Demographics of Monona County, Iowa

Monona County, Iowa had 8,539 people on July 1, 2025, by the Census Bureau’s estimate: −207 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.

Monona County, in four figures

8,539
Population: July 1, 2025, Vintage 2025 estimate.; −2.4%
Change since July 2020: −207 people.; 43.7 ±0.8
Median age: ACS 2020–⁠2024.; $68,377 ±$6,651
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.

Monona County, Iowa's population shrank 2.4% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Monona 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

Monona County, Iowa's population shrank 2.4% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Monona 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	8,746	100.0	100.0
2021	8,609	98.4	100.2
2022	8,527	97.5	100.7
2023	8,539	97.6	101.6
2024	8,492	97.1	102.5
2025	8,539	97.6	103.1

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Population of Monona 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	8,746	−10	−20	0	+8
2021	8,609	−137	−84	+2	−61
2022	8,527	−82	−60	+6	−26
2023	8,539	+12	−26	+1	+38
2024	8,492	−47	−10	+2	−37
2025	8,539	+47	−14	−2	+64

Age, 2020–2024

The median age is 43.7 ±0.8: for men 42.6 ±0.7 and for women 45.6 ±1.0. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Monona County by age, ACS 2020–2024
Age	People	Share	Iowa	United States
Under 5	447 ±14	5.2% ±0.2	5.9% ±<0.1	5.6% ±<0.1
5 to 17	1,488 ±128	17.4% ±1.5	17.0% ±0.1	16.3% ±<0.1
18 to 24	524 ±75	6.1% ±0.9	10.0% ±0.1	9.1% ±<0.1
25 to 44	1,876 ±133	21.9% ±1.6	25.1% ±0.1	26.9% ±<0.1
45 to 64	2,138 ±125	25.0% ±1.5	23.9% ±0.1	24.8% ±<0.1
65 and over	2,084 ±161	24.4% ±1.9	18.1% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $68,377 ±$6,651, and income per person $35,795 ±$1,620, 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 Monona County by income, ACS 2020–2024
Household income	Households	Share	Iowa	United States
Under $25,000	581 ±103	15.0% ±2.6	13.9% ±0.2	14.6% ±<0.1
$25,000 to $49,999	900 ±140	23.2% ±3.6	18.5% ±0.3	16.7% ±<0.1
$50,000 to $74,999	651 ±119	16.8% ±3.0	17.5% ±0.3	15.5% ±<0.1
$75,000 to $99,999	605 ±127	15.6% ±3.2	14.0% ±0.3	12.6% ±<0.1
$100,000 to $149,999	715 ±118	18.4% ±3.0	18.7% ±0.3	17.5% ±<0.1
$150,000 to $199,999	226 ±74	5.8% ±1.9	8.8% ±0.2	9.6% ±<0.1
$200,000 or more	200 ±49	5.2% ±1.3	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 Monona County by age, ACS 2020–2024
Age	Below poverty	Rate	Iowa	United States
All ages	888 ±248	10.6% ±3.0	11.1% ±0.2	12.5% ±0.1
Under 18	232 ±96	12.3% ±5.0	12.9% ±0.3	16.1% ±0.1
18 to 59	317 ±101	8.5% ±2.7	11.4% ±0.3	11.6% ±0.1
60 and over	339 ±87	12.4% ±3.1	8.8% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Monona County, ACS 2020–2024
Measure	Monona County	Iowa	United States
Housing units	4,372 ±43	1,437,699 ±523	143,775,355 ±10,234
Occupied	88.7% ±2.5	91.5% ±0.3	89.9% ±0.1
Vacant	11.3% ±2.3	8.5% ±0.3	10.1% ±0.1
Owner occupied	75.7% ±3.3	71.7% ±0.3	65.2% ±0.3
Renter occupied	24.3% ±3.3	28.3% ±0.3	34.8% ±0.1
Median home value	$142,900 ±$13,872	$208,000 ±$1,141	$332,700 ±$236
Median gross rent	$855 ±$72	$972 ±$6	$1,413 ±$2
Median year built	1956 ±4	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 Monona County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Iowa	United States
Hispanic or Latino	233 ±0	2.7% ±<0.1	7.3% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	7,944 ±18	92.8% ±0.2	82.3% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	0 to 46	0% to 0.5%	3.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	0 to 15	0% to 0.2%	2.5% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 77	0% to 0.9%	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 3	0% to < 0.1%	0.3% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	321 ±53	3.8% ±0.6	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 Monona County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Iowa	United States
Born in the state	6,535 ±160	76.4% ±1.9	69.6% ±0.2	57.3% ±<0.1
Born in another state	1,959 ±168	22.9% ±2.0	23.8% ±0.2	26.9% ±<0.1
Born a citizen outside the states	1 to 11	< 0.1% to 0.1%	0.7% ±<0.1	1.7% ±<0.1
Born abroad	24 to 90	0.3% to 1.1%	5.9% ±0.1	14.1% ±<0.1
Naturalized citizens	20 to 86	0.2% to 1.0%	2.6% ±0.1	7.4% ±<0.1
Not citizens	0 to 14	0% to 0.2%	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%.

Monona County among the counties of Iowa

85th of 99 by population, July 2025. Every one is listed on the Iowa page.

Counties of Iowa near Monona County in population, July 2025
County	July 2025	Change since 2020
Davis County	9,230	+1.3%
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%

Elsewhere on the site

Rankings this appears in

No. 78 Counties by population growth in Iowa
No. 85 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