There are 88 counties in the U.S. state of Ohio. Nine of them existed at the time of the Ohio Constitutional Convention in 1802.^[1] A tenth county, Wayne, was established on August 15, 1796, and encompassed roughly the present state of Michigan.^[2] During the Convention, the county was opposed to statehood, and was not only left out of the Convention, but dissolved; the current Wayne County is in northeastern Ohio, considerably distant from the area that was the original Wayne County.^[1]

The Ohio Constitution allows counties to set up a charter government as many cities and villages do,^[3] but only Summit and Cuyahoga counties have done so,^[4] the latter having been approved by voters in November 2009.^[5] Counties do not possess home rule powers and can do only what has been expressly authorized by the Ohio General Assembly. The elected county officials in Ohio county governments include three commissioners, a sheriff (the highest law enforcement officer in the county); prosecutor (equivalent of a district attorney in other states); coroner, engineer, Recorder, auditor, treasurer, and clerk of courts.^[6][7]

Population figures are based on the 2023 vintage Census population estimates. The population of Ohio was 11,785,935 at that time, a decrease of 0.1% from 2020. The average population of Ohio's counties was 133,931; Franklin County was the most populous (1,326,063) and Vinton County was the least (12,474). The average land area is 464 sq mi (1,200 km²). The largest county by area is Ashtabula County at 702.44 sq mi (1,819.3 km²), and its neighbor, Lake County, is the smallest at 228.21 sq mi (591.1 km²). The total area of the state is 40,860.69 sq mi (105,828.7 km²).^[8][9]

List of counties

Zdroj:https://en.wikipedia.org?pojem=List_of_counties_in_Ohio
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County	FIPS code[10]	County Seat[11]	Est.[12]	Origin[13]	Etymology[12][13]	Population (2023)[10][11][14]	Area[11]	Map
Adams County	001	West Union	Jul 10, 1797	Hamilton County	John Adams (1735–1826), President of the United States when the county was organized	27,521	583.91 sq mi (1,512 km2)
Allen County	003	Lima	Mar 1, 1820	Shelby County	John Allen (1771/2-1813), a War of 1812 colonel[15]	100,838	404.43 sq mi (1,047 km2)
Ashland County	005	Ashland	Feb 24, 1846	Wayne, Richland, Huron, and Lorain Counties	Ashland, home of U.S. Senator from Kentucky Henry Clay	52,190	424.37 sq mi (1,099 km2)
Ashtabula County	007	Jefferson	Jun 7, 1807	Trumbull and Geauga Counties	Ashtabula River, which means "fish river" in an Algonquian language[16]	96,845	702.44 sq mi (1,819 km2)
Athens County	009	Athens	Mar 1, 1805	Washington County	Athens in Greece	62,706	506.76 sq mi (1,313 km2)
Auglaize County	011	Wapakoneta	Feb 14, 1848	Allen, Mercer, Darke, Hardin, Logan, Shelby, and Van Wert Counties	Auglaize River, which means "fallen timbers river" in the Shawnee Indian language	46,050	401.25 sq mi (1,039 km2)
Belmont County	013	St. Clairsville	Sep 7, 1801	Jefferson and Washington Counties	French for "beautiful mountain"	64,918	537.35 sq mi (1,392 km2)
Brown County	015	Georgetown	Mar 1, 1818	Adams and Clermont Counties	General Jacob Brown (1775–1828), an officer of the War of 1812	43,777	491.76 sq mi (1,274 km2)
Butler County	017	Hamilton	May 1, 1803	Hamilton County	General Richard Butler (1743–1791), killed at the Battle of the Wabash	393,043	467.27 sq mi (1,210 km2)
Carroll County	019	Carrollton	Jan 1, 1833	Columbiana, Stark, Harrison, Jefferson, and Tuscarawas Counties	Charles Carroll (1737–1832), last surviving signer of the United States Declaration of Independence	26,758	394.67 sq mi (1,022 km2)
Champaign County	021	Urbana	Mar 1, 1805	Greene and Franklin Counties	French for "a plain", describing the land in the area	38,845	428.56 sq mi (1,110 km2)
Clark County	023	Springfield	Mar 1, 1818	Champaign, Madison, and Greene Counties	General George Rogers Clark (1752–1818), defeated the Shawnee Indians in a battle near the Springfield area	134,610	399.86 sq mi (1,036 km2)
Clermont County	025	Batavia	Dec 6, 1800	Hamilton County	French for "clear mountain"	211,972	451.99 sq mi (1,171 km2)
Clinton County	027	Wilmington	Mar 1, 1810	Highland and Warren Counties	George Clinton (1739–1812), vice-president when the county was organized	41,938	410.88 sq mi (1,064 km2)
Columbiana County	029	Lisbon	May 1, 1803	Jefferson and Washington Counties	Christopher Columbus, European explorer of the Americas	100,182	532.46 sq mi (1,379 km2)
Coshocton County	031	Coshocton	Jan 31, 1810	Muskingum and Tuscarawas Counties	Delaware Indian word meaning "union of waters"	36,869	564.07 sq mi (1,461 km2)
Crawford County	033	Bucyrus	Apr 1, 1820	Delaware County	Colonel William Crawford (1732–1782), Revolutionary War officer	41,529	402.11 sq mi (1,041 km2)
Cuyahoga County	035	Cleveland	Jun 7, 1807	Geauga County	Cuyahoga River, which means "crooked river" in an Iroquoian language[17]	1,233,088	458.49 sq mi (1,187 km2)
Darke County	037	Greenville	Jan 3, 1809	Miami County	General William Darke (1736–1801), Revolutionary War officer	51,415	599.80 sq mi (1,553 km2)
Defiance County	039	Defiance	Apr 7, 1845	Williams, Henry, and Paulding Counties	Fort Defiance, built in 1794 by General Anthony Wayne	38,315	411.16 sq mi (1,065 km2)
Delaware County	041	Delaware	Apr 1, 1808	Franklin County	Delaware Indians	231,636	442.41 sq mi (1,146 km2)
Erie County	043	Sandusky	Mar 15, 1838	Huron and Sandusky Counties	Erie Indians	74,035	254.88 sq mi (660 km2)
Fairfield County	045	Lancaster	Dec 9, 1800	Ross and Washington Counties	Named for the beauty of its "fair fields"	165,360	505.11 sq mi (1,308 km2)
Fayette County	047	Washington Court House	Mar 1, 1810	Ross and Highland Counties	Gilbert du Motier, marquis de La Fayette, French military officer and aristocrat who participated in both the American and French revolutions	28,817	406.58 sq mi (1,053 km2)
Franklin County	049	Columbus	Apr 30, 1803	Ross and Wayne Counties	Benjamin Franklin (1706–1791), Founding Father, author, printer, political theorist, scientist, inventor, and statesman	1,326,063	539.87 sq mi (1,398 km2)
Fulton County	051	Wauseon	Apr 1, 1850	Lucas, Henry, and Williams Counties	Robert Fulton (1765–1815), inventor of the steamboat[18]	42,007	406.78 sq mi (1,054 km2)
Gallia County	053	Gallipolis	Apr 30, 1803	Washington and Adams Counties	Gaul, the ancient name of France	28,986	468.78 sq mi (1,214 km2)
Geauga County	055	Chardon	Mar 1, 1806	Trumbull County	An Indian word meaning "raccoon"	95,407	403.66 sq mi (1,045 km2)
Greene County	057	Xenia	May 1, 1803	Hamilton and Ross Counties	General Nathanael Greene (1742–1786), Revolutionary War officer	169,691	414.88 sq mi (1,075 km2)
Guernsey County	059	Cambridge	Mar 1, 1810	Belmont and Muskingum Counties	Island of Guernsey, from where most of the settlers originated	38,089	521.90 sq mi (1,352 km2)
Hamilton County	061	Cincinnati	Jan 2, 1790	One of the original counties	Alexander Hamilton (1755/7-1804), Secretary of the Treasury when the county was organized	827,058	407.36 sq mi (1,055 km2)
Hancock County	063	Findlay	Apr 1, 1820	Logan County	John Hancock (1737–1793), president of the Continental Congress	74,704	531.35 sq mi (1,376 km2)
Hardin County	065	Kenton	Apr 1, 1820	Logan County	General John Hardin (1753–1792), Revolutionary War officer	30,368	470.29 sq mi (1,218 km2)
Harrison County	067	Cadiz	Feb 1, 1813	Jefferson and Tuscarawas Counties	General William Henry Harrison (1773–1841), an officer of the War of 1812 and future President of the United States	14,159	403.53 sq mi (1,045 km2)
Henry County	069	Napoleon	Apr 1, 1820	Shelby County	Patrick Henry (1736–1799), Revolutionary War-era legislator, orator, and scholar	27,520	416.50 sq mi (1,079 km2)
Highland County	071	Hillsboro	May 1, 1805	Ross, Adams, and Clermont Counties	Descriptive of the county's terrain	43,614	553.28 sq mi (1,433 km2)
Hocking County	073	Logan	Mar 1, 1818	Athens, Ross, and Fairfield Counties	Possibly derived from the Delaware Indian word "Hoch-Hoch-ing", meaning "bottle"	27,540	422.75 sq mi (1,095 km2)
Holmes County	075	Millersburg	Jan 20, 1824	Coshocton, Wayne, and Tuscarawas Counties	Major Andrew Holmes (died 1814), a War of 1812 officer	44,386	422.99 sq mi (1,096 km2)
Huron County	077	Norwalk	Mar 7, 1809	Portage and Cuyahoga Counties	Huron Indians	58,199	492.69 sq mi (1,276 km2)
Jackson County	079	Jackson	Mar 1, 1816	Scioto, Gallia, Athens, and Ross Counties	General Andrew Jackson (1767–1845), future President of the United States	32,606	420.28 sq mi (1,089 km2)
Jefferson County	081	Steubenville	Jul 29, 1797	Washington County	Thomas Jefferson (1743–1826), Vice President when the county was organized, future President of the United States, and principal author of the Declaration of Independence	64,026	409.61 sq mi (1,061 km2)
Knox County	083	Mount Vernon	Mar 1, 1808	Fairfield County	General Henry Knox, the first Secretary of War	63,320	527.12 sq mi (1,365 km2)
Lake County	085	Painesville	Mar 6, 1840	Geauga and Cuyahoga Counties	Its location on Lake Erie	231,640	228.21 sq mi (591 km2)
Lawrence County	087	Ironton	Dec 21, 1815	Gallia and Scioto Counties	Captain James Lawrence (1781–1813), naval hero in the War of 1812	56,118	454.96 sq mi (1,178 km2)
Licking County	089	Newark	Mar 1, 1808	Fairfield County	Licking River, named for the salt licks in the area, or an English pronunciation of the Lenape word W'li/'ik'/nk meaning "where the flood waters recede"[19]	183,201	686.50 sq mi (1,778 km2)
Logan County	091	Bellefontaine	Mar 1, 1818	Champaign County	General Benjamin Logan (c. 1742 – 1802), who destroyed Shawnee Indian towns in the county	46,057	458.44 sq mi (1,187 km2)
Lorain County	093	Elyria	Dec 26, 1822	Huron, Cuyahoga, and Medina Counties	Province of Lorraine, France	317,910	492.50 sq mi (1,276 km2)
Lucas County	095	Toledo	Jun 20, 1835	Wood, Sandusky, and Huron Counties	Robert Lucas (1781–1853), Governor of Ohio when the county was created	425,484	340.46 sq mi (882 km2)
Madison County	097	London	Mar 1, 1810	Franklin County	James Madison (1751–1836), fourth President of the United States	44,602	465.44 sq mi (1,205 km2)
Mahoning County	099	Youngstown	Mar 1, 1846	Columbiana and Trumbull Counties	Mahoning River, from a Lenape word meaning "at the licks"	225,596	415.25 sq mi (1,075 km2)
Marion County	101	Marion	Apr 1, 1820	Delaware County	General Francis Marion (1732–1795), lieutenant colonel in the Continental Army and later brigadier general in the American Revolutionary War