# 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. A tenth county, Wayne, was established on August 15, 1796, and encompassed roughly the present state of Michigan. 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.
The Ohio Constitution allows counties to set up a charter government as many cities and villages do, but only Summit and Cuyahoga counties have done so, the latter having been approved by voters in November 2009. 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.
Population figures are based on the 2024 vintage Census population estimates. The population of Ohio was 11,883,304 at that time, an increase of 0.7% from 2020. The average population of Ohio's counties was 135,038; Franklin County was the most populous (1,356,303) and Vinton County was the least (12,545). The average land area is 464 sq mi (1,200 km$^2$). The largest county by area is Ashtabula County at 702.44 sq mi (1,819.3 km$^2$), and its neighbor, Lake County, is the smallest at 228.21 sq mi (591.1 km$^2$). The total area of the state is 40,860.69 sq mi (105,828.7 km$^2$).

## List of counties

| County | FIPS code | County Seat | Est. | Origin | Etymology | Population (2024) | Area |
| Adams County | 001 | West Union | Jul 10, 1797 | Hamilton County | John Adams (1735–1826), President of the United States when the county was organized | 27,671 | 583.91 sq mi (1,512 km$^2$) |
| Allen County | 003 | Lima | Mar 1, 1820 | Shelby County | John Allen (1771/2-1813), a War of 1812 colonel | 100,866 | 404.43 sq mi (1,047 km$^2$) |
| Ashland County | 005 | Ashland | Feb 24, 1846 | Wayne, Richland, Huron, and Lorain Counties | Ashland, home of U.S. Senator from Kentucky Henry Clay | 52,420 | 424.37 sq mi (1,099 km$^2$) |
| Ashtabula County | 007 | Jefferson | Jun 7, 1807 | Trumbull and Geauga Counties | Ashtabula River, which means "fish river" in an Algonquian language | 96,906 | 702.44 sq mi (1,819 km$^2$) |
| Athens County | 009 | Athens | Mar 1, 1805 | Washington County | Athens in Greece | 63,218 | 506.76 sq mi (1,313 km$^2$) |
| 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 | 45,922 | 401.25 sq mi (1,039 km$^2$) |
| Belmont County | 013 | St. Clairsville | Sep 7, 1801 | Jefferson and Washington Counties | French for "beautiful mountain" | 64,692 | 537.35 sq mi (1,392 km$^2$) |
| Brown County | 015 | Georgetown | Mar 1, 1818 | Adams and Clermont Counties | General Jacob Brown (1775–1828), an officer of the War of 1812 | 44,292 | 491.76 sq mi (1,274 km$^2$) |
| Butler County | 017 | Hamilton | May 1, 1803 | Hamilton County | General Richard Butler (1743–1791), killed at the Battle of the Wabash | 399,542 | 467.27 sq mi (1,210 km$^2$) |
| 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 | 26,460 | 394.67 sq mi (1,022 km$^2$) |
| Champaign County | 021 | Urbana | Mar 1, 1805 | Greene and Franklin Counties | French for "a plain", describing the land in the area | 38,907 | 428.56 sq mi (1,110 km$^2$) |
| 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 | 134,985 | 399.86 sq mi (1,036 km$^2$) |
| Clermont County | 025 | Batavia | Dec 6, 1800 | Hamilton County | French for "clear mountain" | 214,123 | 451.99 sq mi (1,171 km$^2$) |
| Clinton County | 027 | Wilmington | Mar 1, 1810 | Highland and Warren Counties | George Clinton (1739–1812), vice-president when the county was organized | 42,019 | 410.88 sq mi (1,064 km$^2$) |
| Columbiana County | 029 | Lisbon | May 1, 1803 | Jefferson and Washington Counties | Christopher Columbus, European explorer of the Americas | 99,823 | 532.46 sq mi (1,379 km$^2$) |
| Coshocton County | 031 | Coshocton | Jan 31, 1810 | Muskingum and Tuscarawas Counties | Delaware Indian word meaning "union of waters" | 37,003 | 564.07 sq mi (1,461 km$^2$) |
| Crawford County | 033 | Bucyrus | Apr 1, 1820 | Delaware County | Colonel William Crawford (1732–1782), Revolutionary War officer | 41,626 | 402.11 sq mi (1,041 km$^2$) |
| Cuyahoga County | 035 | Cleveland | Jun 7, 1807 | Geauga County | Cuyahoga River, which means "crooked river" in an Iroquoian language | 1,240,594 | 458.49 sq mi (1,187 km$^2$) |
| Darke County | 037 | Greenville | Jan 3, 1809 | Miami County | General William Darke (1736–1801), Revolutionary War officer | 51,462 | 599.80 sq mi (1,553 km$^2$) |
| Defiance County | 039 | Defiance | Apr 7, 1845 | Williams, Henry, and Paulding Counties | Fort Defiance, built in 1794 by General Anthony Wayne | 38,644 | 411.16 sq mi (1,065 km$^2$) |
| Delaware County | 041 | Delaware | Apr 1, 1808 | Franklin County | Delaware Indians | 237,966 | 442.41 sq mi (1,146 km$^2$) |
| Erie County | 043 | Sandusky | Mar 15, 1838 | Huron and Sandusky Counties | Erie Indians | 73,841 | 254.88 sq mi (660 km$^2$) |
| Fairfield County | 045 | Lancaster | Dec 9, 1800 | Ross and Washington Counties | Named for the beauty of its "fair fields" | 167,762 | 505.11 sq mi (1,308 km$^2$) |
| 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 | 28,782 | 406.58 sq mi (1,053 km$^2$) |
| 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 | 1,356,303 | 539.87 sq mi (1,398 km$^2$) |
| Fulton County | 051 | Wauseon | Apr 1, 1850 | Lucas, Henry, and Williams Counties | Robert Fulton (1765–1815), inventor of the steamboat | 42,028 | 406.78 sq mi (1,054 km$^2$) |
| Gallia County | 053 | Gallipolis | Apr 30, 1803 | Washington and Adams Counties | Gaul, the ancient name of France | 28,886 | 468.78 sq mi (1,214 km$^2$) |
| Geauga County | 055 | Chardon | Mar 1, 1806 | Trumbull County | A native american word meaning "raccoon" | 95,362 | 403.66 sq mi (1,045 km$^2$) |
| Greene County | 057 | Xenia | May 1, 1803 | Hamilton and Ross Counties | General Nathanael Greene (1742–1786), Revolutionary War officer | 172,347 | 414.88 sq mi (1,075 km$^2$) |
| Guernsey County | 059 | Cambridge | Mar 1, 1810 | Belmont and Muskingum Counties | Island of Guernsey, from where most of the settlers originated | 38,219 | 521.90 sq mi (1,352 km$^2$) |
| 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 | 837,359 | 407.36 sq mi (1,055 km$^2$) |
| Hancock County | 063 | Findlay | Apr 1, 1820 | Logan County | John Hancock (1737–1793), president of the Continental Congress | 75,016 | 531.35 sq mi (1,376 km$^2$) |
| Hardin County | 065 | Kenton | Apr 1, 1820 | Logan County | General John Hardin (1753–1792), Revolutionary War officer | 30,402 | 470.29 sq mi (1,218 km$^2$) |
| 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 | 14,042 | 403.53 sq mi (1,045 km$^2$) |
| Henry County | 069 | Napoleon | Apr 1, 1820 | Shelby County | Patrick Henry (1736–1799), Revolutionary War-era legislator, orator, and scholar | 27,536 | 416.50 sq mi (1,079 km$^2$) |
| Highland County | 071 | Hillsboro | May 1, 1805 | Ross, Adams, and Clermont Counties | Descriptive of the county's terrain | 43,785 | 553.28 sq mi (1,433 km$^2$) |
| Hocking County | 073 | Logan | Mar 1, 1818 | Athens, Ross, and Fairfield Counties | Possibly derived from the Delaware Indian word "Hoch-Hoch-ing", meaning "bottle" | 27,429 | 422.75 sq mi (1,095 km$^2$) |
| Holmes County | 075 | Millersburg | Jan 20, 1824 | Coshocton, Wayne, and Tuscarawas Counties | Major Andrew Holmes (died 1814), a War of 1812 officer | 44,668 | 422.99 sq mi (1,096 km$^2$) |
| Huron County | 077 | Norwalk | Mar 7, 1809 | Portage and Cuyahoga Counties | Huron Indians | 58,168 | 492.69 sq mi (1,276 km$^2$) |
| Jackson County | 079 | Jackson | Mar 1, 1816 | Scioto, Gallia, Athens, and Ross Counties | General Andrew Jackson (1767–1845), future President of the United States | 32,723 | 420.28 sq mi (1,089 km$^2$) |
| 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 | 63,900 | 409.61 sq mi (1,061 km$^2$) |
| Knox County | 083 | Mount Vernon | Mar 1, 1808 | Fairfield County | General Henry Knox, the first Secretary of War | 63,848 | 527.12 sq mi (1,365 km$^2$) |
| Lake County | 085 | Painesville | Mar 6, 1840 | Geauga and Cuyahoga Counties | Its location on Lake Erie | 232,360 | 228.21 sq mi (591 km$^2$) |
| Lawrence County | 087 | Ironton | Dec 21, 1815 | Gallia and Scioto Counties | Captain James Lawrence (1781–1813), naval hero in the War of 1812 | 55,829 | 454.96 sq mi (1,178 km$^2$) |
| 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" | 184,898 | 686.50 sq mi (1,778 km$^2$) |
| Logan County | 091 | Bellefontaine | Mar 1, 1818 | Champaign County | General Benjamin Logan (c. 1742 – 1802), who destroyed Shawnee Indian towns in the county | 46,085 | 458.44 sq mi (1,187 km$^2$) |
| Lorain County | 093 | Elyria | Dec 26, 1822 | Huron, Cuyahoga, and Medina Counties | Province of Lorraine, France | 322,030 | 492.50 sq mi (1,276 km$^2$) |
| Lucas County | 095 | Toledo | Jun 20, 1835 | Wood, Sandusky, and Huron Counties | Robert Lucas (1781–1853), Governor of Ohio when the county was created | 426,291 | 340.46 sq mi (882 km$^2$) |
| Madison County | 097 | London | Mar 1, 1810 | Franklin County | James Madison (1751–1836), fourth President of the United States | 45,531 | 465.44 sq mi (1,205 km$^2$) |
| Mahoning County | 099 | Youngstown | Mar 1, 1846 | Columbiana and Trumbull Counties | Mahoning River, from a Lenape word meaning "at the licks" | 225,786 | 415.25 sq mi (1,075 km$^2$) |
| 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 | 64,976 | 403.84 sq mi (1,046 km$^2$) |
| Medina County | 103 | Medina | Feb 18, 1812 | Portage County | Medina, world-renowned religious site in western Saudi Arabia | 184,625 | 423 sq mi (1,096 km$^2$) |
| Meigs County | 105 | Pomeroy | Apr 1, 1819 | Gallia and Athens Counties | Return Jonathan Meigs Jr. (1764–1825), Governor of Ohio and Postmaster General at the time the county was organized | 21,491 | 429.42 sq mi (1,112 km$^2$) |
| Mercer County | 107 | Celina | Apr 1, 1820 | Darke County | General Hugh Mercer (1726–1777), a Revolutionary War officer | 42,648 | 463.27 sq mi (1,200 km$^2$) |
| Miami County | 109 | Troy | Mar 1, 1807 | Montgomery County | Miami Indians | 111,950 | 407.04 sq mi (1,054 km$^2$) |
| Monroe County | 111 | Woodsfield | Jan 29, 1813 | Belmont, Washington, and Guernsey Counties | James Monroe (1758–1831), Secretary of State when the county was organized and future President of the United States | 13,051 | 455.54 sq mi (1,180 km$^2$) |
| Montgomery County | 113 | Dayton | May 1, 1803 | Hamilton and Wayne Counties | General Richard Montgomery (1738–1775), a Revolutionary War officer | 537,443 | 461.68 sq mi (1,196 km$^2$) |
| Morgan County | 115 | McConnelsville | Dec 29, 1817 | Washington, Guernsey, and Muskingum Counties | General Daniel Morgan (c. 1735 – 1802), a Revolutionary War officer | 13,532 | 417.66 sq mi (1,082 km$^2$) |
| Morrow County | 117 | Mount Gilead | Mar 1, 1848 | Knox, Marion, Delaware, and Richland Counties | Jeremiah Morrow (1771–1852), Governor of Ohio | 35,927 | 406.22 sq mi (1,052 km$^2$) |
| Muskingum County | 119 | Zanesville | March 1, 1804 | Washington and Fairfield Counties | An Indian word meaning "A town by the river" or "by the river side" | 86,582 | 664.63 sq mi (1,721 km$^2$) |
| Noble County | 121 | Caldwell | Apr 1, 1851 | Monroe, Washington, Morgan, and Guernsey Counties | James Noble, an early settler in the area | 14,269 | 399.00 sq mi (1,033 km$^2$) |
| Ottawa County | 123 | Port Clinton | Mar 6, 1840 | Erie, Sandusky, and Lucas Counties | Named for the Ottawa Indians; Ottawa means "trader" in their language | 39,692 | 254.95 sq mi (660 km$^2$) |
| Paulding County | 125 | Paulding | Apr 1, 1820 | Darke County | John Paulding (1758–1818), captor of spy John André during the Revolutionary War | 18,755 | 416.26 sq mi (1,078 km$^2$) |
| Perry County | 127 | New Lexington | Mar 1, 1818 | Washington, Fairfield, and Muskingum Counties | Commodore Oliver Hazard Perry (1785–1819), a naval officer of the War of 1812 | 35,682 | 409.78 sq mi (1,061 km$^2$) |
| Pickaway County | 129 | Circleville | Mar 1, 1810 | Ross, Fairfield, and Franklin Counties | A misspelling of the Piqua tribe, a branch of the Shawnee | 62,158 | 501.91 sq mi (1,300 km$^2$) |
| Pike County | 131 | Waverly | Feb 1, 1815 | Ross, Scioto, and Adams Counties | General Zebulon M. Pike (1779–1813), a War of 1812 officer and discoverer of Pikes Peak in Colorado in 1806 | 27,065 | 441.49 sq mi (1,143 km$^2$) |
| Portage County | 133 | Ravenna | Jun 7, 1807 | Trumbull County | Derived from an Indian portage | 163,839 | 492.39 sq mi (1,275 km$^2$) |
| Preble County | 135 | Eaton | Mar 1, 1808 | Montgomery and Butler Counties | Captain Edward Preble (1761–1807), a Naval commander in the Revolutionary War | 40,801 | 424.80 sq mi (1,100 km$^2$) |
| Putnam County | 137 | Ottawa | Apr 1, 1820 | Shelby County | General Israel Putnam (1718–1790), a Revolutionary War officer | 34,206 | 483.87 sq mi (1,253 km$^2$) |
| Richland County | 139 | Mansfield | Mar 1, 1808 | Fairfield County | Descriptive of the soil in the area | 124,853 | 496.88 sq mi (1,287 km$^2$) |
| Ross County | 141 | Chillicothe | Aug 20, 1798 | Adams and Washington Counties | Named for U.S. Senator from Pennsylvania James Ross by territorial governor Arthur St. Clair | 76,046 | 688.41 sq mi (1,783 km$^2$) |
| Sandusky County | 143 | Fremont | Apr 1, 1820 | Huron County | An Iroquois word meaning "cold water" | 58,866 | 409.18 sq mi (1,060 km$^2$) |
| Scioto County | 145 | Portsmouth | May 1, 1803 | Adams County | Scioto River; Scioto is a Wyandot Indian word meaning "deer" | 71,798 | 612.27 sq mi (1,586 km$^2$) |
| Seneca County | 147 | Tiffin | Apr 1, 1820 | Huron County | Seneca Indians, who had a reservation in the county area at the time | 54,730 | 550.59 sq mi (1,426 km$^2$) |
| Shelby County | 149 | Sidney | Apr 1, 1819 | Miami County | General Isaac Shelby (1750–1826), a Revolutionary War officer and Governor of Kentucky | 47,952 | 409.27 sq mi (1,060 km$^2$) |
| Stark County | 151 | Canton | Feb 13, 1808 | Columbiana County | General 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 | 374,091 | 576.14 sq mi (1,492 km$^2$) |
| Summit County | 153 | Akron | Mar 3, 1840 | Medina, Portage, and Stark Counties | Its location at the highest elevation along the Ohio and Erie Canal | 538,370 | 419.38 sq mi (1,086 km$^2$) |
| Trumbull County | 155 | Warren | Jul 10, 1800 | Jefferson and Wayne Counties | Jonathan Trumbull (1710–1785), Governor of Connecticut when the county was organized | 200,300 | 616.48 sq mi (1,597 km$^2$) |
| Tuscarawas County | 157 | New Philadelphia | Mar 15, 1808 | Muskingum County | Tuscarawas River, meaning "open mouth river" or the Tuscarawas tribe who lived on the river | 92,048 | 567.58 sq mi (1,470 km$^2$) |
| Union County | 159 | Marysville | Apr 1, 1820 | Delaware, Franklin, Logan, and Madison Counties | Its formation by a union of four counties | 71,721 | 436.65 sq mi (1,131 km$^2$) |
| Van Wert County | 161 | Van Wert | Apr 1, 1820 | Darke County | Isaac Van Wart (1760–1828), captor of spy John André during the Revolutionary War | 28,887 | 410.09 sq mi (1,062 km$^2$) |
| Vinton County | 163 | McArthur | Mar 23, 1850 | Athens, Gallia, Hocking, Jackson, and Ross Counties | Samuel Finley Vinton (1792–1862), Ohio Statesman and U.S. Congressman | 12,545 | 414.08 sq mi (1,072 km$^2$) |
| Warren County | 165 | Lebanon | May 1, 1803 | Hamilton County | General Joseph Warren (1741–1775), a Revolutionary War officer | 256,059 | 399.63 sq mi (1,035 km$^2$) |
| Washington County | 167 | Marietta | Jul 27, 1788 | One of the original counties | George Washington (1732–1799), commander of the Continental Army, president of the Constitutional Convention, and future President of the United States | 58,332 | 635.15 sq mi (1,645 km$^2$) |
| Wayne County | 169 | Wooster | Mar 1, 1812 | Stark County | General Anthony Wayne (1745–1796), a Revolutionary War officer | 116,632 | 555.36 sq mi (1,438 km$^2$) |
| Williams County | 171 | Bryan | Apr 1, 1820 | Darke County | David Williams (1754–1831), captor of spy John André during the Revolutionary War | 36,554 | 421.74 sq mi (1,092 km$^2$) |
| Wood County | 173 | Bowling Green | Apr 1, 1820 | Refactored from non-county territory | Eleazer D. Wood (1783–1814), founder of Fort Meigs | 133,077 | 617.32 sq mi (1,599 km$^2$) |
| Wyandot County | 175 | Upper Sandusky | Feb 3, 1845 | Marion, Crawford, and Hardin Counties | Wyandot Indians | 21,394 | 405.61 sq mi (1,051 km$^2$) |

## 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.
Various state agencies identify counties by different coding schemes. The Ohio Department of Taxation assigns consecutive numbers for the purpose of enumerating taxing districts. The Ohio Department of Public Safety, including the Ohio Bureau of Motor Vehicles, associates these county numbers with vehicle registrations. The Department of Transportation uses three-letter abbreviations in road inventory and traffic management applications. 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.
| County | FIPS code | ODPS/ODT code | OAI code | ODOT/OHI code |
| Adams County | 001 | 01 | AD | ADA |
| Allen County | 003 | 02 | AL | ALL |
| Ashland County | 005 | 03 | AS | ASD |
| Ashtabula County | 007 | 04 | AB | ATB |
| Athens County | 009 | 05 | AT | ATH |
| Auglaize County | 011 | 06 | AU | AUG |
| Belmont County | 013 | 07 | BL | BEL |
| Brown County | 015 | 08 | BR | BRO |
| Butler County | 017 | 09 | BU | BUT |
| Carroll County | 019 | 10 | CA | CAR |
| Champaign County | 021 | 11 | CH | CHP |
| Clark County | 023 | 12 | CL | CLA |
| Clermont County | 025 | 13 | CT | CLE |
| Clinton County | 027 | 14 | CN | CLI |
| Columbiana County | 029 | 15 | CO | COL |
| Coshocton County | 031 | 16 | CS | COS |
| Crawford County | 033 | 17 | CR | CRA |
| Cuyahoga County | 035 | 18 | CU | CUY |
| Darke County | 037 | 19 | DA | DAR |
| Defiance County | 039 | 20 | DE | DEF |
| Delaware County | 041 | 21 | DL | DEL |
| Erie County | 043 | 22 | ER | ERI |
| Fairfield County | 045 | 23 | FA | FAI |
| Fayette County | 047 | 24 | FE | FAY |
| Franklin County | 049 | 25 | FR | FRA |
| Fulton County | 051 | 26 | FU | FUL |
| Gallia County | 053 | 27 | GA | GAL |
| Geauga County | 055 | 28 | GE | GEA |
| Greene County | 057 | 29 | GR | GRE |
| Guernsey County | 059 | 30 | GU | GUE |
| Hamilton County | 061 | 31 | HA | HAM |
| Hancock County | 063 | 32 | HK | HAN |
| Hardin County | 065 | 33 | HR | HAR |
| Harrison County | 067 | 34 | HN | HAS |
| Henry County | 069 | 35 | HY | HEN |
| Highland County | 071 | 36 | HI | HIG |
| Hocking County | 073 | 37 | HO | HOC |
| Holmes County | 075 | 38 | HS | HOL |
| Huron County | 077 | 39 | HU | HUR |
| Jackson County | 079 | 40 | JA | JAC |
| Jefferson County | 081 | 41 | JE | JEF |
| Knox County | 083 | 42 | KN | KNO |
| Lake County | 085 | 43 | LA | LAK |
| Lawrence County | 087 | 44 | LE | LAW |
| Licking County | 089 | 45 | LI | LIC |
| Logan County | 091 | 46 | LO | LOG |
| Lorain County | 093 | 47 | LN | LOR |
| Lucas County | 095 | 48 | LU | LUC |
| Madison County | 097 | 49 | MA | MAD |
| Mahoning County | 099 | 50 | MH | MAH |
| Marion County | 101 | 51 | MN | MAR |
| Medina County | 103 | 52 | ME | MED |
| Meigs County | 105 | 53 | MS | MEG |
| Mercer County | 107 | 54 | MR | MER |
| Miami County | 109 | 55 | MI | MIA |
| Monroe County | 111 | 56 | MO | MOE |
| Montgomery County | 113 | 57 | MY | MOT |
| Morgan County | 115 | 58 | MG | MRG |
| Morrow County | 117 | 59 | MW | MRW |
| Muskingum County | 119 | 60 | MU | MUS |
| Noble County | 121 | 61 | NO | NOB |
| Ottawa County | 123 | 62 | OT | OTT |
| Paulding County | 125 | 63 | PA | PAU |
| Perry County | 127 | 64 | PE | PER |
| Pickaway County | 129 | 65 | PI | PIC |
| Pike County | 131 | 66 | PK | PIK |
| Portage County | 133 | 67 | PO | POR |
| Preble County | 135 | 68 | PR | PRE |
| Putnam County | 137 | 69 | PU | PUT |
| Richland County | 139 | 70 | RI | RIC |
| Ross County | 141 | 71 | RO | ROS |
| Sandusky County | 143 | 72 | SA | SAN |
| Scioto County | 145 | 73 | SC | SCI |
| Seneca County | 147 | 74 | SE | SEN |
| Shelby County | 149 | 75 | SH | SHE |
| Stark County | 151 | 76 | ST | STA |
| Summit County | 153 | 77 | SU | SUM |
| Trumbull County | 155 | 78 | TR | TRU |
| Tuscarawas County | 157 | 79 | TU | TUS |
| Union County | 159 | 80 | UN | UNI |
| Van Wert County | 161 | 81 | VW | VAN |
| Vinton County | 163 | 82 | VI | VIN |
| Warren County | 165 | 83 | WA | WAR |
| Washington County | 167 | 84 | WN | WAS |
| Wayne County | 169 | 85 | WE | WAY |
| Williams County | 171 | 86 | WI | WIL |
| Wood County | 173 | 87 | WO | WOO |
| Wyandot County | 175 | 88 | WY | WYA |