Marion County, Missouri Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 39th-largest in Missouri
The population of Marion County, Missouri is 28,493 as of the 2023 American Community Survey, making it the 39th-largest county in Missouri. The median household income is $63,908, the median home value is $158,100, and the median age is 39.4.
The population of Marion County has declined 1.3% since 2010 (28,785 → 28,425), a -0.09% annualized rate.
28,493
Population
-0.09%
Annual growth
65
People / sq mi
$63,908
Median Income
$158,100
Median Home Value
Marion County covers 437 sq mi of land at 65.2 people per square mile.
About Marion County, MO
Marion County is a county in Missouri with a population of 28,493. It ranks #39 among counties in Missouri by population. The median age is 39.4, in line with the national median. The population is 48.6% male and 51.4% female.
The median household income in Marion County is $63,908, below the US median of $74,580. 9.6% of residents live below the federal poverty level. Home values sit at a median of $158,100, with monthly rent averaging $813. The homeownership rate of 69.8% is higher than the national rate of 64.8%.
Educational attainment in Marion County reflects 25.7% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 6.1% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 17.9 minutes each way.
Marion County Population History (2010-2024)
The county of Marion County had a population of 28,785 in 2010 and 28,425 in 2024, a -1.3% growth over 14 years. The peak was 28,786 in 2011. Average annual growth rate: -0.09%.
28,425
Population (2024)
28,785
Population (2010)
28,786
Peak (2011)
-0.09%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 28,785 |
| 2011 | 28,786 |
| 2012 | 28,753 |
| 2013 | 28,781 |
| 2014 | 28,784 |
| 2015 | 28,719 |
| 2016 | 28,721 |
| 2017 | 28,607 |
| 2018 | 28,564 |
| 2019 | 28,543 |
| 2020 | 28,493 |
| 2021 | 28,564 |
| 2022 | 28,489 |
| 2023 | 28,312 |
| 2024 | 28,425 |
Race & Ethnicity
| White | 89.6% |
| Black or African American | 5.2% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.9% |
| Two or More Races | 0.0% |
Age & Sex
39.4
Median Age
51.4%
Female
48.6%
Male
18.6%
Age 65+
Age Distribution
Children (under 15): 19.7% · Seniors (65+): 18.6%
Income & Poverty
| Median household income | $63,908$-5,012 vs state |
| Mean household income | $77,702 |
| Per-capita income | $30,958 |
| Poverty rate | 9.6%+1.2% vs state |
| Unemployment rate | 2.1% |
| Employment-to-population | 57.3% |
Top Industries by Employment
The largest employment sector in Marion County is professional & business services, accounting for 28.4% of workers.
How residents commute
0.3%
Drive alone
3.7%
Carpool
77.9%
Public transit
6.1%
Work from home
17.9 min
Avg commute
Housing
$158,100$-57,500 vs state
Median home value
$813
Median rent
69.8%
Homeownership rate
12,886
Total housing units
87.3%
Occupied
12.7%
Vacant
30.2%
Renter-occupied
Social & access
92.1%
With health insurance
92.7%
With broadband internet
31.3%
Foreign-born
7.8%
Veterans (18+)
15.7%
With a disability
99.2%
Speak language other than English at home
Education
90.4%
High School+
25.7%
Bachelor's+
Largest cities in Missouri
Other counties in Missouri
Part of Missouri
Metro areas in Missouri
County rankings
Frequently Asked Questions
Marion County, Missouri has a population of 28,493 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 39th-largest county in Missouri. Population density is 65 people per square mile.
The population of Marion County has declined 1.3% since 2010 (28,785 → 28,425), a -0.09% annualized rate.
The median household income in Marion County, Missouri is $63,908, with mean (average) household income of $77,702 and per-capita income of $30,958. 9.6% of residents live below the federal poverty level.
In Marion County, the largest racial and ethnic groups are White (89.6%), Black or African American (5.2%), 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 Marion County, Missouri is 39.4 years. Residents are 51.4% female and 48.6% male.
The median home value in Marion County is $158,100 and median monthly rent is $813. 69.8% of occupied housing units are owner-occupied. The county has 12,886 total housing units, 12.7% of which are vacant.
The largest employment sector in Marion County, Missouri is professional, scientific, and management services, employing 28.4% of workers. The unemployment rate is 2.1%.
Kansas City is among the largest cities associated with Marion County, Missouri, with a population of 508,233.
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Statewide data for Missouri
Population, race, income, age, and trends across Missouri
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.