Clark County, Ohio Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 21st-largest in Ohio
The population of Clark County, Ohio is 135,445 as of the 2023 American Community Survey, making it the 21st-largest county in Ohio. The median household income is $60,846, the median home value is $155,900, and the median age is 41.2.
The population of Clark County has declined 2.4% since 2010 (138,272 → 134,985), a -0.17% annualized rate.
135,445
Population
-0.17%
Annual growth
342
People / sq mi
$60,846
Median Income
$155,900
Median Home Value
Clark County covers 396 sq mi of land at 342.1 people per square mile.
About Clark County, OH
What distinguishes Clark County is density: among the most densely settled of US counties, around 342 people per square mile. Clark County is a county in Ohio with a population of 135,445. It ranks #21 among counties in Ohio by population.
Household earnings are middling, with a median of $60,846 — below the US median of $78,538. The poverty rate is 11.3%, below the national 12.4%. The typical home is valued at $155,900, with typical rent around $840.
Roughly 18.5% of adults have a bachelor’s, below the national 35.0%. Around 8.3% of workers work from home, below the national 14.0%, and the average commute runs about 23 minutes each way.
That density explains much of the rest of the profile in Clark County: denser places lean toward renting, shorter commutes by transit, and a younger working-age mix.
Clark County Population History (2010-2024)
The county of Clark County had a population of 138,272 in 2010 and 134,985 in 2024, a -2.4% growth over 14 years. The peak was 138,272 in 2010. Average annual growth rate: -0.17%.
134,985
Population (2024)
138,272
Population (2010)
138,272
Peak (2010)
-0.17%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 138,272 |
| 2011 | 137,823 |
| 2012 | 137,198 |
| 2013 | 136,682 |
| 2014 | 136,364 |
| 2015 | 135,810 |
| 2016 | 134,805 |
| 2017 | 134,636 |
| 2018 | 134,697 |
| 2019 | 134,315 |
| 2020 | 135,894 |
| 2021 | 135,490 |
| 2022 | 134,686 |
| 2023 | 134,735 |
| 2024 | 134,985 |
Race & Ethnicity
| White | 83.5% |
| Black or African American | 8.2% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.1% |
| Two or More Races | 0.0% |
Age & Sex
41.2
Median Age
50.9%
Female
49.1%
Male
20.0%
Age 65+
Age Distribution
Children (under 15): 18.5% · Seniors (65+): 20.0%
Income & Poverty
| Median household income | $60,846$-8,834 vs state |
| Mean household income | $77,705 |
| Per-capita income | $32,421 |
| Poverty rate | 11.3%+2.1% vs state |
| Unemployment rate | 3.8% |
| Employment-to-population | 55.2% |
Top Industries by Employment
The largest employment sector in Clark County is professional & business services, accounting for 22.9% of workers.
How residents commute
0.4%
Drive alone
2.0%
Carpool
79.6%
Public transit
8.3%
Work from home
22.9 min
Avg commute
Housing
$155,900$-43,300 vs state
Median home value
$840
Median rent
69.2%
Homeownership rate
61,092
Total housing units
90.6%
Occupied
9.4%
Vacant
30.8%
Renter-occupied
Social & access
93.2%
With health insurance
93.7%
With broadband internet
18.7%
Foreign-born
9.3%
Veterans (18+)
16.9%
With a disability
96.5%
Speak language other than English at home
Education
89.3%
High School+
18.5%
Bachelor's+
Largest cities in Ohio
Other counties in Ohio
Part of Ohio
Metro areas in Ohio
County rankings
Frequently Asked Questions
Clark County, Ohio has a population of 135,445 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 21st-largest county in Ohio. Population density is 342 people per square mile.
The population of Clark County has declined 2.4% since 2010 (138,272 → 134,985), a -0.17% annualized rate.
The median household income in Clark County, Ohio is $60,846, with mean (average) household income of $77,705 and per-capita income of $32,421. 11.3% of residents live below the federal poverty level.
In Clark County, the largest racial and ethnic groups are White (83.5%), Black or African American (8.2%), Hispanic or Latino (1.1%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Clark County, Ohio is 41.2 years. Residents are 50.9% female and 49.1% male.
The median home value in Clark County is $155,900 and median monthly rent is $840. 69.2% of occupied housing units are owner-occupied. The county has 61,092 total housing units, 9.4% of which are vacant.
The largest employment sector in Clark County, Ohio is professional, scientific, and management services, employing 22.9% of workers. The unemployment rate is 3.8%.
Columbus is among the largest cities associated with Clark County, Ohio, with a population of 906,480.
Clark County, OH Climate
Clark County, OH has an average annual temperature of 10.8°C (51°F) and receives about 994 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
10.8°C
Avg Temp
994
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -3° / 26° | 56 mm |
| February | -1° / 30° | 53 mm |
| March | 4° / 40° | 80 mm |
| April | 10° / 50° | 93 mm |
| May | 16° / 61° | 109 mm |
| June | 21° / 70° | 101 mm |
| July | 23° / 74° | 111 mm |
| August | 22° / 72° | 92 mm |
| September | 19° / 65° | 77 mm |
| October | 12° / 54° | 68 mm |
| November | 6° / 43° | 81 mm |
| December | 0° / 32° | 73 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 Clark County, OH
The most comfortable months to visit Clark County, OH are typically June, August and September, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 29°C high). The coldest is January (near -8°C low). July is usually the wettest month.
Where to stay near Clark County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.