.8% ±3.7	14.6% ±0.1	14.6% ±<0.1
$25,000 to $49,999	2,143 ±409	25.9% ±4.8	16.0% ±0.2	16.7% ±<0.1
$50,000 to $74,999	1,263 ±217	15.3% ±2.6	14.8% ±0.1	15.5% ±<0.1
$75,000 to $99,999	827 ±227	10.0% ±2.7	12.6% ±0.1	12.6% ±<0.1
$100,000 to $149,999	1,531 ±301	18.5% ±3.6	18.0% ±0.2	17.5% ±<0.1
$150,000 to $199,999	479 ±160	5.8% ±1.9	10.1% ±0.1	9.6% ±<0.1
$200,000 or more	462 ±159	5.6% ±1.9	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 Marion city by age, ACS 2020–2024
Age	Below poverty	Rate	Illinois	United States
All ages	2,200 ±500	13.3% ±3.0	11.8% ±0.1	12.5% ±0.1
Under 18	586 ±237	16.7% ±6.3	15.1% ±0.2	16.1% ±0.1
18 to 59	1,059 ±214	13.1% ±2.5	11.0% ±0.1	11.6% ±0.1
60 and over	555 ±173	11.4% ±3.3	10.6% ±0.1	11.0% ±<0.1

Housing, 2020–2024

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Housing in Marion city, ACS 2020–2024
Measure	Marion city	Illinois	United States
Housing units	9,050 ±357	5,457,452 ±471	143,775,355 ±10,234
Occupied	91.3% ±0.5	92.3% ±0.1	89.9% ±0.1
Vacant	8.7% ±2.2	7.7% ±0.1	10.1% ±0.1
Owner occupied	63.3% ±4.2	67.1% ±0.3	65.2% ±0.3
Renter occupied	36.7% ±4.0	32.9% ±0.2	34.8% ±0.1
Median home value	$158,300 ±$9,997	$263,300 ±$797	$332,700 ±$236
Median gross rent	$921 ±$60	$1,274 ±$5	$1,413 ±$2
Median year built	1981 ±5	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 Marion city by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Illinois	United States
Hispanic or Latino	450 ±213	2.7% ±1.3	18.8% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	14,225 ±376	84.5% ±2.2	58.1% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	1,345 ±256	8.0% ±1.5	13.3% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	398 ±185	2.4% ±1.1	5.9% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 27	0% to 0.2%	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 15	0% to 0.1%	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	399 ±150	2.4% ±0.9	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 Marion city by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Illinois	United States
Born in the state	12,778 ±546	75.9% ±3.2	66.5% ±0.1	57.3% ±<0.1
Born in another state	3,656 ±496	21.7% ±2.9	17.5% ±0.1	26.9% ±<0.1
Born a citizen outside the states	0 to 20	0% to 0.1%	1.3% ±<0.1	1.7% ±<0.1
Born abroad	395 ±147	2.3% ±0.9	14.7% ±0.1	14.1% ±<0.1
Naturalized citizens	235 ±101	1.4% ±0.6	7.7% ±0.1	7.4% ±<0.1
Not citizens	63 to 257	0.4% 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%.

Marion city among the places of Illinois

151st of 337 places of 5,000 or more by the survey’s 2020–2024 count. Every one is listed on the Illinois page.

Places of Illinois near Marion city in population, ACS 2020–2024
Place	ACS 2020–⁠2024
Godfrey village	17,712 ±27
Hinsdale village	17,175 ±315
Cahokia Heights city	17,106 ±522
Charleston city	17,062 ±622
Bridgeview village	16,849 ±442
Marion city	16,836 ±34
Fairview Heights city	16,745 ±739
Morton village	16,595 ±1,000
Mattoon city	16,586 ±410
Westchester village	16,436 ±33
Country Club Hills city	16,324 ±50

Rankings this appears in

No. 19 Places in Illinois by median age
No. 34 Places in Illinois by poverty rate
No. 133 Places in Illinois by per capita income
No. 178 Places in Illinois by homeownership rate
No. 205 Places in Illinois by median household income
No. 217 Places in Illinois by foreign-born share

Sources

Census Bureau population estimates — incorporated places and New England towns — 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

Compiled automatically from Census Bureau population estimates — incorporated places and New England towns and American Community Survey 5-year estimates — table-based Summary File by a checked SQL query · Editor: Kian O'Connor · How this site is built

Data retrieved September 25, 2026