List of counties in Ohio

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]

Counties of Ohio

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 2022 vintage Census population estimates. The population of Ohio was 11,756,058 at that time, a decrease of 0.4% from 2020. The average population of Ohio's counties was 133,592; Franklin County was the most populous (1,321,820) and Vinton County was the least (12,565). 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
County
 FIPS code[10] County Seat[11] Est.[12] Origin[13] Etymology[12][13] Population[10][11][14] Area[11] Map
Adams County 001 West UnionJul 10, 1797Hamilton CountyJohn Adams (1735–1826), President of the United States when the county was organized 27,420 583.91 sq mi
(1,512 km2)		State map highlighting Adams County
Allen County 003 LimaMar 1, 1820Shelby CountyJohn Allen (1771/2-1813), a War of 1812 colonel[15] 101,115 404.43 sq mi
(1,047 km2)		State map highlighting Allen County
Ashland County 005 AshlandFeb 24, 1846Wayne, Richland, Huron, and Lorain CountiesAshland, home of U.S. Senator from Kentucky Henry Clay 52,181 424.37 sq mi
(1,099 km2)		State map highlighting Ashland County
Ashtabula County 007 JeffersonJun 7, 1807Trumbull and Geauga CountiesAshtabula River, which means "fish river" in an Algonquian language[16] 97,014 702.44 sq mi
(1,819 km2)		State map highlighting Ashtabula County
Athens County 009 AthensMar 1, 1805Washington CountyAthens in Greece 58,979 506.76 sq mi
(1,313 km2)		State map highlighting Athens County
Auglaize County 011 WapakonetaFeb 14, 1848Allen, Mercer, Darke, Hardin, Logan, Shelby, and Van Wert CountiesAuglaize River, which means "fallen timbers river" in the Shawnee Indian language 45,948 401.25 sq mi
(1,039 km2)		State map highlighting Auglaize County
Belmont County 013 St. ClairsvilleSep 7, 1801Jefferson and Washington CountiesFrench for "beautiful mountain" 65,509 537.35 sq mi
(1,392 km2)		State map highlighting Belmont County
Brown County 015 GeorgetownMar 1, 1818Adams and Clermont CountiesGeneral Jacob Brown (1775–1828), an officer of the War of 1812 43,680 491.76 sq mi
(1,274 km2)		State map highlighting Brown County
Butler County 017 HamiltonMay 1, 1803Hamilton CountyGeneral Richard Butler (1743–1791), killed at the Battle of the Wabash 388,420 467.27 sq mi
(1,210 km2)		State map highlighting Butler County
Carroll County 019 CarrolltonJan 1, 1833Columbiana, Stark, Harrison, Jefferson, and Tuscarawas CountiesCharles Carroll (1737–1832), last surviving signer of the United States Declaration of Independence 26,659 394.67 sq mi
(1,022 km2)		State map highlighting Carroll County
Champaign County 021 UrbanaMar 1, 1805Greene and Franklin CountiesFrench for "a plain", describing the land in the area 38,709 428.56 sq mi
(1,110 km2)		State map highlighting Champaign County
Clark County 023 SpringfieldMar 1, 1818Champaign, Madison, and Greene CountiesGeneral George Rogers Clark (1752–1818), defeated the Shawnee Indians in a battle near the Springfield area 134,831 399.86 sq mi
(1,036 km2)		State map highlighting Clark County
Clermont County 025 BataviaDec 6, 1800Hamilton CountyFrench for "clear mountain" 210,805 451.99 sq mi
(1,171 km2)		State map highlighting Clermont County
Clinton County 027 WilmingtonMar 1, 1810Highland and Warren CountiesGeorge Clinton (1739–1812), vice-president when the county was organized 41,964 410.88 sq mi
(1,064 km2)		State map highlighting Clinton County
Columbiana County 029 LisbonMay 1, 1803Jefferson and Washington CountiesChristopher Columbus, European explorer of the Americas 100,511 532.46 sq mi
(1,379 km2)		State map highlighting Columbiana County
Coshocton County 031 CoshoctonJan 31, 1810Muskingum and Tuscarawas CountiesDelaware Indian word meaning "union of waters" 36,571 564.07 sq mi
(1,461 km2)		State map highlighting Coshocton County
Crawford County 033 BucyrusApr 1, 1820Delaware CountyColonel William Crawford (1732–1782), Revolutionary War officer 41,522 402.11 sq mi
(1,041 km2)		State map highlighting Crawford County
Cuyahoga County 035 ClevelandJun 7, 1807Geauga CountyCuyahoga River, which means "crooked river" in an Iroquoian language[17] 1,236,041 458.49 sq mi
(1,187 km2)		State map highlighting Cuyahoga County
Darke County 037 GreenvilleJan 3, 1809Miami CountyGeneral William Darke (1736–1801), Revolutionary War officer 51,529 599.80 sq mi
(1,553 km2)		State map highlighting Darke County
Defiance County 039 DefianceApr 7, 1845Williams, Henry, and Paulding CountiesFort Defiance, built in 1794 by General Anthony Wayne 38,187 411.16 sq mi
(1,065 km2)		State map highlighting Defiance County
Delaware County 041 DelawareApr 1, 1808Franklin CountyDelaware Indians 226,296 442.41 sq mi
(1,146 km2)		State map highlighting Delaware County
Erie County 043 SanduskyMar 15, 1838Huron and Sandusky CountiesErie Indians 74,501 254.88 sq mi
(660 km2)		State map highlighting Erie County
Fairfield County 045 LancasterDec 9, 1800Ross and Washington CountiesNamed for the beauty of its "fair fields" 162,898 505.11 sq mi
(1,308 km2)		State map highlighting Fairfield County
Fayette County 047 Washington Court HouseMar 1, 1810Ross and Highland CountiesGilbert du Motier, marquis de La Fayette, French military officer and aristocrat who participated in both the American and French revolutions 28,839 406.58 sq mi
(1,053 km2)		State map highlighting Fayette County
Franklin County 049 ColumbusApr 30, 1803Ross and Wayne CountiesBenjamin Franklin (1706–1791), Founding Father, author, printer, political theorist, scientist, inventor, and statesman 1,321,820 539.87 sq mi
(1,398 km2)		State map highlighting Franklin County
Fulton County 051 WauseonApr 1, 1850Lucas, Henry, and Williams CountiesRobert Fulton (1765–1815), inventor of the steamboat[18] 42,171 406.78 sq mi
(1,054 km2)		State map highlighting Fulton County
Gallia County 053 GallipolisApr 30, 1803Washington and Adams CountiesGaul, the ancient name of France 29,068 468.78 sq mi
(1,214 km2)		State map highlighting Gallia County
Geauga County 055 ChardonMar 1, 1806Trumbull CountyAn Indian word meaning "raccoon" 95,469 403.66 sq mi
(1,045 km2)		State map highlighting Geauga County
Greene County 057 XeniaMay 1, 1803Hamilton and Ross CountiesGeneral Nathanael Greene (1742–1786), Revolutionary War officer 168,456 414.88 sq mi
(1,075 km2)		State map highlighting Greene County
Guernsey County 059 CambridgeMar 1, 1810Belmont and Muskingum CountiesIsland of Guernsey, from where most of the settlers originated 38,098 521.90 sq mi
(1,352 km2)		State map highlighting Guernsey County
Hamilton County 061 CincinnatiJan 2, 1790One of the original countiesAlexander Hamilton (1755/7-1804), Secretary of the Treasury when the county was organized 825,037 407.36 sq mi
(1,055 km2)		State map highlighting Hamilton County
Hancock County 063 FindlayApr 1, 1820Logan CountyJohn Hancock (1737–1793), president of the Continental Congress 74,861 531.35 sq mi
(1,376 km2)		State map highlighting Hancock County
Hardin County 065 KentonApr 1, 1820Logan CountyGeneral John Hardin (1753–1792), Revolutionary War officer 30,416 470.29 sq mi
(1,218 km2)		State map highlighting Hardin County
Harrison County 067 CadizFeb 1, 1813Jefferson and Tuscarawas CountiesGeneral William Henry Harrison (1773–1841), an officer of the War of 1812 and future President of the United States 14,378 403.53 sq mi
(1,045 km2)		State map highlighting Harrison County
Henry County 069 NapoleonApr 1, 1820Shelby CountyPatrick Henry (1736–1799), Revolutionary War-era legislator, orator, and scholar 27,512 416.50 sq mi
(1,079 km2)		State map highlighting Henry County
Highland County 071 HillsboroMay 1, 1805Ross, Adams, and Clermont CountiesDescriptive of the county's terrain 43,391 553.28 sq mi
(1,433 km2)		State map highlighting Highland County
Hocking County 073 LoganMar 1, 1818Athens, Ross, and Fairfield CountiesPossibly derived from the Delaware Indian word "Hoch-Hoch-ing", meaning "bottle" 27,858 422.75 sq mi
(1,095 km2)		State map highlighting Hocking County
Holmes County 075 MillersburgJan 20, 1824Coshocton, Wayne, and Tuscarawas CountiesMajor Andrew Holmes (died 1814), a War of 1812 officer 44,390 422.99 sq mi
(1,096 km2)		State map highlighting Holmes County
Huron County 077 NorwalkMar 7, 1809Portage and Cuyahoga CountiesHuron Indians 58,218 492.69 sq mi
(1,276 km2)		State map highlighting Huron County
Jackson County 079 JacksonMar 1, 1816Scioto, Gallia, Athens, and Ross CountiesGeneral Andrew Jackson (1767–1845), future President of the United States 32,586 420.28 sq mi
(1,089 km2)		State map highlighting Jackson County
Jefferson County 081 SteubenvilleJul 29, 1797Washington CountyThomas Jefferson (1743–1826), Vice President when the county was organized, future President of the United States, and principal author of the Declaration of Independence 64,330 409.61 sq mi
(1,061 km2)		State map highlighting Jefferson County
Knox County 083 Mount VernonMar 1, 1808Fairfield CountyGeneral Henry Knox, the first Secretary of War 63,183 527.12 sq mi
(1,365 km2)		State map highlighting Knox County
Lake County 085 PainesvilleMar 6, 1840Geauga and Cuyahoga CountiesIts location on Lake Erie 231,842 228.21 sq mi
(591 km2)		State map highlighting Lake County
Lawrence County 087 IrontonDec 21, 1815Gallia and Scioto CountiesCaptain James Lawrence (1781–1813), naval hero in the War of 1812 56,653 454.96 sq mi
(1,178 km2)		State map highlighting Lawrence County
Licking County 089 NewarkMar 1, 1808Fairfield CountyLicking 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] 181,359 686.50 sq mi
(1,778 km2)		State map highlighting Licking County
Logan County 091 BellefontaineMar 1, 1818Champaign CountyGeneral Benjamin Logan (c. 1742 – 1802), who destroyed Shawnee Indian towns in the county 46,040 458.44 sq mi
(1,187 km2)		State map highlighting Logan County
Lorain County 093 ElyriaDec 26, 1822Huron, Cuyahoga, and Medina CountiesProvince of Lorraine, France 316,268 492.50 sq mi
(1,276 km2)		State map highlighting Lorain County
Lucas County 095 ToledoJun 20, 1835Wood, Sandusky, and Huron CountiesRobert Lucas (1781–1853), Governor of Ohio when the county was created 426,643 340.46 sq mi
(882 km2)		State map highlighting Lucas County
Madison County 097 LondonMar 1, 1810Franklin CountyJames Madison (1751–1836), fourth President of the United States 43,540 465.44 sq mi
(1,205 km2)		State map highlighting Madison County
Mahoning County 099 YoungstownMar 1, 1846Columbiana and Trumbull CountiesMahoning River, from a Lenape word meaning "at the licks" 225,636 415.25 sq mi
(1,075 km2)		State map highlighting Mahoning County
Marion County 101 MarionApr 1, 1820Delaware CountyGeneral Francis Marion (1732–1795), lieutenant colonel in the Continental Army and later brigadier general in the American Revolutionary War 64,642 403.84 sq mi
(1,046 km2)		State map highlighting Marion County
Medina County 103 MedinaFeb 18, 1812Portage CountyMedina, world-renowned religious site in western Saudi Arabia 183,512 423 sq mi
(1,096 km2)		State map highlighting Medina County
Meigs County 105 PomeroyApr 1, 1819Gallia and Athens CountiesReturn Jonathan Meigs Jr. (1764–1825), Governor of Ohio and Postmaster General at the time the county was organized 21,969 429.42 sq mi
(1,112 km2)		State map highlighting Meigs County
Mercer County 107 CelinaApr 1, 1820Darke CountyGeneral Hugh Mercer (1726–1777), a Revolutionary War officer 42,348 463.27 sq mi
(1,200 km2)		State map highlighting Mercer County
Miami County 109 TroyMar 1, 1807Montgomery CountyMiami Indians 110,247 407.04 sq mi
(1,054 km2)		State map highlighting Miami County
Monroe County 111 WoodsfieldJan 29, 1813Belmont, Washington, and Guernsey CountiesJames Monroe (1758–1831), Secretary of State when the county was organized and future President of the United States 13,234 455.54 sq mi
(1,180 km2)		State map highlighting Monroe County
Montgomery County 113 DaytonMay 1, 1803Hamilton and Wayne CountiesGeneral Richard Montgomery (1738–1775), a Revolutionary War officer 533,892 461.68 sq mi
(1,196 km2)		State map highlighting Montgomery County
Morgan County 115 McConnelsvilleDec 29, 1817Washington, Guernsey, and Muskingum CountiesGeneral Daniel Morgan (c. 1735 – 1802), a Revolutionary War officer 13,668 417.66 sq mi
(1,082 km2)		State map highlighting Morgan County
Morrow County 117 Mount GileadMar 1, 1848Knox, Marion, Delaware, and Richland CountiesJeremiah Morrow (1771–1852), Governor of Ohio 35,339 406.22 sq mi
(1,052 km2)		State map highlighting Morrow County
Muskingum County 119 ZanesvilleMar 1, 1804[20][21]Washington and Fairfield CountiesAn Indian word meaning "A town by the river" or "by the river side" 86,113 664.63 sq mi
(1,721 km2)		State map highlighting Muskingum County
Noble County 121 CaldwellApr 1, 1851Monroe, Washington, Morgan, and Guernsey CountiesJames Noble, an early settler in the area 14,335 399.00 sq mi
(1,033 km2)		State map highlighting Noble County
Ottawa County 123 Port ClintonMar 6, 1840Erie, Sandusky, and Lucas CountiesNamed for the Ottawa Indians; Ottawa means "trader" in their language 39,978 254.95 sq mi
(660 km2)		State map highlighting Ottawa County
Paulding County 125 PauldingApr 1, 1820Darke CountyJohn Paulding (1758–1818), captor of spy John André during the Revolutionary War 18,757 416.26 sq mi
(1,078 km2)		State map highlighting Paulding County
Perry County 127 New LexingtonMar 1, 1818Washington, Fairfield, and Muskingum CountiesCommodore Oliver Hazard Perry (1785–1819), a naval officer of the War of 1812 35,480 409.78 sq mi
(1,061 km2)		State map highlighting Perry County
Pickaway County 129 CirclevilleMar 1, 1810Ross, Fairfield, and Franklin CountiesA misspelling of the Piqua tribe, a branch of the Shawnee 60,023 501.91 sq mi
(1,300 km2)		State map highlighting Pickaway County
Pike County 131 WaverlyFeb 1, 1815Ross, Scioto, and Adams CountiesGeneral Zebulon M. Pike (1779–1813), a War of 1812 officer and discoverer of Pikes Peak in Colorado in 1806 27,005 441.49 sq mi
(1,143 km2)		State map highlighting Pike County
Portage County 133 RavennaJun 7, 1807Trumbull CountyDerived from an Indian portage 161,745 492.39 sq mi
(1,275 km2)		State map highlighting Portage County
Preble County 135 EatonMar 1, 1808Montgomery and Butler CountiesCaptain Edward Preble (1761–1807), a Naval commander in the Revolutionary War 40,596 424.80 sq mi
(1,100 km2)		State map highlighting Preble County
Putnam County 137 OttawaApr 1, 1820Shelby CountyGeneral Israel Putnam (1718–1790), a Revolutionary War officer 34,334 483.87 sq mi
(1,253 km2)		State map highlighting Putnam County
Richland County 139 MansfieldMar 1, 1808Fairfield CountyDescriptive of the soil in the area 125,319 496.88 sq mi
(1,287 km2)		State map highlighting Richland County
Ross County 141 ChillicotheAug 20, 1798Adams and Washington CountiesNamed for U.S. Senator from Pennsylvania James Ross by territorial governor Arthur St. Clair 76,606 688.41 sq mi
(1,783 km2)		State map highlighting Ross County
Sandusky County 143 FremontApr 1, 1820Huron CountyAn Iroquois word meaning "cold water" 58,667 409.18 sq mi
(1,060 km2)		State map highlighting Sandusky County
Scioto County 145 PortsmouthMay 1, 1803Adams CountyScioto River; Scioto is a Wyandot Indian word meaning "deer" 72,194 612.27 sq mi
(1,586 km2)		State map highlighting Scioto County
Seneca County 147 TiffinApr 1, 1820Huron CountySeneca Indians, who had a reservation in the county area at the time 54,632 550.59 sq mi
(1,426 km2)		State map highlighting Seneca County
Shelby County 149 SidneyApr 1, 1819Miami CountyGeneral Isaac Shelby (1750–1826), a Revolutionary War officer and Governor of Kentucky 47,671 409.27 sq mi
(1,060 km2)		State map highlighting Shelby County
Stark County 151 CantonFeb 13, 1808Columbiana CountyGeneral John Stark (1728–1822), a Revolutionary War officer; known as the "Hero of Bennington" for his exemplary service at the Battle of Bennington in 1777 372,657 576.14 sq mi
(1,492 km2)		State map highlighting Stark County
Summit County 153 AkronMar 3, 1840Medina, Portage, and Stark CountiesIts location at the highest elevation along the Ohio and Erie Canal 535,882 419.38 sq mi
(1,086 km2)		State map highlighting Summit County
Trumbull County 155 WarrenJul 10, 1800Jefferson and Wayne CountiesJonathan Trumbull (1710–1785), Governor of Connecticut when the county was organized 200,643 616.48 sq mi
(1,597 km2)		State map highlighting Trumbull County
Tuscarawas County 157 New PhiladelphiaMar 15, 1808Muskingum CountyTuscarawas River, meaning "open mouth river"
or
the Tuscarawas tribe who lived on the river		 91,937 567.58 sq mi
(1,470 km2)		State map highlighting Tuscarawas County
Union County 159 MarysvilleApr 1, 1820Delaware, Franklin, Logan, and Madison CountiesIts formation by a union of four counties 66,898 436.65 sq mi
(1,131 km2)		State map highlighting Union County
Van Wert County 161 Van WertApr 1, 1820Darke CountyIsaac Van Wart (1760–1828), captor of spy John André during the Revolutionary War 28,769 410.09 sq mi
(1,062 km2)		State map highlighting Van Wert County
Vinton County 163 McArthurMar 23, 1850Athens, Gallia, Hocking, Jackson, and Ross CountiesSamuel Finley Vinton (1792–1862), Ohio Statesman and U.S. Congressman 12,565 414.08 sq mi
(1,072 km2)		State map highlighting Vinton County
Warren County 165 LebanonMay 1, 1803Hamilton CountyGeneral Joseph Warren (1741–1775), a Revolutionary War officer 249,778 399.63 sq mi
(1,035 km2)		State map highlighting Warren County
Washington County 167 MariettaJul 27, 1788One of the original countiesGeorge Washington (1732–1799), commander of the Continental Army, president of the Constitutional Convention, and future President of the United States 58,901 635.15 sq mi
(1,645 km2)		State map highlighting Washington County
Wayne County 169 WoosterMar 1, 1812Stark CountyGeneral Anthony Wayne (1745–1796), a Revolutionary War officer 116,559 555.36 sq mi
(1,438 km2)		State map highlighting Wayne County
Williams County 171 BryanApr 1, 1820Darke CountyDavid Williams (1754–1831), captor of spy John André during the Revolutionary War 36,652 421.74 sq mi
(1,092 km2)		State map highlighting Williams County
Wood County 173 Bowling GreenApr 1, 1820Refactored from non-county territoryEleazer D. Wood (1783–1814), founder of Fort Meigs 131,592 617.32 sq mi
(1,599 km2)		State map highlighting Wood County
Wyandot County 175 Upper SanduskyFeb 3, 1845Marion, Crawford, and Hardin CountiesWyandot Indians 21,567 405.61 sq mi
(1,051 km2)		State map highlighting Wyandot County

List of county codes

The Federal Information Processing Standard (FIPS) is used by the U.S. government to uniquely identify counties. In the following table, these codes link to the United States Census Bureau's "quick facts" for each county. Ohio's FIPS code of 39 is used to distinguish from counties in other states. For example, Adams County's unique nationwide identifier is 39001.[10]

Various state agencies identify counties by different coding schemes. The Ohio Department of Taxation assigns consecutive numbers for the purpose of enumerating taxing districts.[22] The Ohio Department of Public Safety, including the Ohio Bureau of Motor Vehicles, associates these county numbers with vehicle registrations.[23] The Department of Transportation uses three-letter abbreviations in road inventory and traffic management applications.[24] For historic preservation purposes, Ohio History Connection refers to counties by two- and three-letter abbreviations in the Ohio Archaeological Inventory and Ohio Historic Inventory, respectively.[25]

CountyFIPS codeODPS[23]/ODT[22] codeOAI[25] codeODOT[24]/OHI[25] code
Adams County00101ADADA
Allen County00302ALALL
Ashland County00503ASASD
Ashtabula County00704ABATB
Athens County00905ATATH
Auglaize County01106AUAUG
Belmont County01307BLBEL
Brown County01508BRBRO
Butler County01709BUBUT
Carroll County01910CACAR
Champaign County02111CHCHP
Clark County02312CLCLA
Clermont County02513CTCLE
Clinton County02714CNCLI
Columbiana County02915COCOL
Coshocton County03116CSCOS
Crawford County03317CRCRA
Cuyahoga County03518CUCUY
Darke County03719DADAR
Defiance County03920DEDEF
Delaware County04121DLDEL
Erie County04322ERERI
Fairfield County04523FAFAI
Fayette County04724FEFAY
Franklin County04925FRFRA
Fulton County05126FUFUL
Gallia County05327GAGAL
Geauga County05528GEGEA
Greene County05729GRGRE
Guernsey County05930GUGUE
Hamilton County06131HAHAM
Hancock County06332HKHAN
Hardin County06533HRHAR
Harrison County06734HNHAS
Henry County06935HYHEN
Highland County07136HIHIG
Hocking County07337HOHOC
Holmes County07538HSHOL
Huron County07739HUHUR
Jackson County07940JAJAC
Jefferson County08141JEJEF
Knox County08342KNKNO
Lake County08543LALAK
Lawrence County08744LELAW
Licking County08945LILIC
Logan County09146LOLOG
Lorain County09347LNLOR
Lucas County09548LULUC
Madison County09749MAMAD
Mahoning County09950MHMAH
Marion County10151MNMAR
Medina County10352MEMED
Meigs County10553MSMEG
Mercer County10754MSMER
Miami County10955MIMIA
Monroe County11156MOMOE
Montgomery County11357MYMOT
Morgan County11558MGMRG
Morrow County11759MWMRW
Muskingum County11960MUMUS
Noble County12161NONOB
Ottawa County12362OTOTT
Paulding County12563PAPAU
Perry County12764PEPER
Pickaway County12965PIPIC
Pike County13166PKPIK
Portage County13367POPOR
Preble County13568PRPRE
Putnam County13769PUPUT
Richland County13970RIRIC
Ross County14171ROROS
Sandusky County14372SASAN
Scioto County14573SCSCI
Seneca County14774SESEN
Shelby County14975SHSHE
Stark County15176STSTA
Summit County15377SUSUM
Trumbull County15578TRTRU
Tuscarawas County15779TUTUS
Union County15980UNUNI
Van Wert County16181VWVAN
Vinton County16382VIVIN
Warren County16583WAWAR
Washington County16784WNWAS
Wayne County16985WEWAY
Williams County17186WIWIL
Wood County17387WOWOO
Wyandot County17588WYWYA

See also

References
  1. Laning, J.F. (1896). "The Evolution of Ohio Counties". Ohio Archaeological and Historical Publications. V: 326–350. Archived from the original on 2015-11-21.. Other editions available at ISBN 1249686741 and Google Books
  2. Lawyer, James Patterson (1905). History of Ohio: From the Glacial Period to the Present Time. Press of F. J. Heer. p. 381. Retrieved 2007-08-18. Other editions available at ISBN 9781279183281
  3. Steinglass, Steven; Scarselli, Gino (2004). The Ohio State Constitution A Reference Guide. Westport, CT: Praeger Publishers. pp. 272–273. (OH county charter). Other editions available: ISBN 0313267650 and Google Books
  4. "Ohio Counties". County of Summit. 2011-11-15. Archived from the original on 2020-01-27. Retrieved 2013-02-28.{{cite web}}: CS1 maint: unfit URL (link)
  5. "Issue 6 reform wins big and sets in motion even bigger changes for Cuyahoga County". cleveland.com. 4 November 2009. Retrieved 2010-01-28.
  6. "OSBA - OSBA Staff Directory". www.ohiobar.org.
  7. "Title 3 - Ohio Revised Code | Ohio Laws".
  8. "Ohio QuickFacts". U.S. Census Bureau. Archived from the original on 2013-03-03. Retrieved 2013-02-27.
  9. "Population Estimates". U.S. Census Bureau. December 2009. Archived from the original on 2009-03-22. Retrieved 2013-02-27.
  10. "County FIPS Code Listing for the State of OHIO". United States Environmental Protection Agency. Retrieved 2016-07-09.
  11. "NACo - Find a County". Archived from the original on 2007-04-13. Retrieved 2007-07-22.
  12. "Federal Roster: Counties of Ohio, Derivation of Name and Date of Erection" (PDF). Archived from the original on 2013-07-12. Retrieved 2013-07-21.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
  13. Howe, Henry (1891). Historical Collections of Ohio. Vol. 2. Columbus, OH: Henry Howe and Son. (OH county source). Other editions available: ISBN 1425565735 and Google Books
  14. 2020 census
  15. Resolution of 111th Ohio General Assembly designating John Allen as the person for which Allen County was named.
  16. Ashtabula, Encyclopædia Britannica, 2007. Accessed 2007-11-19.
  17. Cuyahoga River, Encyclopædia Britannica, 2007. Accessed 2007-11-19.
  18. About Fulton County
  19. Mahr, August C. (April 1957). "Indian River and Place Names in Ohio". Ohio Archaeological and Historical Quarterly. 66 (2): 146–148.
  20. Downes, p. 368.
  21. Taylor & Taylor, p. 40.
  22. "Ohio Counties with County Number" (PDF). Columbus, Ohio: Ohio Department of Taxation. June 25, 2020. Retrieved September 11, 2023.
  23. Taxing District Code Book 2023 (PDF). Ohio Bureau of Motor Vehicles, Tax Distribution Section. January 3, 2023. Retrieved September 12, 2023.
  24. "ODOT County Abbreviation Table" (PDF). Ohio Department of Transportation. May 1, 2013. Retrieved December 21, 2014.
  25. "Ohio Archaeological Inventory Form Instruction Manual" (PDF). Ohio Historic Preservation Office. June 2003. p. 61. Retrieved September 12, 2023.

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