Ohio County Map - List of Counties in Ohio with Seats

Written and fact-checked by . Reviewed by . Last updated on May 07, 2026.

The U.S. state of Ohio is divided into 88 counties. Explore the Ohio County Map, list of Counties in Ohio along with their County Seats in alphabetical order and check their population, areas and the date of formation.

Ohio County Map

About Counties of Ohio

U.S State of Ohio is located in the Midwestern part of United States of America. The capital city of the state is Columbus. Columbus is the largest city in the state of Ohio. The state is the thirty fourth largest state by area. The state shares the borders with Lake Erie which is located to the north, Pennsylvania in the east, West Virginia to the southeast, Indiana to the west. The state is also known as “Buckeye State”. State has the total are of 40,860.69 square miles.

Counties in Ohio are 88 in number. The largest County by area in the state is Ashtabula County which is in 702.44 square miles. The smallest county is Lake County. Among the Counties in Ohio Franklin County has the highest population with 1,323,807 citizens. The other counties that have huge population are Hamilton County and Summit County. Of all Counties in Ohio Delaware is the richest county that earns $42,069 Per Capita Income. Adam County is the poorest county in the state. Adam County`s Per Capita Income is $39,079.

U.S state of Ohio has three branches of government namely Legislative branch, Executive branch and Judicial branch like all other states of the country. The local government of Ohio consists of 88 counties, Municipalities which include cities and villages. There are 251 cities towns and 681 villages and 904 special districts. According to the Constitution of Ohio and the rules and regulation of government Municipalities have in fact complete authority of home rule powers. Municipalities perhaps adopt various things like a charter, ordinances and resolutions for self- government. Each and every municipality can chose its own form of government. A lot of services are provided by city government for the citizens of Ohio. Most of Counties in Ohio are governed by Commissioners a sheriff, a coroner, an auditor, a treasurer, prosecutor, engineer a recorder and clerk of the court of the court of common.

The U.S. state of Ohio has 88 counties. Ohio is the 34th-largest state by area and with a population of nearly 11.7 million, is the seventh-most populous State. Ohio is located in the Midwestern region of the United States.

List of Ohio Counties and County Seat

S.NCountyCounty SeatPopulation(2020 Census)Area Formed
1Adams CountyWest Union27,477583.91 sq miJuly 10, 1797
2Allen CountyLima102,206404.43 sq miMarch 1, 1820
3Ashland CountyAshland52,447424.37 sq miFebruary 24, 1846
4Ashtabula CountyJefferson97,574702.44 sq miJune 7, 1807
5Athens CountyAthens62,431506.76 sq miMarch 1, 1805
6Auglaize CountyWapakoneta46,422401.25 sq miFebruary 14, 1848
7Belmont CountySt. Clairsville66,497537.35 sq miSeptember 7, 1801
8Brown CountyGeorgetown43,676491.76 sq miMarch 1, 1818
9Butler CountyHamilton390,357467.27 sq miMay 1, 1803
10Carroll CountyCarrollton26,721394.67 sq miJanuary 1, 1833
11Champaign CountyUrbana38,714428.56 sq miMarch 1, 1805
12Clark CountySpringfield136,001399.86 sq miMarch 1, 1818
13Clermont CountyBatavia208,601451.99 sq miDecember 6, 1800
14Clinton CountyWilmington42,018410.88 sq miMarch 1, 1810
15Columbiana CountyLisbon101,877532.46 sq miMay 1, 1803
16Coshocton CountyCoshocton36,612564.07 sq miJanuary 31, 1810
17Crawford CountyBucyrus42,025402.11 sq miApril 1, 1820
18Cuyahoga CountyCleveland1,264,817458.49 sq miJune 7, 1807
19Darke CountyGreenville51,881599.80 sq miJanuary 3, 1809
20Defiance CountyDefiance38,286411.16 sq miApril 7, 1845
21Delaware CountyDelaware214,124442.41 sq miApril 1, 1808
22Erie CountySandusky75,622254.88 sq miMarch 15, 1838
23Fairfield CountyLancaster158,921505.11 sq miDecember 9, 1800
24Fayette CountyWashington Court House28,951406.58 sq miMarch 1, 1810
25Franklin CountyColumbus1,323,807539.87 sq miApril 30, 1803
26Fulton CountyWauseon42,713406.78 sq miApril 1, 1850
27Gallia CountyGallipolis29,220468.78 sq miApril 30, 1803
28Geauga CountyChardon95,397403.66 sq miMarch 1, 1806
29Greene CountyXenia167,966414.88 sq miMay 1, 1803
30Guernsey CountyCambridge38,438521.90 sq miMarch 1, 1810
31Hamilton CountyCincinnati830,639413.44 sq miJanuary 2, 1790
32Hancock CountyFindlay74,731531.35 sq miApril 1, 1820
33Hardin CountyKenton30,696470.44 sq miApril 1, 1820
34Harrison CountyCadiz14,483402.24 sq miFebruary 1, 1813
35Henry CountyNapoleon27,825420.44 sq miApril 1, 1820
36Highland CountyHillsboro43,476553.59 sq miMay 1, 1805
37Hocking CountyLogan28,050421.76 sq miMarch 1, 1818
38Holmes CountyMillersburg44,124423.09 sq miJanuary 20, 1824
39Huron CountyNorwalk58,565495.14 sq miMay 1, 1809
40Jackson CountyJackson32,653420.96 sq miMarch 1, 1816
41Jefferson CountySteubenville65,249410.67 sq miJuly 29, 1797
42Knox CountyMount Vernon62,721530.10 sq miMarch 1, 1808
43Lake CountyPainesville232,603227.49 sq miMarch 6, 1840
44Lawrence CountyIronton58,240453.37 sq miDecember 21, 1815
45Licking CountyNewark178,519682.50 sq miMarch 1, 1808
46Logan CountyBellefontaine46,150467.76 sq miMarch 1, 1818
47Lorain CountyElyria312,964491.10 sq miDecember 26, 1822
48Lucas CountyToledo431,279340.48 sq miJune 20, 1835
49Madison CountyLondon44,731465.44 sq miMarch 1, 1810
50Mahoning CountyYoungstown228,614412.43 sq miMarch 1, 1846
51Marion CountyMarion65,359403.94 sq miFebruary 20, 1820
52Medina CountyMedina182,470421.36 sq miFebruary 18, 1812
53Meigs CountyPomeroy22,210429.14 sq miApril 1, 1819
54Mercer CountyCelina42,528462.44 sq miApril 1, 1820
55Miami CountyTroy108,774406.08 sq miFebruary 1, 1807
56Monroe CountyWoodsfield13,025455.49 sq miJanuary 29, 1813
57Montgomery CountyDayton537,309461.27 sq miMay 1, 1803
58Morgan CountyMcConnelsville14,115421.33 sq miDecember 29, 1817
59Morrow CountyMount Gilead35,696406.08 sq miFebruary 24, 1848
60Muskingum CountyZanesville86,410664.58 sq miMarch 1, 1804
61Noble CountyCaldwell14,115398.14 sq miMarch 11, 1851
62Ottawa CountyPort Clinton40,364255.17 sq miMarch 6, 1840
63Paulding CountyPaulding18,806416.09 sq miMarch 1, 1820
64Perry CountyNew Lexington35,408408.37 sq miMarch 1, 1818
65Pickaway CountyCircleville58,457501.32 sq miMarch 1, 1810
66Pike CountyWaverly27,695440.42 sq miFebruary 1, 1815
67Portage CountyRavenna161,791487.39 sq miJune 9, 1808
68Preble CountyEaton40,999424.80 sq miMarch 1, 1808
69Putnam CountyOttawa34,451483.93 sq miApril 1, 1834
70Richland CountyMansfield124,936495.18 sq miMarch 1, 1808
71Ross CountyChillicothe77,093689.21 sq miAugust 20, 1798
72Sandusky CountyFremont58,896408.35 sq miMarch 1, 1820
73Scioto CountyPortsmouth74,008612.27 sq miMarch 1, 1803
74Seneca CountyTiffin55,069551.00 sq miApril 1, 1820
75Shelby CountySidney48,627408.93 sq miApril 1, 1819
76Stark CountyCanton374,853575.36 sq miFebruary 13, 1808
77Summit CountyAkron540,428412.97 sq miMarch 3, 1840
78Trumbull CountyWarren201,977618.27 sq miJuly 10, 1800
79Tuscarawas CountyNew Philadelphia93,263568.42 sq miMarch 15, 1808
80Union CountyMarysville62,450437.04 sq miApril 1, 1820
81Van Wert CountyVan Wert28,931409.08 sq miFebruary 24, 1837
82Vinton CountyMcArthur12,565414.08 sq miMarch 23, 1850
83Warren CountyLebanon242,337401.31 sq miMay 1, 1803
84Washington CountyMarietta59,911632.90 sq miJuly 26, 1788
85Wayne CountyWooster116,894555.77 sq miMarch 1, 1808
86Williams CountyBryan36,714423.56 sq miApril 1, 1820
87Wood CountyBowling Green132,248617.80 sq miApril 1, 1820
88Wyandot CountyUpper Sandusky21,900406.06 sq miFebruary 3, 1845

Ohio County Facts

ContinentNorth America
CountryUnited States
StateOhio
Total Counties88
GovernmentCounty government
Largest CityColumbus
SubdivisionsCities, towns, unincorporated communities, census-designated places
Total Area44,825 sq mi (116,096 sq km)
Largest County (Area)Ashtabula County (1,368 sq mi)
Smallest County (Area)Lake County (228 sq mi)
Most Populous CountyFranklin County (Population: 1,323,807 as per 2020 Census)
Least Populous CountyVinton County (Population: 12,565 as per 2020 Census)
Population11,799,448 (2020 Census)
Highest PointCampbell Hill - 1,549 ft (472 m)
Lowest PointOhio River - 455 ft (139 m)
Time ZoneEastern Time Zone (UTC -5 / UTC -4 DST)
Postal AbbreviationOH
FIPS Code39
Famous ForMidwestern culture, manufacturing, sports, and historic towns
Major CountiesFranklin, Cuyahoga, Hamilton, Summit, Montgomery
Official Websiteohio.gov

Top 20 Largest Cities in Ohio by Population (2020 Census)

CityCountyPopulation (2020)Area
ColumbusFranklin905,748223.1 sq mi (578 sq km)
ClevelandCuyahoga372,62482.5 sq mi (214 sq km)
CincinnatiHamilton309,31779.6 sq mi (206 sq km)
ToledoLucas270,87184.0 sq mi (218 sq km)
AkronSummit190,46962.4 sq mi (162 sq km)
DaytonMontgomery137,64456.5 sq mi (146 sq km)
ParmaCuyahoga81,14620.8 sq mi (54 sq km)
CantonStark70,87225.5 sq mi (66 sq km)
YoungstownMahoning60,06834.6 sq mi (90 sq km)
LorainLorain65,21124.1 sq mi (62 sq km)
HamiltonButler62,47722.8 sq mi (59 sq km)
SpringfieldClark58,66225.5 sq mi (66 sq km)
KetteringMontgomery57,86218.7 sq mi (48 sq km)
ElyriaLorain52,65620.8 sq mi (54 sq km)
LakewoodCuyahoga50,9426.7 sq mi (17 sq km)
Cuyahoga FallsSummit51,11425.8 sq mi (67 sq km)
MiddletownButler/Warren50,98726.3 sq mi (68 sq km)
NewarkLicking49,93421.5 sq mi (56 sq km)
MansfieldRichland47,53430.6 sq mi (79 sq km)
MentorLake47,45028.0 sq mi (73 sq km)

Main Sights in Ohio

Cuyahoga Valley National Park, Rock and Roll Hall of Fame, Cedar Point, Hocking Hills State Park, Pro Football Hall of Fame, National Museum of the United States Air Force, Ohio Statehouse, Cincinnati Zoo & Botanical Garden, Lake Erie Islands, Franklin Park Conservatory, Toledo Museum of Art, Amish Country, Cleveland Museum of Art, Kings Island, Perry's Victory and International Peace Memorial.

National Parks and Historic Sites in Ohio

Cuyahoga Valley National Park, Charles Young Buffalo Soldiers National Monument, Perry's Victory and International Peace Memorial, James A. Garfield National Historic Site, William Howard Taft National Historic Site, Dayton Aviation Heritage National Historical Park, First Ladies National Historic Site.

Major Rivers in Ohio

Ohio River, Scioto River, Muskingum River, Great Miami River, Little Miami River, Maumee River, Cuyahoga River, Sandusky River, Hocking River, Auglaize River, Mad River, Tuscarawas River.

Lakes of Ohio

Lake Erie, Grand Lake St. Marys, Indian Lake, Salt Fork Lake, Alum Creek Lake, Caesar Creek Lake, Buckeye Lake, Mosquito Lake, Pymatuning Reservoir, Senecaville Lake, Berlin Lake, Piedmont Lake.

Golf Courses in Ohio (with Location)

Muirfield Village Golf Club - Dublin, Firestone Country Club - Akron, Inverness Club - Toledo, The Golf Club - New Albany, Double Eagle Club - Galena, Camargo Club - Cincinnati, Scioto Country Club - Columbus, Canterbury Golf Club - Beachwood, Brookside Country Club - Canton, Belmont Country Club - Perrysburg, Medina Country Club - Medina, Lakewood Country Club - Westlake, Toledo Country Club - Toledo, Shaker Heights Country Club - Shaker Heights, Oakwood Club - Dayton.