Demographics of Denison city, Iowa

Denison city, Iowa had 8,214 people on July 1, 2025, by the Census Bureau’s estimate: −146 since July 2020. Age, income, poverty, housing and origin below come from the survey, averaged over 2020–2024, each with its margin of error.

Denison city, in four figures

8,214
Population: July 1, 2025, Vintage 2025 estimate. The survey’s 2020–⁠2024 figure is 8,260 ±24.; −1.7%
Change since July 2020: −146 people.; 34.3 ±2.6
Median age: ACS 2020–⁠2024.; $65,684 ±$4,361
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.

Denison city, Iowa's population shrank 1.7% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Denison city, Iowa'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

Denison city, Iowa's population shrank 1.7% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Denison city, Iowa'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	8,360	100.0	100.0
2021	8,234	98.5	100.2
2022	8,188	97.9	100.7
2023	8,174	97.8	101.6
2024	8,245	98.6	102.5
2025	8,214	98.3	103.1

Population of Denison city, Iowa on July 1 of each year, Vintage 2025
July 1	Population	Change
2020	8,360	—
2021	8,234	−126
2022	8,188	−46
2023	8,174	−14
2024	8,245	+71
2025	8,214	−31

Age, 2020–2024

The median age is 34.3 ±2.6: for men 32.9 ±3.2 and for women 35.0 ±4.5. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Denison city by age, ACS 2020–2024
Age	People	Share	Iowa	United States
Under 5	526 ±95	6.4% ±1.2	5.9% ±<0.1	5.6% ±<0.1
5 to 17	1,635 ±283	19.8% ±3.4	17.0% ±0.1	16.3% ±<0.1
18 to 24	957 ±245	11.6% ±3.0	10.0% ±0.1	9.1% ±<0.1
25 to 44	2,077 ±316	25.1% ±3.8	25.1% ±0.1	26.9% ±<0.1
45 to 64	1,956 ±320	23.7% ±3.9	23.9% ±0.1	24.8% ±<0.1
65 and over	1,109 ±192	13.4% ±2.3	18.1% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $65,684 ±$4,361, and income per person $29,674 ±$2,954, in 2024 dollars. The median is $75,059 ±$418 in Iowa and $80,734 ±$166 in the United States.

Households by income

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Households in Denison city by income, ACS 2020–2024
Household income	Households	Share	Iowa	United States
Under $25,000	577 ±171	18.7% ±5.4	13.9% ±0.2	14.6% ±<0.1
$25,000 to $49,999	635 ±201	20.5% ±6.4	18.5% ±0.3	16.7% ±<0.1
$50,000 to $74,999	603 ±187	19.5% ±5.9	17.5% ±0.3	15.5% ±<0.1
$75,000 to $99,999	308 ±148	10.0% ±4.7	14.0% ±0.3	12.6% ±<0.1
$100,000 to $149,999	623 ±221	20.2% ±7.0	18.7% ±0.3	17.5% ±<0.1
$150,000 to $199,999	91 to 331	3.0% to 10.7%	8.8% ±0.2	9.6% ±<0.1
$200,000 or more	25 to 243	0.8% to 7.9%	8.6% ±0.2	13.4% ±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%.

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 Denison city by age, ACS 2020–2024
Age	Below poverty	Rate	Iowa	United States
All ages	1,423 ±372	17.5% ±4.6	11.1% ±0.2	12.5% ±0.1
Under 18	397 ±177	18.4% ±7.7	12.9% ±0.3	16.1% ±0.1
18 to 59	874 ±247	19.1% ±5.2	11.4% ±0.3	11.6% ±0.1
60 and over	53 to 251	4.0% to 17.9%	8.8% ±0.2	11.0% ±<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%.

Housing, 2020–2024

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Housing in Denison city, ACS 2020–2024
Measure	Denison city	Iowa	United States
Housing units	3,251 ±151	1,437,699 ±523	143,775,355 ±10,234
Occupied	95.1% ±4.1	91.5% ±0.3	89.9% ±0.1
Vacant	0.9% to 9.0%	8.5% ±0.3	10.1% ±0.1
Owner occupied	71.3% ±4.9	71.7% ±0.3	65.2% ±0.3
Renter occupied	28.7% ±6.3	28.3% ±0.3	34.8% ±0.1
Median home value	$150,200 ±$18,669	$208,000 ±$1,141	$332,700 ±$236
Median gross rent	$731 ±$102	$972 ±$6	$1,413 ±$2
Median year built	1974 ±2	1972 ±1	1980 ±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%.

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 Denison city by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Iowa	United States
Hispanic or Latino	4,029 ±352	48.8% ±4.3	7.3% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	3,540 ±338	42.9% ±4.1	82.3% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	13 to 233	0.2% to 2.8%	3.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	274 ±101	3.3% ±1.2	2.5% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 15	0% to 0.2%	0.2% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 15	0% to 0.2%	0.2% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 24	0% to 0.3%	0.3% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	285 ±126	3.5% ±1.5	3.5% ±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 Denison city by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Iowa	United States
Born in the state	3,884 ±434	47.0% ±5.3	69.6% ±0.2	57.3% ±<0.1
Born in another state	1,734 ±429	21.0% ±5.2	23.8% ±0.2	26.9% ±<0.1
Born a citizen outside the states	6 to 176	0.1% to 2.1%	0.7% ±<0.1	1.7% ±<0.1
Born abroad	2,551 ±380	30.9% ±4.6	5.9% ±0.1	14.1% ±<0.1
Naturalized citizens	1,190 ±291	14.4% ±3.5	2.6% ±0.1	7.4% ±<0.1
Not citizens	1,361 ±449	16.5% ±5.4	3.3% ±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%.

Denison city among the places of Iowa

49th of 86 places of 5,000 or more by the survey’s 2020–2024 count. Every one is listed on the Iowa page.

Places of Iowa near Denison city in population, ACS 2020–2024
Place	ACS 2020–⁠2024
Grinnell city	9,505 ±52
Fairfield city	9,456 ±18
Mount Pleasant city	8,951 ±39
Bondurant city	8,560 ±18
Sioux Center city	8,454 ±26
Denison city	8,260 ±24
Perry city	7,985 ±21
Webster City city	7,769 ±24
Clear Lake city	7,607 ±20
Decorah city	7,535 ±37
Knoxville city	7,473 ±27

Rankings this appears in

No. 1 Places in Iowa by foreign-born share
No. 1 Places in Iowa by Hispanic or Latino share
No. 3 Places in Iowa by poverty rate
No. 6 Places in Iowa by homeownership rate
No. 29 Places in Iowa by median household income
No. 34 Places in Iowa by median age

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