Demographics of Marshall County, Iowa

Marshall County, Iowa had 39,890 people on July 1, 2025, by the Census Bureau’s estimate: −210 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.

Marshall County, in four figures

39,890
Population: July 1, 2025, Vintage 2025 estimate.; −0.5%
Change since July 2020: −210 people.; 38.5 ±0.7
Median age: ACS 2020–⁠2024.; $73,315 ±$3,402
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.

Marshall County, Iowa's population shrank 0.5% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Marshall 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

Marshall County, Iowa's population shrank 0.5% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Marshall 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	40,100	100.0	100.0
2021	39,925	99.6	100.2
2022	39,859	99.4	100.7
2023	40,087	100.0	101.6
2024	40,128	100.1	102.5
2025	39,890	99.5	103.1

3 more columns on a wider screen

Population of Marshall 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	40,100	−7	−2	+14	−24
2021	39,925	−175	−71	+121	−239
2022	39,859	−66	−99	+322	−288
2023	40,087	+228	−39	+323	−48
2024	40,128	+41	−28	+306	−233
2025	39,890	−238	−28	+120	−329

Age, 2020–2024

The median age is 38.5 ±0.7: for men 37.7 ±1.2 and for women 39.5 ±0.9. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

2 more columns on a wider screen

People in Marshall County by age, ACS 2020–2024
Age	People	Share	Iowa	United States
Under 5	2,338 ±126	5.8% ±0.3	5.9% ±<0.1	5.6% ±<0.1
5 to 17	7,837 ±414	19.5% ±1.0	17.0% ±0.1	16.3% ±<0.1
18 to 24	3,438 ±346	8.6% ±0.9	10.0% ±0.1	9.1% ±<0.1
25 to 44	9,550 ±454	23.8% ±1.1	25.1% ±0.1	26.9% ±<0.1
45 to 64	9,650 ±461	24.1% ±1.1	23.9% ±0.1	24.8% ±<0.1
65 and over	7,301 ±438	18.2% ±1.1	18.1% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $73,315 ±$3,402, and income per person $33,544 ±$1,288, in 2024 dollars. The median is $75,059 ±$418 in Iowa and $80,734 ±$166 in the United States.

Households by income

2 more columns on a wider screen

Households in Marshall County by income, ACS 2020–2024
Household income	Households	Share	Iowa	United States
Under $25,000	1,933 ±324	12.5% ±2.1	13.9% ±0.2	14.6% ±<0.1
$25,000 to $49,999	3,054 ±346	19.7% ±2.2	18.5% ±0.3	16.7% ±<0.1
$50,000 to $74,999	2,941 ±373	19.0% ±2.4	17.5% ±0.3	15.5% ±<0.1
$75,000 to $99,999	2,674 ±342	17.3% ±2.2	14.0% ±0.3	12.6% ±<0.1
$100,000 to $149,999	3,077 ±379	19.9% ±2.4	18.7% ±0.3	17.5% ±<0.1
$150,000 to $199,999	1,127 ±229	7.3% ±1.5	8.8% ±0.2	9.6% ±<0.1
$200,000 or more	690 ±130	4.5% ±0.8	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).

2 more columns on a wider screen

Poverty rate in Marshall County by age, ACS 2020–2024
Age	Below poverty	Rate	Iowa	United States
All ages	4,333 ±806	11.2% ±2.1	11.1% ±0.2	12.5% ±0.1
Under 18	1,681 ±401	16.9% ±3.9	12.9% ±0.3	16.1% ±0.1
18 to 59	1,686 ±307	8.6% ±1.5	11.4% ±0.3	11.6% ±0.1
60 and over	966 ±212	10.4% ±2.2	8.8% ±0.2	11.0% ±<0.1

Housing, 2020–2024

1 more column on a wider screen

Housing in Marshall County, ACS 2020–2024
Measure	Marshall County	Iowa	United States
Housing units	16,937 ±42	1,437,699 ±523	143,775,355 ±10,234
Occupied	91.5% ±1.6	91.5% ±0.3	89.9% ±0.1
Vacant	8.5% ±1.7	8.5% ±0.3	10.1% ±0.1
Owner occupied	75.0% ±2.0	71.7% ±0.3	65.2% ±0.3
Renter occupied	25.0% ±2.5	28.3% ±0.3	34.8% ±0.1
Median home value	$145,500 ±$6,283	$208,000 ±$1,141	$332,700 ±$236
Median gross rent	$885 ±$55	$972 ±$6	$1,413 ±$2
Median year built	1958 ±2	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

2 more columns on a wider screen

People in Marshall County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Iowa	United States
Hispanic or Latino	9,875 ±0	24.6% ±<0.1	7.3% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	26,461 ±189	66.0% ±0.5	82.3% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	624 ±195	1.6% ±0.5	3.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	1,631 ±174	4.1% ±0.4	2.5% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	42 to 158	0.1% to 0.4%	0.2% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 22	0% to 0.1%	0.2% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	25 to 263	0.1% to 0.7%	0.3% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	1,279 ±301	3.2% ±0.8	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).

2 more columns on a wider screen

People in Marshall County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Iowa	United States
Born in the state	26,855 ±599	66.9% ±1.5	69.6% ±0.2	57.3% ±<0.1
Born in another state	6,904 ±588	17.2% ±1.5	23.8% ±0.2	26.9% ±<0.1
Born a citizen outside the states	245 to 753	0.6% to 1.9%	0.7% ±<0.1	1.7% ±<0.1
Born abroad	5,856 ±547	14.6% ±1.4	5.9% ±0.1	14.1% ±<0.1
Naturalized citizens	2,091 ±389	5.2% ±1.0	2.6% ±0.1	7.4% ±<0.1
Not citizens	3,765 ±627	9.4% ±1.6	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%.

Marshall County among the counties of Iowa

15th of 99 by population, July 2025. Every one is listed on the Iowa page.

Counties of Iowa near Marshall County in population, July 2025
County	July 2025	Change since 2020
Pottawattamie County	92,996	−0.7%
Warren County	57,331	+9.0%
Clinton County	46,002	−0.9%
Cerro Gordo County	42,372	−1.5%
Muscatine County	41,853	−3.0%
Marshall County	39,890	−0.5%
Jasper County	38,153	+0.9%
Des Moines County	38,077	−2.0%
Webster County	36,838	−0.4%
Sioux County	36,774	+2.5%
Wapello County	35,210	−0.4%

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