Marion County, Ohio Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 38th-largest in Ohio
The population of Marion County, Ohio is 65,145 as of the 2023 American Community Survey, making it the 38th-largest county in Ohio. The median household income is $57,306, the median home value is $146,200, and the median age is 40.5.
The population of Marion County has declined 2.2% since 2010 (66,459 → 64,976), a -0.16% annualized rate.
65,145
Population
-0.16%
Annual growth
161
People / sq mi
$57,306
Median Income
$146,200
Median Home Value
Marion County covers 404 sq mi of land at 161.3 people per square mile.
About Marion County, OH
Marion County is a county in Ohio with a population of 65,145. It ranks #38 among counties in Ohio by population. The median age is 40.5, older than the national median. The population is 53.7% male and 46.3% female.
The median household income in Marion County is $57,306, below the US median of $74,580. 10.3% of residents live below the federal poverty level. Home values sit at a median of $146,200, with monthly rent averaging $850. The homeownership rate of 67.8% is higher than the national rate of 64.8%.
Educational attainment in Marion County reflects 13.7% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 5.9% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 23.9 minutes each way.
Marion County Population History (2010-2024)
The county of Marion County had a population of 66,459 in 2010 and 64,976 in 2024, a -2.2% growth over 14 years. The peak was 66,614 in 2011. Average annual growth rate: -0.16%.
64,976
Population (2024)
66,459
Population (2010)
66,614
Peak (2011)
-0.16%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 66,459 |
| 2011 | 66,614 |
| 2012 | 66,301 |
| 2013 | 65,996 |
| 2014 | 65,822 |
| 2015 | 65,470 |
| 2016 | 65,481 |
| 2017 | 65,113 |
| 2018 | 65,426 |
| 2019 | 65,057 |
| 2020 | 65,390 |
| 2021 | 65,330 |
| 2022 | 64,576 |
| 2023 | 64,828 |
| 2024 | 64,976 |
Race & Ethnicity
| White | 87.6% |
| Black or African American | 5.2% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.2% |
| Two or More Races | 0.0% |
Age & Sex
40.5
Median Age
46.3%
Female
53.7%
Male
18.3%
Age 65+
Age Distribution
Children (under 15): 17.8% · Seniors (65+): 18.3%
Income & Poverty
| Median household income | $57,306$-12,374 vs state |
| Mean household income | $78,335 |
| Per-capita income | $30,491 |
| Poverty rate | 10.3%+1.1% vs state |
| Unemployment rate | 3.2% |
| Employment-to-population | 50.4% |
Top Industries by Employment
The largest employment sector in Marion County is professional & business services, accounting for 23.3% of workers.
How residents commute
0.6%
Drive alone
0.9%
Carpool
81.9%
Public transit
5.9%
Work from home
23.9 min
Avg commute
Housing
$146,200$-53,000 vs state
Median home value
$850
Median rent
67.8%
Homeownership rate
27,381
Total housing units
89.6%
Occupied
10.4%
Vacant
32.2%
Renter-occupied
Social & access
94.7%
With health insurance
92.8%
With broadband internet
15.1%
Foreign-born
8.4%
Veterans (18+)
17.5%
With a disability
96.4%
Speak language other than English at home
Education
89.1%
High School+
13.7%
Bachelor's+
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County rankings
Frequently Asked Questions
Marion County, Ohio has a population of 65,145 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 38th-largest county in Ohio. Population density is 161 people per square mile.
The population of Marion County has declined 2.2% since 2010 (66,459 → 64,976), a -0.16% annualized rate.
The median household income in Marion County, Ohio is $57,306, with mean (average) household income of $78,335 and per-capita income of $30,491. 10.3% of residents live below the federal poverty level.
In Marion County, the largest racial and ethnic groups are White (87.6%), Black or African American (5.2%), Hispanic or Latino (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, Ohio is 40.5 years. Residents are 46.3% female and 53.7% male.
The median home value in Marion County is $146,200 and median monthly rent is $850. 67.8% of occupied housing units are owner-occupied. The county has 27,381 total housing units, 10.4% of which are vacant.
The largest employment sector in Marion County, Ohio is professional, scientific, and management services, employing 23.3% of workers. The unemployment rate is 3.2%.
Columbus is among the largest cities associated with Marion County, Ohio, with a population of 906,480.
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Population, race, income, age, and trends across Ohio
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.