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
Educational attainment is the headline number in Marion County: 13.7% of adults 25 and older have a four-year degree. Marion County is a county in Ohio with a population of 65,145. It ranks #38 among counties in Ohio by population.
Household earnings are middling, with a median of $57,306 — below the US median of $78,538. Poverty runs at 10.3%, below the national 12.4%. Median home value is $146,200, with typical rent around $850.
Four-year-degree attainment is near the bottom of the range for US counties, 13.7%, below the national 35.0%. Remote work is below the national 14.0% at 5.9%, and the average commute runs about 24 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.