Marshall County, Iowa Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 15th-largest in Iowa
The population of Marshall County, Iowa is 39,971 as of the 2023 American Community Survey, making it the 15th-largest county in Iowa. The median household income is $72,785, the median home value is $134,100, and the median age is 38.7.
The population of Marshall County has declined 0.8% since 2010 (40,722 → 40,392), a -0.06% annualized rate.
39,971
Population
-0.06%
Annual growth
70
People / sq mi
$72,785
Median Income
$134,100
Median Home Value
Marshall County covers 573 sq mi of land at 69.8 people per square mile.
About Marshall County, IA
Marshall County is a county in Iowa with a population of 39,971. It ranks #15 among counties in Iowa by population. The median age is 38.7, in line with the national median. The population is 50.8% male and 49.2% female.
The median household income in Marshall County is $72,785, near the US median of $74,580. 7.7% of residents live below the federal poverty level. Home values sit at a median of $134,100, with monthly rent averaging $860. The homeownership rate of 73.3% is higher than the national rate of 64.8%.
Educational attainment in Marshall County reflects 21.4% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 7.0% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 20.1 minutes each way.
Marshall County Population History (2010-2024)
The county of Marshall County had a population of 40,722 in 2010 and 40,392 in 2024, a -0.8% growth over 14 years. The peak was 41,032 in 2012. Average annual growth rate: -0.06%.
40,392
Population (2024)
40,722
Population (2010)
41,032
Peak (2012)
-0.06%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 40,722 |
| 2011 | 41,013 |
| 2012 | 41,032 |
| 2013 | 40,993 |
| 2014 | 40,712 |
| 2015 | 40,340 |
| 2016 | 40,122 |
| 2017 | 40,051 |
| 2018 | 39,879 |
| 2019 | 39,472 |
| 2020 | 40,091 |
| 2021 | 39,915 |
| 2022 | 39,940 |
| 2023 | 40,230 |
| 2024 | 40,392 |
Race & Ethnicity
| White | 74.6% |
| Black or African American | 1.9% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.9% |
| Two or More Races | 0.0% |
Age & Sex
38.7
Median Age
49.2%
Female
50.8%
Male
18.4%
Age 65+
Age Distribution
Children (under 15): 20.7% · Seniors (65+): 18.4%
Income & Poverty
| Median household income | $72,785$-362 vs state |
| Mean household income | $84,571 |
| Per-capita income | $32,737 |
| Poverty rate | 7.7%+0.8% vs state |
| Unemployment rate | 2.7% |
| Employment-to-population | 63.9% |
Top Industries by Employment
The largest employment sector in Marshall County is manufacturing, accounting for 23.7% of workers.
How residents commute
0.0%
Drive alone
2.9%
Carpool
76.4%
Public transit
7.0%
Work from home
20.1 min
Avg commute
Housing
$134,100$-61,800 vs state
Median home value
$860
Median rent
73.3%
Homeownership rate
16,860
Total housing units
92.2%
Occupied
7.8%
Vacant
26.7%
Renter-occupied
Social & access
94.6%
With health insurance
92.8%
With broadband internet
18.0%
Foreign-born
8.9%
Veterans (18+)
12.2%
With a disability
76.2%
Speak language other than English at home
Education
87.0%
High School+
21.4%
Bachelor's+
Largest cities in Iowa
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Part of Iowa
Metro areas in Iowa
County rankings
Frequently Asked Questions
Marshall County, Iowa has a population of 39,971 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 15th-largest county in Iowa. Population density is 70 people per square mile.
The population of Marshall County has declined 0.8% since 2010 (40,722 → 40,392), a -0.06% annualized rate.
The median household income in Marshall County, Iowa is $72,785, with mean (average) household income of $84,571 and per-capita income of $32,737. 7.7% of residents live below the federal poverty level.
In Marshall County, the largest racial and ethnic groups are White (74.6%), Black or African American (1.9%), Hispanic or Latino (1.9%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Marshall County, Iowa is 38.7 years. Residents are 49.2% female and 50.8% male.
The median home value in Marshall County is $134,100 and median monthly rent is $860. 73.3% of occupied housing units are owner-occupied. The county has 16,860 total housing units, 7.8% of which are vacant.
The largest employment sector in Marshall County, Iowa is manufacturing, employing 23.7% of workers. The unemployment rate is 2.7%.
Des Moines is among the largest cities associated with Marshall County, Iowa, with a population of 212,464.
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Statewide data for Iowa
Population, race, income, age, and trends across Iowa
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.