USStateMap

Ohio County Map

Ohio has 88 counties. Franklin County, whose seat is Columbus, the state capital, is the most populous with 1,323,807 residents in 2020, and Ashtabula County is the largest by land area at 702.1 sq mi.

County map of Ohio showing all 88 counties

Counties are switched on when the interactive map loads. Hover over a county to see its name, or untick Show counties to hide the county lines.

88counties
Franklinmost populous: 1,323,807
Ashtabulalargest: 702.1 sq mi
Lakesmallest: 229.3 sq mi

List of Ohio counties

All 88 counties in alphabetical order. Click a column heading to sort by seat, population or land area.

CountyCounty seatPopulation (2020)Land area (sq mi)
Adams CountyWest Union27,477583.9
Allen CountyLima102,206402.5
Ashland CountyAshland52,447423.0
Ashtabula CountyJefferson97,574702.1
Athens CountyAthens62,431503.6
Auglaize CountyWapakoneta46,422401.4
Belmont CountySt. Clairsville66,497532.1
Brown CountyGeorgetown43,676489.5
Butler CountyHamilton390,357466.5
Carroll CountyCarrollton26,721394.6
Champaign CountyUrbana38,714429.0
Clark CountySpringfield136,001396.9
Clermont CountyBatavia208,601452.6
Clinton CountyWilmington42,018408.7
Columbiana CountyLisbon101,877531.9
Coshocton CountyCoshocton36,612564.0
Crawford CountyBucyrus42,025401.8
Cuyahoga CountyCleveland1,264,817457.2
Darke CountyGreenville51,881598.1
Defiance CountyDefiance38,286411.4
Delaware CountyDelaware214,124443.1
Erie CountySandusky75,622251.3
Fairfield CountyLancaster158,921504.4
Fayette CountyWashington Court House28,951406.4
Franklin CountyColumbus1,323,807532.4
Fulton CountyWauseon42,713405.4
Gallia CountyGallipolis29,220466.5
Geauga CountyChardon95,397400.3
Greene CountyXenia167,966413.6
Guernsey CountyCambridge38,438522.3
Hamilton CountyCincinnati830,639405.4
Hancock CountyFindlay74,920531.3
Hardin CountyKenton30,696470.3
Harrison CountyCadiz14,483402.3
Henry CountyNapoleon27,662416.0
Highland CountyHillsboro43,317553.1
Hocking CountyLogan28,050421.3
Holmes CountyMillersburg44,223422.6
Huron CountyNorwalk58,565492.2
Jackson CountyJackson32,653420.3
Jefferson CountySteubenville65,249408.1
Knox CountyMount Vernon62,721525.5
Lake CountyPainesville232,603229.3
Lawrence CountyIronton58,240453.4
Licking CountyNewark178,519682.4
Logan CountyBellefontaine46,150458.5
Lorain CountyElyria312,964490.5
Lucas CountyToledo431,279339.7
Madison CountyLondon43,824465.8
Mahoning CountyYoungstown228,614411.5
Marion CountyMarion65,359403.8
Medina CountyMedina182,470421.5
Meigs CountyPomeroy22,210430.1
Mercer CountyCelina42,528462.4
Miami CountyTroy108,774406.5
Monroe CountyWoodsfield13,385455.7
Montgomery CountyDayton537,309461.4
Morgan CountyMcConnelsville13,802416.4
Morrow CountyMount Gilead34,950406.1
Muskingum CountyZanesville86,410664.5
Noble CountyCaldwell14,115398.0
Ottawa CountyPort Clinton40,364254.7
Paulding CountyPaulding18,806416.4
Perry CountyNew Lexington35,408407.9
Pickaway CountyCircleville58,539501.2
Pike CountyWaverly27,088440.3
Portage CountyRavenna161,791487.4
Preble CountyEaton40,999424.2
Putnam CountyOttawa34,451482.5
Richland CountyMansfield124,936495.2
Ross CountyChillicothe77,093689.2
Sandusky CountyFremont58,896408.2
Scioto CountyPortsmouth74,008610.1
Seneca CountyTiffin55,069551.0
Shelby CountySidney48,230407.7
Stark CountyCanton374,853575.3
Summit CountyAkron540,428412.8
Trumbull CountyWarren201,977618.1
Tuscarawas CountyNew Philadelphia93,263567.4
Union CountyMarysville62,784431.8
Van Wert CountyVan Wert28,931409.1
Vinton CountyMcArthur12,800412.4
Warren CountyLebanon242,337401.4
Washington CountyMarietta59,771632.0
Wayne CountyWooster116,894554.8
Williams CountyBryan37,102420.7
Wood CountyBowling Green132,248617.2
Wyandot CountyUpper Sandusky21,900406.9

Most populous counties

The five largest counties by 2020 population hold 38.1% of Ohio’s 11,799,448 residents:

  1. Franklin County (seat: Columbus): 1,323,807 people, 11.2% of the state
  2. Cuyahoga County (seat: Cleveland): 1,264,817 people, 10.7% of the state
  3. Hamilton County (seat: Cincinnati): 830,639 people, 7.0% of the state
  4. Summit County (seat: Akron): 540,428 people, 4.6% of the state
  5. Montgomery County (seat: Dayton): 537,309 people, 4.6% of the state

The least populous county is Vinton County, with 12,800 people.

Largest and smallest counties

By land area, the largest counties are Ashtabula County (702.1 sq mi), Ross County (689.2 sq mi) and Licking County (682.4 sq mi). The smallest are Lake County (229.3 sq mi), Erie County (251.3 sq mi) and Ottawa County (254.7 sq mi). Areas exclude water.

How counties work in Ohio

All 88 counties have a county government and a county seat. Most are run by a three-member board of county commissioners; Summit County and Cuyahoga County have charter governments with an elected county executive.

Columbus is the seat of Franklin County, but parts of the city extend into Delaware and Fairfield counties. Counties on Lake Erie include large areas of water: Lake County, the smallest by land area (229.3 sq mi), covers 979.2 sq mi in total, and Ashtabula County covers 1,367.9 sq mi.

Printable Ohio county maps

Download the labeled county map for reference or the blank version for coloring and geography practice; both are SVG files that print sharply at any size.

Labeled county map of Ohio
Labeled SVGBlank SVGState outline PNG

Frequently asked questions

How many counties are in Ohio?

88. The least populous is Vinton County, with 12,800 people in 2020.

What is the largest county in Ohio?

By land area, Ashtabula County in the northeast corner (702.1 sq mi), followed by Ross County (689.2 sq mi).

What is the most populous county in Ohio?

Franklin County, with 1,323,807 people in 2020, followed by Cuyahoga County (Cleveland) with 1,264,817.

What county is Columbus in?

Columbus is the seat of Franklin County; small parts of the city lie in Delaware and Fairfield counties.

More maps

Back to the Ohio state map. County maps of neighboring states: Indiana county map · Kentucky county map · Michigan county map · Pennsylvania county map · West Virginia county map.

Browse all 50 state maps.

Sources: U.S. Census Bureau (2020 Census, 2020 Gazetteer, boundaries); county seats: Wikipedia and Wikidata county lists. Last reviewed October 2026.