List of counties in Ohio

The US state of Ohio is divided into 88 counties . They are listed below with their county seat , the date of establishment and the namesake. The column "Origin" indicates from which other counties a new one was created.

county	FIPS code	County Seat	Founded	origin	Origin of name	population	surface	map
Adams County	001	West Union	July 10, 1797	Hamilton County	John Adams (1735–1826), president at the time the county was founded	27,330	1,512 km² ( 58,391 sq mi)
Allen County	003	Lima	March 1, 1820	Shelby County	John Allen (1771 / 1772–1813), soldier in the British-American War	108,473	1,047 km² ( 40,443 sq mi)
Ashland County	005	Ashland	February 24, 1846	Wayne, Richland, Huron, and Lorain Counties	Ashland, home of Henry Clay .	52,523	1,099 km² ( 42,437 sq mi)
Ashtabula County	007	Jefferson	June 7, 1807	Trumbull and Geauga Counties	Ashtabula River , the "river fish" in Algonquianisch means	102,728	1,819 km² ( 70,244 sq mi)
Athens County	009	Athens	March 1, 1805	Washington County	Athens	62,223	1,313 km² ( 50,676 sq mi)
Auglaize County	011	Wapakoneta	February 14, 1848	Allen, Mercer, Darke, Hardin, Logan, Shelby, and Van Wert Countys	Auglaize River , which means "river of fallen trees" for the Shawnee	46,611	1,039 km² ( 40,125 sq mi)
Belmont County	013	St. Clairsville	September 7, 1801	Jefferson and Washington Counties	Belle monte, French for "beautiful mountain"	70.226	1,392 km² ( 53,735 sq mi)
Brown County	015	Georgetown	March 1, 1818	Adams and Clermont Counties	General Jacob Brown (1775–1828), British-American War officer	42,285	1,274 km² ( 49,176 sq mi)
Butler County	017	Hamilton	May 1, 1803	Hamilton County	General Richard Butler (1743–1791), killed in the Battle of Wabash	332,807	1,210 km² ( 46,727 sq mi)
Carroll County	019	Carrollton	January 1, 1833	Columbiana, Stark, Harrison, Jefferson, and Tuscarawas Counties	Charles Carroll (1737–1832), last surviving signer of the Declaration of Independence	28,836	1,022 km² ( 39,467 sq mi)
Champaign County	021	Urbana	March 1, 1805	Greene and Franklin Counties	French for "level" as a description of the area	38,890	1,110 km² ( 42,856 sq mi)
Clark County	023	Springfield	March 1, 1818	Champaign, Madison, and Greene Countys	General George Rogers Clark (1752-1818), who defeated the Shawnee Indians at Springfield	144,742	1,036 km² ( 39,986 sq mi)
Clermont County	025	Batavia	December 6, 1800	Hamilton County	French for "free mountain"	177,977	1,171 km² ( 45,199 sq mi)
Clinton County	027	Wilmington	March 1, 1810	Highland and Warren Counties	George Clinton (1739–1812), vice president at the time of the county	40,543	1,064 km² ( 41,088 sq mi)
Columbiana County	029	Lisbon	May 1, 1803	Jefferson and Washington Counties	Derived from the names Christoph Columbus and Anna	112.075	1,379 km² ( 53,246 sq mi)
Coshocton County	031	Coshocton	January 31, 1810	Muskingum and Tuscarawas Counties	"Association of Waters" in the Delaware language	36,655	1,461 km² ( 56,407 sq mi)
Crawford County	033	Bucyrus	April 1, 1820	Delaware County	Officer William Crawford (1732–1782)	46,966	1,041 km² ( 40,211 sq mi)
Cuyahoga County	035	Cleveland	June 7, 1807	Geauga County	Cuyahoga River , the "Monkey River" in Iroquois means	1,393,978	1,187 km² ( 45,849 sq mi)
Darke County	037	Greenville	January 3, 1809	Miami County	General William Darke (1736–1801), officer in the War of Independence	53,309	1,553 km² ( 59,980 sq mi)
Defiance County	039	Defiance	April 7, 1845	Williams, Henry, and Paulding Counties	Fort Defiance , built by Anthony Wayne in 1794	39,500	1,065 km² ( 41,116 sq mi)
Delaware County	041	Delaware	April 1, 1808	Franklin County	Delaware Indians	110.106	1,146 km² ( 44,241 sq mi)
Erie County	043	Sandusky	March 15, 1838	Huron and Sandusky Counties	Erie Indians	79,551	660 km² ( 25,488 sq mi)
Fairfield County	045	Lancaster	December 9, 1800	Ross and Washington Counties	Named after the "beautiful fields"	122,759	1,308 km² ( 50,511 sq mi)
Fayette County	047	Washington Court House	March 1, 1810	Ross and Highland Counties	Marquis de Lafayette , French officer and aristocrat	28,433	1,053 km² ( 40,658 sq mi)
Franklin County	049	Columbus	April 30, 1803	Ross and Wayne Counties	Benjamin Franklin (1706-1791)	1,068,978	1,398 km² ( 53,987 sq mi)
Fulton County	051	Wauseon	April 1, 1850	Lucas, Henry, and Williams Counties	Robert Fulton (1765–1815), inventor of the steamship	42,084	1,054 km² ( 40,678 sq mi)
Gallia County	053	Gallipolis	April 30, 1803	Washington and Adams Counties	Gaul	31,069	1,214 km² ( 46,878 sq mi)
Geauga County	055	Chardon	March 1, 1806	Trumbull County	An Indian word for raccoon	90,895	1,045 km² ( 40,366 sq mi)
Greene County	057	Xenia	May 1, 1803	Hamilton and Ross Counties	General Nathanael Greene (1742–1786), officer in the War of Independence	147.886	1,075 km² ( 41,488 sq mi)
Guernsey County	059	Cambridge	March 1, 1810	Belmont and Muskingum Countys	guernsey	40,792	1,352 km² ( 52,190 sq mi)
Hamilton County	061	Cincinnati	January 2, 1790	One of the original counties	Alexander Hamilton (1755 / 1757-1804)	845.303	1,055 km² ( 40,736 sq mi)
Hancock County	063	Findlay	April 1, 1820	Logan County	John Hancock (1737-1793)	71,295	1,376 km² ( 53,135 sq mi)
Hardin County	065	Kenton	April 1, 1820	Logan County	General John Hardin (officer) (1753–1792)	31,945	1,218 km² ( 47,029 sq mi)
Harrison County	067	Cadiz	February 1, 1813	Jefferson and Tuscarawas Counties	General William H. Harrison (1773–1841)	15,856	1,045 km² ( 40,353 sq mi)
Henry County	069	Napoleon	April 1, 1820	Shelby County	Patrick Henry (1736–1799)	29.210	1,079 km² ( 41,650 sq mi)
Highland county	071	Hillsboro	May 1, 1805	Ross, Adams, and Clermont Counties	Description of the landscape	40,875	1,433 km² ( 55,328 sq mi)
Hocking County	073	Logan	March 1, 1818	Athens, Ross, and Fairfield Counties	Possibly from the Delaware Indian word "Hoch-Hoch-ing", which means "bottle"	28,241	1,095 km² ( 42,275 sq mi)
Holmes County	075	Millersburg	January 20, 1824	Coshocton, Wayne, and Tuscarawas Counties	Major Andrew Holmes († 1814)	38,943	1,096 km² ( 42,299 sq mi)
Huron County	077	Norwalk	March 7, 1809	Portage and Cuyahoga Counties	Huron Indians	59,847	1,276 km² ( 49,269 sq mi)
Jackson County	079	Jackson	March 1, 1816	Scioto, Gallia, Athens, and Ross Countys	General Andrew Jackson (1767-1845)	32,641	1,089 km² ( 42,028 sq mi)
Jefferson County	081	Steubenville	July 29, 1797	Washington County	Thomas Jefferson (1743-1826)	73,894	1,061 km² ( 40,961 sq mi)
Knox County	083	Mount Vernon	March 1, 1808	Fairfield County	General Henry Knox	54,500	1,365 km² ( 52,712 sq mi)
Lake County	085	Painesville	March 6, 1840	Geauga and Cuyahoga Counties	On the shores of Lake Erie	227,511	591 km² ( 22,821 sq mi)
Lawrence County	087	Ironton	December 21, 1815	Gallia and Scioto Counties	Captain James Lawrence (1781-1813)	62,319	1,178 km² ( 45,496 sq mi)
Licking County	089	Newark	March 1, 1808	Fairfield County	Named for the county salt licks	145.491	1,778 km² ( 68,650 sq mi)
Logan County	091	Bellefontaine	March 1, 1818	Champaign County	General Benjamin Logan (~ 1742–1802)	46.005	1,187 km² ( 45,844 sq mi)
Lorain County	093	Elyria	December 26, 1822	Huron, Cuyahoga, and Medina Counties	To Lorraine in France	284,664	1,276 km² ( 49,250 sq mi)
Lucas County	095	Toledo	June 20, 1835	Wood, Sandusky, and Huron Counties	Robert Lucas (1781–1853), Governor of Ohio	455.054	882 km² ( 34,046 sq mi)
Madison County	097	London	March 1, 1810	Franklin County	President James Madison (1751-1836)	40.213	1,205 km² ( 46,544 sq mi)
Mahoning County	099	Youngstown	March 1, 1846	Columbiana and Trumbull Counties	Mahoning River	257,555	1,075 km² ( 41,525 sq mi)
Marion County	101	Marion	April 1, 1820	Delaware County	General Francis Marion (1732–1795)	66,217	1,046 km² ( 40,384 sq mi)
Medina County	103	Medina	February 18, 1812	Portage County	Medina , capital of Al Madinah in Saudi Arabia	151,095	1,092 km² ( 42,155 sq mi)
Meigs County	105	Pomeroy	April 1, 1819	Gallia and Athens Counties	Return Jonathan Meigs Jr. (1764-1825)	23,072	1,112 km² ( 42,942 sq mi)
Mercer County	107	Celina	April 1, 1820	Darke County	General Hugh Mercer (1726–1777)	40,924	1,200 km² ( 46,327 sq mi)
Miami County	109	Troy	March 1, 1807	Montgomery County	Miami Indians	98,868	1,054 km² ( 40,704 sq mi)
Monroe County	111	Woodsfield	January 29, 1813	Belmont, Washington, and Guernsey Counties	James Monroe (1758-1831)	15,180	1,180 km² ( 45,554 sq mi)
Montgomery County	113	Dayton	May 1, 1803	Hamilton and Wayne Countys	General Richard Montgomery (1738-1775)	559.062	1,196 km² ( 46,168 sq mi)
Morgan County	115	McConnelsville	December 29, 1817	Washington, Guernsey, and Muskingum Counties	General Daniel Morgan (politician) Daniel Morgan (c.1735–1802)	14,897	1,082 km² ( 41,766 sq mi)
Morrow County	117	Mount Gilead	March 1, 1848	Knox, Marion, Delaware, and Richland Counties	Jeremiah Morrow (1771-1852), Governor of Ohio	31,628	1,052 km² ( 40,622 sq mi)
Muskingum County	119	Zanesville	March 1, 1803	Washington and Fairfield Counties	A local word for "village on the river" or a local word for "by the river"	84,585	1,721 km² ( 66,463 sq mi)
Noble County	121	Caldwell	April 1, 1851	Monroe, Washington, Morgan, and Guernsey Counties	John Noble (1785–1831), an early settler	14,058	1,033 km² ( 39,900 sq mi)
Ottawa County	123	Port Clinton	March 6, 1840	Erie, Sandusky, and Lucas Countys	Ottawa Indians	40,985	660 km² ( 25,495 sq mi)
Paulding County	125	Paulding	April 1, 1820	Darke County	John Paulding (1758-1818)	20,293	1,078 km² ( 41,626 sq mi)
Perry County	127	New Lexington	March 1, 1818	Washington, Fairfield, and Muskingum Counties	Commodore Oliver Hazard Perry (1785-1819)	34,078	1,061 km² ( 40,978 sq mi)
Pickaway County	129	Circleville	March 1, 1810	Ross, Fairfield, and Franklin Counties	Incorrect spelling for the Piqua tribe or a derivative of the Indian word "Piqua"	52,727	1,300 km² ( 50,191 sq mi)
Pike County	131	Waverly	February 1, 1815	Ross, Scioto, and Adams Counties	General Zebulon Pike (1779–1813), discoverer of Pikes Peak	27,695	44,149 sq mi (1,143 km² )
Portage County	133	Ravenna	June 7, 1807	Trumbull County	Portage , carrying canoes across the country	152.061	1,275 km² ( 49,239 sq mi)
Preble County	135	Eaton	March 1, 1808	Montgomery and Butler Counties	Captain Edward Preble (1761-1807)	42,337	1,100 km² ( 42,480 sq mi)
Putnam County	137	Ottawa	April 1, 1820	Shelby County	General Israel Putnam (1718–1790), officer in the War of Independence	34,726	1,253 km² ( 48,387 sq mi)
Richland County	139	Mansfield	March 1, 1808	Fairfield County	Description of the soil in this area	128,852	1,287 km² ( 49,688 sq mi)
Ross County	141	Chillicothe	August 20, 1798	Adams and Washington Counties	James Ross	73,345	1,783 km² ( 68,841 sq mi)
Sandusky County	143	Fremont	April 1, 1820	Huron County	An Iroquois word for "cold water"	61,792	1,060 km² ( 40,918 sq mi)
Scioto County	145	Portsmouth	May 1, 1803	Adams County	Scioto River ; The word means "deer" in the Wyandot language	79.195	1,586 km² ( 61,227 sq mi)
Seneca County	147	Tiffin	April 1, 1820	Huron County	Seneca Indians who lived here	58,683	1,426 km² ( 55,059 sq mi)
Shelby County	149	Sidney	April 1, 1819	Miami County	General Isaac Shelby (1750-1826)	47,910	1,060 km² ( 40,927 sq mi)
Stark County	151	Canton	February 13, 1808	Columbiana County	General John Stark (1728-1822)	378.098	1,492 km² ( 57,614 sq mi)
Summit County	153	Akron	March 3, 1840	Medina, Portage, and Stark Counties	Because this is where the Ohio Canal reaches its highest point	542.899	1,069 km² ( 41,272 sq mi)
Trumbull County	155	Warren	July 10, 1800	Jefferson and Wayne Countys	Jonathan Trumbull senior (1710–1785), Connecticut Governor	225.116	1,597 km² ( 61,648 sq mi)
Tuscarawas County	157	New Philadelphia	March 15, 1808	Muskingum County	Tuscarawas River , "Open Mouth River " or Tuscarawas Tribe	90.914	1,470 km² ( 56,758 sq mi)
Union County	159	Marysville	April 1, 1820	Delaware, Franklin, Logan, and Madison Counties	So named because it was merged from four other counties	40,909	1,131 km² ( 43,665 sq mi)
Van Wert County	161	Van worth	April 1, 1820	Darke County	Isaac Van Wart (1760–1828), who arrested the spy John André during the American Revolutionary War	29,659	1,062 km² ( 41,009 sq mi)
Vinton County	163	McArthur	March 23, 1850	Athens, Gallia, Hocking, Jackson, and Ross Countys	Samuel Finley Vinton (1792-1862)	12,806	1,072 km² ( 41,408 sq mi)
Warren County	165	Lebanon	May 1, 1803	Hamilton County	General Joseph Warren (1741–1775), officer in the American War of Independence	158.383	1,035 km² ( 39,963 sq mi)
Washington County	167	Marietta	July 27, 1788	One of the original counties	George Washington (1732–1799)	63.251	1,645 km² ( 63,515 sq mi)
Wayne County	169	Wooster	March 1, 1808	From an area not yet allocated	General Anthony Wayne (1745–1796), officer in the Revolutionary War	111,564	1,438 km² ( 55,536 sq mi)
Williams County	171	Bryan	April 1, 1820	Darke County	David Williams (1754-1831)	39,188	1,092 km² ( 42,174 sq mi)
Wood County	173	Bowling green	April 1, 1820	From an area not yet allocated	Eleazer D. Wood (1783-1814), founder of Fort Meigs	121.065	1,599 km² ( 61,732 sq mi)
Wyandot County	175	Upper Sandusky	February 3, 1845	Marion, Crawford, and Hardin Countys	Wyandot Indians	22,908	1,051 km² ( 40,561 sq mi)

Individual evidence

1. ↑ ^{a b} EPA County FIPS Code Listing . EPA. Retrieved April 9, 2007.
2. ↑ ^{a b c d} NACo - Find a County . Archived from the original on July 12, 2008. Retrieved July 22, 2007.
3. ↑ ^{a b} Federal Roster: Counties of Ohio, Derivation of Name and Date of erection . Archived from the original on February 28, 2008. Retrieved July 22, 2007.
4. ↑ ^{a b} Ohio Genealogy Clickable Map County . Archived from the original on June 9, 2008. Retrieved July 25, 2007. [no longer available]
5. ^ The origin of Ohio's country names . rootsweb. Retrieved March 22, 2009.
6. ^ Resolution of 111th Ohio General Assembly designating John Allen as the person for which Allen County was named
7. ^ Ashtabula , Encyclopædia Britannica , 2007. Retrieved November 19, 2007
8. ^ Cuyahoga River , Encyclopædia Britannica , 2007. Retrieved November 19, 2007