Marion County, Kansas Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 37th-largest in Kansas
The population of Marion County, Kansas is 11,795 as of the 2023 American Community Survey, making it the 37th-largest county in Kansas. The median household income is $63,438, the median home value is $114,400, and the median age is 43.7.
The population of Marion County has declined 7.9% since 2010 (12,671 → 11,670), a -0.59% annualized rate.
11,795
Population
-0.59%
Annual growth
12
People / sq mi
$63,438
Median Income
$114,400
Median Home Value
Marion County covers 944 sq mi of land at 12.5 people per square mile.
About Marion County, KS
Homeownership is the standout figure in Marion County: 80.8% of homes are owner-occupied, higher than the national rate. With 11,795 residents, Marion County is a county in Kansas. It ranks #37 among counties in Kansas by population.
Median household income is $63,438, below the US median of $78,538. Poverty is relatively low for US counties at 6.2%, below the national 12.4%. Housing is relatively affordable, with a median home value of $114,400, with typical rent around $727.
About 28.8% of adults 25 and older have a bachelor’s degree, below the 35.0% national figure. Around 9.5% of workers work from home, below the national 14.0%, and the average commute runs about 23 minutes each way.
The ownership rate anchors the housing story in Marion County, and tends to move with the age structure and home-value figures above.
Marion County Population History (2010-2024)
The county of Marion County had a population of 12,671 in 2010 and 11,670 in 2024, a -7.9% growth over 14 years. The peak was 12,671 in 2010. Average annual growth rate: -0.58%.
11,670
Population (2024)
12,671
Population (2010)
12,671
Peak (2010)
-0.58%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 12,671 |
| 2011 | 12,546 |
| 2012 | 12,378 |
| 2013 | 12,206 |
| 2014 | 12,188 |
| 2015 | 12,054 |
| 2016 | 12,008 |
| 2017 | 11,950 |
| 2018 | 11,885 |
| 2019 | 11,831 |
| 2020 | 11,787 |
| 2021 | 11,744 |
| 2022 | 11,800 |
| 2023 | 11,768 |
| 2024 | 11,670 |
Race & Ethnicity
| White | 93.3% |
| Black or African American | 1.2% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.9% |
| Two or More Races | 0.0% |
Age & Sex
43.7
Median Age
49.1%
Female
50.9%
Male
23.4%
Age 65+
Age Distribution
Children (under 15): 17.2% · Seniors (65+): 23.4%
Income & Poverty
| Median household income | $63,438$-9,201 vs state |
| Mean household income | $85,216 |
| Per-capita income | $35,423 |
| Poverty rate | 6.2%-1.5% vs state |
| Unemployment rate | 1.8% |
| Employment-to-population | 58.9% |
Top Industries by Employment
The largest employment sector in Marion County is professional & business services, accounting for 30.7% of workers.
How residents commute
0.2%
Drive alone
5.5%
Carpool
75.3%
Public transit
9.5%
Work from home
23.2 min
Avg commute
Housing
$114,400$-89,000 vs state
Median home value
$727
Median rent
80.8%
Homeownership rate
5,673
Total housing units
82.7%
Occupied
17.3%
Vacant
19.2%
Renter-occupied
Social & access
92.8%
With health insurance
89.8%
With broadband internet
21.9%
Foreign-born
6.6%
Veterans (18+)
14.2%
With a disability
97.6%
Speak language other than English at home
Education
92.3%
High School+
28.8%
Bachelor's+
Largest cities in Kansas
Other counties in Kansas
Part of Kansas
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County rankings
Frequently Asked Questions
Marion County, Kansas has a population of 11,795 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 37th-largest county in Kansas. Population density is 12 people per square mile.
The population of Marion County has declined 7.9% since 2010 (12,671 → 11,670), a -0.59% annualized rate.
The median household income in Marion County, Kansas is $63,438, with mean (average) household income of $85,216 and per-capita income of $35,423. 6.2% of residents live below the federal poverty level.
In Marion County, the largest racial and ethnic groups are White (93.3%), Hispanic or Latino (1.9%), Black or African American (1.2%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Marion County, Kansas is 43.7 years. Residents are 49.1% female and 50.9% male.
The median home value in Marion County is $114,400 and median monthly rent is $727. 80.8% of occupied housing units are owner-occupied. The county has 5,673 total housing units, 17.3% of which are vacant.
The largest employment sector in Marion County, Kansas is professional, scientific, and management services, employing 30.7% of workers. The unemployment rate is 1.8%.
Wichita is among the largest cities associated with Marion County, Kansas, with a population of 396,488.
Marion County, KS Climate
Marion County, KS has an average annual temperature of 12.9°C (55°F) and receives about 829 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
12.9°C
Avg Temp
829
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -2° / 29° | 19 mm |
| February | 1° / 35° | 26 mm |
| March | 7° / 44° | 61 mm |
| April | 13° / 55° | 73 mm |
| May | 18° / 64° | 115 mm |
| June | 24° / 74° | 126 mm |
| July | 27° / 80° | 88 mm |
| August | 26° / 78° | 83 mm |
| September | 21° / 70° | 91 mm |
| October | 14° / 58° | 70 mm |
| November | 6° / 44° | 47 mm |
| December | 1° / 33° | 30 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, KS
The most comfortable months to visit Marion County, KS are typically September, May and June, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 33°C high). The coldest is January (near -8°C low). June is usually the wettest month.
Where to stay near Marion County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.