Demographics of Decatur County, Iowa

Decatur County, Iowa had 7,655 people on July 1, 2025, by the Census Bureau’s estimate: −73 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.

Decatur County, in four figures

7,655
Population: July 1, 2025, Vintage 2025 estimate.; −0.9%
Change since July 2020: −73 people.; 36.1 ±0.6
Median age: ACS 2020–⁠2024.; $59,044 ±$4,382
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.

Decatur County, Iowa's population shrank 0.9% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Decatur 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).

Source: The Census Bureau

About this chart

The figures

Decatur County, Iowa's population shrank 0.9% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Decatur 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	7,728	100.0	100.0
2021	7,796	100.9	100.2
2022	7,807	101.0	100.7
2023	7,777	100.6	101.6
2024	7,675	99.3	102.5
2025	7,655	99.1	103.1

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Population of Decatur 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	7,728	−34	−11	0	−21
2021	7,796	+68	−10	+6	+69
2022	7,807	+11	−23	+9	+33
2023	7,777	−30	−19	+16	−27
2024	7,675	−102	−3	+6	−103
2025	7,655	−20	−1	+5	−24

Age, 2020–2024

The median age is 36.1 ±0.6: for men 34.1 ±1.4 and for women 38.6 ±1.9. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Decatur County by age, ACS 2020–2024
Age	People	Share	Iowa	United States
Under 5	422 ±18	5.4% ±0.2	5.9% ±<0.1	5.6% ±<0.1
5 to 17	1,299 ±88	16.7% ±1.1	17.0% ±0.1	16.3% ±<0.1
18 to 24	1,259 ±156	16.2% ±2.0	10.0% ±0.1	9.1% ±<0.1
25 to 44	1,506 ±104	19.4% ±1.3	25.1% ±0.1	26.9% ±<0.1
45 to 64	1,634 ±107	21.1% ±1.4	23.9% ±0.1	24.8% ±<0.1
65 and over	1,639 ±127	21.1% ±1.6	18.1% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $59,044 ±$4,382, and income per person $30,020 ±$2,558, 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 Decatur County by income, ACS 2020–2024
Household income	Households	Share	Iowa	United States
Under $25,000	595 ±107	19.5% ±3.4	13.9% ±0.2	14.6% ±<0.1
$25,000 to $49,999	687 ±99	22.5% ±3.1	18.5% ±0.3	16.7% ±<0.1
$50,000 to $74,999	682 ±137	22.3% ±4.4	17.5% ±0.3	15.5% ±<0.1
$75,000 to $99,999	374 ±75	12.2% ±2.4	14.0% ±0.3	12.6% ±<0.1
$100,000 to $149,999	495 ±85	16.2% ±2.7	18.7% ±0.3	17.5% ±<0.1
$150,000 to $199,999	119 ±37	3.9% ±1.2	8.8% ±0.2	9.6% ±<0.1
$200,000 or more	103 ±32	3.4% ±1.0	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 Decatur County by age, ACS 2020–2024
Age	Below poverty	Rate	Iowa	United States
All ages	1,034 ±196	14.6% ±2.8	11.1% ±0.2	12.5% ±0.1
Under 18	328 ±93	20.1% ±5.4	12.9% ±0.3	16.1% ±0.1
18 to 59	434 ±100	12.6% ±2.8	11.4% ±0.3	11.6% ±0.1
60 and over	272 ±82	13.5% ±4.0	8.8% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Decatur County, ACS 2020–2024
Measure	Decatur County	Iowa	United States
Housing units	3,659 ±32	1,437,699 ±523	143,775,355 ±10,234
Occupied	83.5% ±3.2	91.5% ±0.3	89.9% ±0.1
Vacant	16.5% ±3.2	8.5% ±0.3	10.1% ±0.1
Owner occupied	69.7% ±2.7	71.7% ±0.3	65.2% ±0.3
Renter occupied	30.3% ±5.0	28.3% ±0.3	34.8% ±0.1
Median home value	$113,900 ±$6,899	$208,000 ±$1,141	$332,700 ±$236
Median gross rent	$611 ±$76	$972 ±$6	$1,413 ±$2
Median year built	1970 ±3	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 Decatur County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Iowa	United States
Hispanic or Latino	274 ±0	3.5% ±<0.1	7.3% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	6,997 ±58	90.2% ±0.7	82.3% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	100 ±38	1.3% ±0.5	3.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	26 to 86	0.3% to 1.1%	2.5% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 32	0% to 0.4%	0.2% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 4	0% to 0.1%	0.2% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	10 to 86	0.1% to 1.1%	0.3% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	267 ±74	3.4% ±1.0	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 Decatur County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Iowa	United States
Born in the state	5,371 ±206	69.2% ±2.7	69.6% ±0.2	57.3% ±<0.1
Born in another state	2,217 ±199	28.6% ±2.6	23.8% ±0.2	26.9% ±<0.1
Born a citizen outside the states	10 to 40	0.1% to 0.5%	0.7% ±<0.1	1.7% ±<0.1
Born abroad	146 ±54	1.9% ±0.7	5.9% ±0.1	14.1% ±<0.1
Naturalized citizens	9 to 61	0.1% to 0.8%	2.6% ±0.1	7.4% ±<0.1
Not citizens	111 ±47	1.4% ±0.6	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%.

Decatur County among the counties of Iowa

86th of 99 by population, July 2025. Every one is listed on the Iowa page.

Counties of Iowa near Decatur County in population, July 2025
County	July 2025	Change since 2020
Emmet County	9,107	−2.5%
Palo Alto County	8,899	−1.0%
Lucas County	8,847	+2.6%
Greene County	8,658	−1.0%
Monona County	8,539	−2.4%
Decatur County	7,655	−0.9%
Monroe County	7,406	−2.6%
Adair County	7,403	−1.3%
Worth County	7,338	−1.3%
Van Buren County	7,131	−1.2%
Pocahontas County	6,819	−3.6%

Elsewhere on the site

Rankings this appears in

No. 50 Counties by population growth in Iowa
No. 86 Counties by population in Iowa

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

Compiled automatically from Census Bureau population estimates — counties and Puerto Rico municipios, with components of change 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