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
Homeownership is the standout figure in Marion County: 69.8% of homes are owner-occupied, higher than the national rate. Marion County is a county in Missouri with a population of 28,493. It ranks #39 among counties in Missouri by population.
Household earnings are middling, with a median of $63,908 — below the US median of $78,538. About 9.6% of residents live below the federal poverty level, below the national 12.4%. Homes carry a median value of $158,100, with typical rent around $813.
25.7% of adults 25 and older hold a bachelor’s degree, below the national average of 35.0%. Around 6.1% of workers work from home, below the national 14.0%, and the average commute runs about 18 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.
Marion County, MO Climate
Marion County, MO has an average annual temperature of 11.6°C (53°F) and receives about 993 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
11.6°C
Avg Temp
993
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -4° / 25° | 39 mm |
| February | -1° / 30° | 40 mm |
| March | 6° / 42° | 81 mm |
| April | 12° / 53° | 92 mm |
| May | 17° / 63° | 115 mm |
| June | 23° / 73° | 99 mm |
| July | 25° / 77° | 111 mm |
| August | 24° / 75° | 96 mm |
| September | 19° / 67° | 106 mm |
| October | 13° / 55° | 80 mm |
| November | 6° / 42° | 75 mm |
| December | -1° / 30° | 59 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Marion County, MO
The most comfortable months to visit Marion County, MO are typically June, September and August, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 31°C high). The coldest is January (near -9°C low). May is usually the wettest month.
Where to stay near Marion County
Visiting or relocating to Marion County, MO? Compare hotels and short-term rentals across the county — live availability and prices.
Top-rated places to stay near Marion County
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a move to Marion County?
Get relocation and cost-of-living insights for Marion County, MO by email. No spam, unsubscribe anytime.
More from Missouri
Population 996,618
Population 717,021
Population 409,830
Population 301,121
Full rankings of Missouri counties
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.