Ohio Counties

Complete list of all 88 counties in Ohio with population, area, median income, and county seats — plus a free printable blank map.

Counties

Population

11,810,293

Area

40,861 sq mi

Capital

Columbus

Time Zone

Eastern (ET)

Labeled outline map of Ohio counties. Download a printable version in SVG, PNG, or PDF.

All 88 Ohio counties

County	County Seat	Population ▼	Area	Median Income	Cities
Franklin	—	1,324,154	532 mi²	$79,373	14
Cuyahoga	—	1,251,589	457 mi²	$70,950	21
Hamilton	—	842,501	406 mi²	$76,743	10
Summit	—	541,944	413 mi²	$79,648	18
Montgomery	—	507,675	462 mi²	$70,797	10
Lucas	—	424,349	341 mi²	$67,502	12
Butler	—	389,474	467 mi²	$82,460	14
Stark	—	359,009	575 mi²	$68,346	20
Lorain	—	307,803	491 mi²	$79,760	13
Lake	—	231,954	227 mi²	$81,295	9
Warren	—	230,451	401 mi²	$111,189	12
Delaware	—	227,622	443 mi²	$134,622	10
Mahoning	—	224,739	412 mi²	$59,052	18
Clermont	—	221,512	452 mi²	$90,139	16
Greene	—	204,272	414 mi²	$85,446	11

How many counties does Ohio have?

Ohio has 88 counties covering 40,861 square miles and roughly 11,810,293 residents. The state was admitted to the Union in 1803 as the 17th state, and the current county boundaries reflect more than a century of administrative subdivision.

The largest county by land area is Ashtabula County at 702 square miles, home to about 97,097 residents. The most populous is Franklin County with approximately 1,324,154 residents — a density of about 2,489 people per square mile.

At the other end of the scale, Monroe County has only about 11,656 residents.

Columbus is both the state capital and the largest city in Ohio.

Related resources

Download a printable outline of Ohio’s county boundaries from our blank map of Ohio page — available in SVG, PNG, and PDF.

Use the What County Am I In? tool to detect which Ohio county a GPS location or address falls in, or the Address to County Lookup for batch input.

For demographic radius analysis, the Find ZIP Codes in Radius and Population Within Radius tools let you draw a circle around any Ohio address and see every ZIP code and the total population inside.

Two SimpleMapLab studies cover Ohio specifically: the 100-mile radius around Columbus measures how much of the state lives within 100 miles of its capitol, and the loneliest town in Ohio ranks the state’s most isolated inhabited place. The county-counts blog post puts Ohio’s 88 counties in national context.

Frequently asked questions

Ohio has 88 counties. The state was admitted to the Union in 1803 as the 17th state. County boundaries have shifted over time as the population spread and new administrative units were carved from existing ones.

Ashtabula County is the largest by land area at 702 square miles, with about 97,097 residents.

Franklin County is the most populous, with approximately 1,324,154 residents over 532 square miles.

Monroe County has the smallest population at about 11,656 residents.

Columbus is both the state capital and the largest city in Ohio.

Population, area, and demographic figures are aggregated from ZIP-code-level US Census data (via the SimpleMaps dataset) and the US Census Gazetteer. County boundaries used to render the map are from the US Atlas TopoJSON build of the Census Bureau's TIGER/Line shapefiles. The data is public domain.

Data sources

Population and demographics are aggregated from ZIP-code-level US Census data via the SimpleMaps dataset. Countiesboundaries are from the US Atlas TopoJSON build of the Census Bureau’s TIGER/Line shapefiles. Land area is from the Census Gazetteer. State counts follow the US Census Bureau’s definition of counties and county-equivalents (50 states + DC = 3,143). All sources are public domain.

Neighboring states