Clark County, Ohio

County seat: Springfield · Population 135,340 (2025) · 396 sq mi

Clark County is the 21st most populous of Ohio's 88 counties, with 135,340 people (2025 estimate). Its county seat is Springfield. The map shows its 10 cities and towns and the 5 neighboring counties.

Map of Clark County, Ohio with cities, towns and the county boundary
Clark County, Ohio with its cities and towns, unincorporated communities (CDPs) and neighboring counties. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
Download PDF (Letter) 107 KBPNG image 78 KBOhio county map

Clark County facts

County seat
Springfield
Population (2025 estimate)
135,340 −0.5% since 2020
Land area
396 sq mi 83rd largest of 88
Water area
6 sq mi
Population density
342 per sq mi
Established
1818
Named after
George Rogers Clark American surveyor, soldier, and militia officer (1752–1818)
Largest city
Springfield 58,281
Median household income
$63,132
Cities and towns
10 plus 7 CDPs
ZIP codes
23
Time zone
Eastern
FIPS code
39023

Cities and towns in Clark County

Clark County has 10 incorporated cities, towns and villages. Populations count the people living inside Clark County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Springfield (county seat)City58,281
New CarlisleCity5,525
EnonVillage2,456
South CharlestonVillage1,698
North HamptonVillage461
South ViennaVillage405
Tremont CityVillage346
DonnelsvilleVillage257
CatawbaVillage244
CliftonVillage47Greene County

Unincorporated communities (CDPs)

Census-designated places are communities without their own city government; the county provides their services.

CommunityPopulationAlso in
Northridge7,817
Park Layne4,301
Green Meadows2,144
Holiday Valley1,660
Crystal Lakes1,245
Medway580
Lawrenceville302

ZIP codes in Clark County

23 ZIP codes reach into Clark County. ZIP codes ignore county lines, so some also cover a neighboring county.

Population of Clark County, 2020–2025

Clark County shrank by 635 people (−0.5%) between April 2020 and July 2025: 2,104 more deaths than births and a net gain of 1,449 people from migration.

Year (July 1)Population
2020135,888
2021135,400
2022134,691
2023135,342
2024136,170
2025135,340

Neighboring counties

Printable Clark County map

The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.

Paste this code to embed the map on your site:

Sources

Back to the Ohio county map with all 88 counties. Found an error? Tell us.