Le Contee dell'Ohio sono le 88 suddivisioni principali dello Stato. I capoluoghi sono tra parentesi. I numeri mostrati appaiono nella parte bassa delle targhe automobilistiche e sono usati anche per altri codici amministrativi.
Dopo il nome del capoluogo e le eventuali note è mostrato il numero di township della contea, escluse le paper township.
Adams (West Union) — 15 Allen (Lima) — 10 Ashland (Ashland) — 15 Ashtabula (Jefferson) — 27 Athens (Athens) — 14 Auglaize (Wapakoneta) — 14 Belmont (St. Clairsville) — 16 Brown (Georgetown) — 16 Butler (Hamilton) — 13 Carroll (Carrollton) — 14 Champaign (Urbana) — 12 Clark (Springfield) — 10 Clermont (Batavia) — 14 Clinton (Wilmington) — 13 Columbiana (Lisbon) — 18 Coshocton (Coshocton) — 22 Crawford (Bucyrus) — 16 Cuyahoga (Cleveland, la più grande area metropolitana dell'Ohio) — 2 Darke (Greenville) — 20 Defiance (Defiance) — 12 Delaware (Delaware) — 18 Erie (Sandusky) — 9 Fairfield (Lancaster) — 13 Fayette (Washington Court House) — 10 Franklin (Columbus) — 17 Fulton (Wauseon) — 12 Gallia (Gallipolis) — 15 Geauga (Chardon) — 16 Greene (Xenia) — 11 Guernsey (Cambridge) — 19 Hamilton (Cincinnati) — 12 Hancock (Findlay) — 17 Hardin (Kenton) — 15 Harrison (Cadiz) — 15 Henry County (Napoleon) — 13 Highland (Hillsboro) — 17 Hocking (Logan) — 11 Holmes (Millersburg) — 14 Huron (Norwalk) — 19 Jackson (Jackson) — 12 Jefferson (Steubenville) — 14 Knox (Mount Vernon) — 22 Lake (Painesville) — 5 Lawrence (Ironton) — 14 Licking (Newark) — 25 Logan (Bellefontaine) — 17 Lorain (Elyria) — 18 Lucas (Toledo) — 11 Madison (London) — 14 Mahoning (Youngstown) — 14 Marion (Marion) — 15 Medina (Medina) — 17 Meigs (Pomeroy) — 12 Mercer (Celina) — 14 Miami (Troy) — 12 Monroe (Woodsfield) — 18 Montgomery (Dayton) — 9 Morgan (McConnelsville) — 14 Morrow (Mount Gilead) — 16 Muskingum (Zanesville) — 25 Noble (Caldwell) — 15 Ottawa (Port Clinton) — 12 Paulding (Paulding) — 12 Perry (New Lexington) — 14 Pickaway (Circleville) — 15 Pike (Waverly) — 14 Portage (Ravenna) — 18 Preble (Eaton) — 12 Putnam (Ottawa) — 15 Richland (Mansfield) — 18 Ross (Chillicothe) — 16 Sandusky (Fremont) — 12 Scioto (Portsmouth) — 16 Seneca (Tiffin) — 15 Shelby (Sidney) — 14 Stark (Canton) — 17 Summit (Akron) — 9 Trumbull (Warren) — 24 Tuscarawas (New Philadelphia) — 22 Union (Marysville) — 14 Van Wert (Van Wert) — 12 Vinton (McArthur) — 12 Warren (Lebanon) — 11 Washington (Marietta) — 22 Wayne (Wooster) — 16 Williams (Bryan) — 12 Wood (Bowling Green) — 19 Wyandot (Upper Sandusky) — 13
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