Demographics of Delaware County, Iowa

Delaware County, Iowa had 17,674 people on July 1, 2025, by the Census Bureau’s estimate: +218 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.

Delaware County, in four figures

17,674
Population: July 1, 2025, Vintage 2025 estimate.; +1.2%
Change since July 2020: +218 people.; 43.4 ±0.4
Median age: ACS 2020–⁠2024.; $74,989 ±$6,892
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.

Delaware County, Iowa's population grew 1.2% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Delaware County, 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).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Delaware County, Iowa's population grew 1.2% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Delaware County, 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	17,456	100.0	100.0
2021	17,554	100.6	100.2
2022	17,590	100.8	100.7
2023	17,572	100.7	101.6
2024	17,602	100.8	102.5
2025	17,674	101.2	103.1

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Population of Delaware County, Iowa on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	17,456	−25	0	0	−24
2021	17,554	+98	+2	+2	+81
2022	17,590	+36	−10	+5	+53
2023	17,572	−18	+5	+6	−28
2024	17,602	+30	+7	+1	+25
2025	17,674	+72	−11	−1	+86

Age, 2020–2024

The median age is 43.4 ±0.4: for men 43.1 ±1.0 and for women 44.3 ±0.7. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Delaware County by age, ACS 2020–2024
Age	People	Share	Iowa	United States
Under 5	1,025 ±26	5.8% ±0.2	5.9% ±<0.1	5.6% ±<0.1
5 to 17	3,059 ±206	17.4% ±1.2	17.0% ±0.1	16.3% ±<0.1
18 to 24	1,241 ±192	7.1% ±1.1	10.0% ±0.1	9.1% ±<0.1
25 to 44	3,753 ±210	21.4% ±1.2	25.1% ±0.1	26.9% ±<0.1
45 to 64	4,696 ±272	26.7% ±1.6	23.9% ±0.1	24.8% ±<0.1
65 and over	3,784 ±333	21.6% ±1.9	18.1% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $74,989 ±$6,892, and income per person $41,445 ±$3,743, 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 Delaware County by income, ACS 2020–2024
Household income	Households	Share	Iowa	United States
Under $25,000	940 ±192	12.8% ±2.6	13.9% ±0.2	14.6% ±<0.1
$25,000 to $49,999	1,431 ±238	19.4% ±3.2	18.5% ±0.3	16.7% ±<0.1
$50,000 to $74,999	1,314 ±271	17.8% ±3.6	17.5% ±0.3	15.5% ±<0.1
$75,000 to $99,999	1,242 ±201	16.9% ±2.7	14.0% ±0.3	12.6% ±<0.1
$100,000 to $149,999	1,247 ±199	16.9% ±2.7	18.7% ±0.3	17.5% ±<0.1
$150,000 to $199,999	681 ±158	9.2% ±2.1	8.8% ±0.2	9.6% ±<0.1
$200,000 or more	514 ±152	7.0% ±2.1	8.6% ±0.2	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 Delaware County by age, ACS 2020–2024
Age	Below poverty	Rate	Iowa	United States
All ages	1,349 ±268	7.8% ±1.5	11.1% ±0.2	12.5% ±0.1
Under 18	227 ±100	5.6% ±2.4	12.9% ±0.3	16.1% ±0.1
18 to 59	541 ±155	6.6% ±1.9	11.4% ±0.3	11.6% ±0.1
60 and over	581 ±167	11.3% ±3.2	8.8% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Delaware County, ACS 2020–2024
Measure	Delaware County	Iowa	United States
Housing units	8,169 ±29	1,437,699 ±523	143,775,355 ±10,234
Occupied	90.2% ±2.6	91.5% ±0.3	89.9% ±0.1
Vacant	9.8% ±2.6	8.5% ±0.3	10.1% ±0.1
Owner occupied	79.6% ±2.0	71.7% ±0.3	65.2% ±0.3
Renter occupied	20.4% ±3.0	28.3% ±0.3	34.8% ±0.1
Median home value	$177,900 ±$16,526	$208,000 ±$1,141	$332,700 ±$236
Median gross rent	$764 ±$86	$972 ±$6	$1,413 ±$2
Median year built	1967 ±5	1972 ±1	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 Delaware County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Iowa	United States
Hispanic or Latino	301 ±0	1.7% ±<0.1	7.3% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	16,514 ±245	94.1% ±1.4	82.3% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	0 to 33	0% to 0.2%	3.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	0 to 16	0% to 0.1%	2.5% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	2 to 46	< 0.1% to 0.3%	0.2% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 16	0% to 0.1%	0.2% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 127	0% to 0.7%	0.3% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	650 ±222	3.7% ±1.3	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 Delaware County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Iowa	United States
Born in the state	15,420 ±367	87.8% ±2.1	69.6% ±0.2	57.3% ±<0.1
Born in another state	2,010 ±375	11.4% ±2.1	23.8% ±0.2	26.9% ±<0.1
Born a citizen outside the states	7 to 135	< 0.1% to 0.8%	0.7% ±<0.1	1.7% ±<0.1
Born abroad	15 to 99	0.1% to 0.6%	5.9% ±0.1	14.1% ±<0.1
Naturalized citizens	0 to 9	0% to 0.1%	2.6% ±0.1	7.4% ±<0.1
Not citizens	13 to 95	0.1% to 0.5%	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%.

Delaware County among the counties of Iowa

40th of 99 by population, July 2025. Every one is listed on the Iowa page.

Counties of Iowa near Delaware County in population, July 2025
County	July 2025	Change since 2020
Jackson County	19,288	−0.8%
Fayette County	19,047	−2.1%
Poweshiek County	18,368	−1.4%
Cedar County	18,359	−0.7%
Dickinson County	18,077	+1.7%
Delaware County	17,674	+1.2%
Madison County	17,270	+3.8%
Clayton County	16,845	−1.1%
Tama County	16,796	−1.5%
Iowa County	16,504	−1.0%
Hardin County	16,455	−2.2%

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