List of counties in Ohio

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Counties of Ohio

There are eighty-eight counties in the U.S. state of Ohio. The elected county officials include three commissioners, a sheriff (the highest law enforcement officer in the county); prosecutor (equivalent of a district attorney in other states); coroner, engineer, auditor, treasurer and clerk of courts.

List of counties[change | change source]

County
FIPS Code
[1]
County Seat
[2]
Created
[2][3]
Origin
[4]
Meaning of name
[3][4]
Population
[1][2]
Area
[2]
Map
 
Adams County 001 West Union July 10, 1797 Hamilton County John Adams (1735-1826), second U.S. President and executive when the county was organized &&&&&&&&&&028550.&&&&&028,550 &&&&&&&&&&&&0583.910000583.91 sq mi
(&&&&&&&&&&&01512.&&&&&01,512 km²)
State map highlighting Adams County
Allen County 003 Lima March 1, 1820 Shelby County John Allen (1771/2-1813), a War of 1812 colonel[5] &&&&&&&&&0106331.&&&&&0106,331 &&&&&&&&&&&&0404.430000404.43 sq mi
(&&&&&&&&&&&01047.&&&&&01,047 km²)
State map highlighting Allen County
Ashland County 005 Ashland February 24, 1846 Wayne, Richland, Huron, and Lorain Counties Ashland, home of U.S. Senator from Kentucky Henry Clay. &&&&&&&&&&053139.&&&&&053,139 &&&&&&&&&&&&0424.370000424.37 sq mi
(&&&&&&&&&&&01099.&&&&&01,099 km²)
State map highlighting Ashland County
Ashtabula County 007 Jefferson June 7, 1807 Trumbull and Geauga Counties Ashtabula River, which means "fish river" in an Algonquian language[6] &&&&&&&&&0101497.&&&&&0101,497 &&&&&&&&&&&&0702.440000702.44 sq mi
(&&&&&&&&&&&01819.&&&&&01,819 km²)
State map highlighting Ashtabula County
Athens County 009 Athens March 1, 1805 Washington County Athens, Greece &&&&&&&&&&064757.&&&&&064,757 &&&&&&&&&&&&0506.760000506.76 sq mi
(&&&&&&&&&&&01313.&&&&&01,313 km²)
State map highlighting Athens County
Auglaize County 011 Wapakoneta February 14, 1848 Allen, Mercer, Darke, Hardin, Logan, Shelby, and Van Wert Counties Auglaize River, which means "fallen timbers river" to the Shawnee &&&&&&&&&&045949.&&&&&045,949 &&&&&&&&&&&&0401.250000401.25 sq mi
(&&&&&&&&&&&01039.&&&&&01,039 km²)
State map highlighting Auglaize County
Belmont County 013 St. Clairsville September 7, 1801 Jefferson and Washington Counties Belle monte, which means "beautiful mountain" in French &&&&&&&&&&070400.&&&&&070,400 &&&&&&&&&&&&0537.350000537.35 sq mi
(&&&&&&&&&&&01392.&&&&&01,392 km²)
State map highlighting Belmont County
Brown County 015 Georgetown March 1, 1818 Adams and Clermont Counties General Jacob Brown (1775-1828), an officer of the War of 1812 &&&&&&&&&&044846.&&&&&044,846 &&&&&&&&&&&&0491.760000491.76 sq mi
(&&&&&&&&&&&01274.&&&&&01,274 km²)
State map highlighting Brown County
Butler County 017 Hamilton May 1, 1803 Hamilton County General Richard Butler (1743-1791), killed at the Battle of the Wabash &&&&&&&&&0368130.&&&&&0368,130 &&&&&&&&&&&&0467.270000467.27 sq mi
(&&&&&&&&&&&01210.&&&&&01,210 km²)
State map highlighting Butler County
Carroll County 019 Carrollton January 1, 1833 Columbiana, Stark, Harrison, Jefferson, and Tuscarawas Counties Charles Carroll (1737-1832), last surviving signer of the United States Declaration of Independence &&&&&&&&&&028836.&&&&&028,836 &&&&&&&&&&&&0394.670000394.67 sq mi
(&&&&&&&&&&&01022.&&&&&01,022 km²)
State map highlighting Carroll County
Champaign County 021 Urbana March 1, 1805 Greene and Franklin Counties French for "a plain", describing the land in the area &&&&&&&&&&040097.&&&&&040,097 &&&&&&&&&&&&0428.560000428.56 sq mi
(&&&&&&&&&&&01110.&&&&&01,110 km²)
State map highlighting Champaign County
Clark County 023 Springfield March 1, 1818 Champaign, Madison, and Greene Counties General George Rogers Clark (1752-1818), defeated the Shawnee Indians in a battle near the Springfield area &&&&&&&&&0138333.&&&&&0138,333 &&&&&&&&&&&&0399.860000399.86 sq mi
(&&&&&&&&&&&01036.&&&&&01,036 km²)
State map highlighting Clark County
Clermont County 025 Batavia December 6, 1800 Hamilton County French for "clear mountain" &&&&&&&&&0197363.&&&&&0197,363 &&&&&&&&&&&&0451.990000451.99 sq mi
(&&&&&&&&&&&01171.&&&&&01,171 km²)
State map highlighting Clermont County
Clinton County 027 Wilmington March 1, 1810 Highland and Warren Counties George Clinton (1739-1812), vice-president when the county was organized &&&&&&&&&&042040.&&&&&042,040 &&&&&&&&&&&&0410.880000410.88 sq mi
(&&&&&&&&&&&01064.&&&&&01,064 km²)
State map highlighting Clinton County
Columbiana County 029 Lisbon May 1, 1803 Jefferson and Washington Counties Derived from the words Christopher Columbus, European explorer of the Americas &&&&&&&&&0107841.&&&&&0107,841 &&&&&&&&&&&&0532.460000532.46 sq mi
(&&&&&&&&&&&01379.&&&&&01,379 km²)
State map highlighting Columbiana County
Coshocton County 031 Coshocton January 31, 1810 Muskingum and Tuscarawas Counties Delaware Indian word meaning "union of waters" &&&&&&&&&&036901.&&&&&036,901 &&&&&&&&&&&&0564.&70000564.07 sq mi
(&&&&&&&&&&&01461.&&&&&01,461 km²)
State map highlighting Coshocton County
Crawford County 033 Bucyrus April 1, 1820 Delaware County Colonel William Crawford (1732-1782), Revolutionary War officer &&&&&&&&&&043784.&&&&&043,784 &&&&&&&&&&&&0402.110000402.11 sq mi
(&&&&&&&&&&&01041.&&&&&01,041 km²)
State map highlighting Crawford County
Cuyahoga County 035 Cleveland June 7, 1807 Geauga County Cuyahoga River, which means "crooked river" in an Iroquoian language[7] &&&&&&&&01280122.&&&&&01,280,122 &&&&&&&&&&&&0458.490000458.49 sq mi
(&&&&&&&&&&&01187.&&&&&01,187 km²)
State map highlighting Cuyahoga County
Darke County 037 Greenville January 3, 1809 Miami County General William Darke (1736-1801), Revolutionary War officer &&&&&&&&&&052959.&&&&&052,959 &&&&&&&&&&&&0599.800000599.80 sq mi
(&&&&&&&&&&&01553.&&&&&01,553 km²)
State map highlighting Darke County
Defiance County 039 Defiance April 7, 1845 Williams, Henry, and Paulding Counties Fort Defiance, built in 1794 by General Anthony Wayne &&&&&&&&&&039037.&&&&&039,037 &&&&&&&&&&&&0411.160000411.16 sq mi
(&&&&&&&&&&&01065.&&&&&01,065 km²)
State map highlighting Defiance County
Delaware County 041 Delaware April 1, 1808 Franklin County Delaware Indians &&&&&&&&&0174214.&&&&&0174,214 &&&&&&&&&&&&0442.410000442.41 sq mi
(&&&&&&&&&&&01146.&&&&&01,146 km²)
State map highlighting Delaware County
Erie County 043 Sandusky March 15, 1838 Huron and Sandusky Counties Erie Indians &&&&&&&&&&077079.&&&&&077,079 &&&&&&&&&&&&0254.880000254.88 sq mi
(&&&&&&&&&&&&0660.&&&&&0660 km²)
State map highlighting Erie County
Fairfield County 045 Lancaster December 9, 1800 Ross and Washington Counties Named for the beauty of its "fair fields" &&&&&&&&&0146159.&&&&&0146,159 &&&&&&&&&&&&0505.110000505.11 sq mi
(&&&&&&&&&&&01308.&&&&&01,308 km²)
State map highlighting Fairfield County
Fayette County 047 Washington Court House March 1, 1810 Ross and Highland Counties Marquis de Lafayette, French military officer and aristocrat who participated in both the American and French revolutions. &&&&&&&&&&029030.&&&&&029,030 &&&&&&&&&&&&0406.580000406.58 sq mi
(&&&&&&&&&&&01053.&&&&&01,053 km²)
State map highlighting Fayette County
Franklin County 049 Columbus April 30, 1803 Ross and Wayne Counties Benjamin Franklin (1706-1791) - Founding Father, author, printer, satirist, political theorist, scientist, inventor and statesman. &&&&&&&&01163414.&&&&&01,163,414 &&&&&&&&&&&&0539.870000539.87 sq mi
(&&&&&&&&&&&01398.&&&&&01,398 km²)
State map highlighting Franklin County
Fulton County 051 Wauseon April 1, 1850 Lucas, Henry, and Williams Counties Robert Fulton (1765–1815), inventor of the steamboat &&&&&&&&&&042698.&&&&&042,698 &&&&&&&&&&&&0406.780000406.78 sq mi
(&&&&&&&&&&&01054.&&&&&01,054 km²)
State map highlighting Fulton County
Gallia County 053 Gallipolis April 30, 1803 Washington and Adams Counties Gaul, the ancient name of France &&&&&&&&&&030934.&&&&&030,934 &&&&&&&&&&&&0468.780000468.78 sq mi
(&&&&&&&&&&&01214.&&&&&01,214 km²)
State map highlighting Gallia County
Geauga County 055 Chardon March 1, 1806 Trumbull County A Native American word meaning "raccoon" &&&&&&&&&&093389.&&&&&093,389 &&&&&&&&&&&&0403.660000403.66 sq mi
(&&&&&&&&&&&01045.&&&&&01,045 km²)
State map highlighting Geauga County
Greene County 057 Xenia May 1, 1803 Hamilton and Ross Counties General Nathanael Greene (1742-1786), Revolutionary War officer &&&&&&&&&0161573.&&&&&0161,573 &&&&&&&&&&&&0414.880000414.88 sq mi
(&&&&&&&&&&&01075.&&&&&01,075 km²)
State map highlighting Greene County
Guernsey County 059 Cambridge March 1, 1810 Belmont and Muskingum Counties Island of Guernsey, from where most of the settlers originated &&&&&&&&&&040087.&&&&&040,087 &&&&&&&&&&&&0521.900000521.90 sq mi
(&&&&&&&&&&&01352.&&&&&01,352 km²)
State map highlighting Guernsey County
Hamilton County 061 Cincinnati January 2, 1790 One of the original counties Alexander Hamilton (1755/7-1804), Secretary of the Treasury when the county was organized &&&&&&&&&0802374.&&&&&0802,374 &&&&&&&&&&&&0407.360000407.36 sq mi
(&&&&&&&&&&&01055.&&&&&01,055 km²)
State map highlighting Hamilton County
Hancock County 063 Findlay April 1, 1820 Logan County John Hancock (1737-1793), president of the Continental Congress &&&&&&&&&&074782.&&&&&074,782 &&&&&&&&&&&&0531.350000531.35 sq mi
(&&&&&&&&&&&01376.&&&&&01,376 km²)
State map highlighting Hancock County
Hardin County 065 Kenton April 1, 1820 Logan County General John Hardin (1753–1792), Revolutionary War officer &&&&&&&&&&032058.&&&&&032,058 &&&&&&&&&&&&0470.290000470.29 sq mi
(&&&&&&&&&&&01218.&&&&&01,218 km²)
State map highlighting Hardin County
Harrison County 067 Cadiz February 1, 1813 Jefferson and Tuscarawas Counties General William Henry Harrison (1773–1841), an officer of the War of 1812 and future U.S. President &&&&&&&&&&015864.&&&&&015,864 &&&&&&&&&&&&0403.530000403.53 sq mi
(&&&&&&&&&&&01045.&&&&&01,045 km²)
State map highlighting Harrison County
Henry County 069 Napoleon April 1, 1820 Shelby County Patrick Henry (1736–1799), Revolutionary War-era legislator, orator, and scholar &&&&&&&&&&028215.&&&&&028,215 &&&&&&&&&&&&0416.500000416.50 sq mi
(&&&&&&&&&&&01079.&&&&&01,079 km²)
State map highlighting Henry County
Highland County 071 Hillsboro May 1, 1805 Ross, Adams, and Clermont Counties Descriptive of the county's terrain &&&&&&&&&&043589.&&&&&043,589 &&&&&&&&&&&&0553.280000553.28 sq mi
(&&&&&&&&&&&01433.&&&&&01,433 km²)
State map highlighting Highland County
Hocking County 073 Logan March 1, 1818 Athens, Ross, and Fairfield Counties Possibly derived from the Delaware Indian word "Hoch-Hoch-ing", meaning "bottle" &&&&&&&&&&029380.&&&&&029,380 &&&&&&&&&&&&0422.750000422.75 sq mi
(&&&&&&&&&&&01095.&&&&&01,095 km²)
State map highlighting Hocking County
Holmes County 075 Millersburg January 20, 1824 Coshocton, Wayne, and Tuscarawas Counties Major Andrew Holmes (d. 1814), a War of 1812 officer &&&&&&&&&&042366.&&&&&042,366 &&&&&&&&&&&&0422.990000422.99 sq mi
(&&&&&&&&&&&01096.&&&&&01,096 km²)
State map highlighting Holmes County
Huron County 077 Norwalk March 7, 1809 Portage and Cuyahoga Counties Huron Indians &&&&&&&&&&059626.&&&&&059,626 &&&&&&&&&&&&0492.690000492.69 sq mi
(&&&&&&&&&&&01276.&&&&&01,276 km²)
State map highlighting Huron County
Jackson County 079 Jackson March 1, 1816 Scioto, Gallia, Athens, and Ross Counties General Andrew Jackson (1767–1845) &&&&&&&&&&033225.&&&&&033,225 &&&&&&&&&&&&0420.280000420.28 sq mi
(&&&&&&&&&&&01089.&&&&&01,089 km²)
State map highlighting Jackson County
Jefferson County 081 Steubenville July 29, 1797 Washington County Thomas Jefferson (1743–1826), Vice President when the county was organized, future U.S. President, and principal author of the Declaration of Independence &&&&&&&&&&069709.&&&&&069,709 &&&&&&&&&&&&0409.610000409.61 sq mi
(&&&&&&&&&&&01061.&&&&&01,061 km²)
State map highlighting Jefferson County
Knox County 083 Mount Vernon March 1, 1808 Fairfield County General Henry Knox, the first Secretary of War &&&&&&&&&&060921.&&&&&060,921 &&&&&&&&&&&&0527.120000527.12 sq mi
(&&&&&&&&&&&01365.&&&&&01,365 km²)
State map highlighting Knox County
Lake County 085 Painesville March 6, 1840 Geauga and Cuyahoga Counties Named as such due to it bordering Lake Erie &&&&&&&&&0230041.&&&&&0230,041 &&&&&&&&&&&&0228.210000228.21 sq mi
(&&&&&&&&&&&&0591.&&&&&0591 km²)
State map highlighting Lake County
Lawrence County 087 Ironton December 21, 1815 Gallia and Scioto Counties Captain James Lawrence (1781–1813), naval hero in the War of 1812 &&&&&&&&&&062450.&&&&&062,450 &&&&&&&&&&&&0454.960000454.96 sq mi
(&&&&&&&&&&&01178.&&&&&01,178 km²)
State map highlighting Lawrence County
Licking County 089 Newark March 1, 1808 Fairfield County Named for the salt licks in the area &&&&&&&&&0166492.&&&&&0166,492 &&&&&&&&&&&&0686.500000686.50 sq mi
(&&&&&&&&&&&01778.&&&&&01,778 km²)
State map highlighting Licking County
Logan County 091 Bellefontaine March 1, 1818 Champaign County General Benjamin Logan (c.1742–1802), who destroyed Shawnee Indian towns in the county &&&&&&&&&&045858.&&&&&045,858 &&&&&&&&&&&&0458.440000458.44 sq mi
(&&&&&&&&&&&01187.&&&&&01,187 km²)
State map highlighting Logan County
Lorain County 093 Elyria December 26, 1822 Huron, Cuyahoga, and Medina Counties Province of Lorraine, France &&&&&&&&&0301356.&&&&&0301,356 &&&&&&&&&&&&0492.500000492.50 sq mi
(&&&&&&&&&&&01276.&&&&&01,276 km²)
State map highlighting Lorain County
Lucas County 095 Toledo June 20, 1835 Wood, Sandusky, and Huron Counties Robert Lucas (1781–1853), Governor of Ohio when the county was created &&&&&&&&&0441815.&&&&&0441,815 &&&&&&&&&&&&0340.460000340.46 sq mi
(&&&&&&&&&&&&0882.&&&&&0882 km²)
State map highlighting Lucas County
Madison County 097 London March 1, 1810 Franklin County James Madison (1751-1836), fourth U.S. President &&&&&&&&&&043435.&&&&&043,435 &&&&&&&&&&&&0465.440000465.44 sq mi
(&&&&&&&&&&&01205.&&&&&01,205 km²)
State map highlighting Madison County
Mahoning County 099 Youngstown March 1, 1846 Columbiana and Trumbull Counties Mahoning River, from a Native American word meaning "at the licks" &&&&&&&&&0238823.&&&&&0238,823 &&&&&&&&&&&&0415.250000415.25 sq mi
(&&&&&&&&&&&01075.&&&&&01,075 km²)
State map highlighting Mahoning County
Marion County 101 Marion April 1, 1820 Delaware County General Francis Marion (1732-1795), lieutenant colonel in the Continental Army and later brigadier general in the American Revolutionary War. &&&&&&&&&&066501.&&&&&066,501 &&&&&&&&&&&&0403.840000403.84 sq mi
(&&&&&&&&&&&01046.&&&&&01,046 km²)
State map highlighting Marion County
Medina County 103 Medina February 18, 1812 Portage County Medina, world-renowned religious site and capital of the Al Madinah Province in western Saudi Arabia &&&&&&&&&0172332.&&&&&0172,332 &&&&&&&&&&&&0421.550000421.55 sq mi
(&&&&&&&&&&&01092.&&&&&01,092 km²)
State map highlighting Medina County
Meigs County 105 Pomeroy April 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 &&&&&&&&&&023770.&&&&&023,770 &&&&&&&&&&&&0429.420000429.42 sq mi
(&&&&&&&&&&&01112.&&&&&01,112 km²)
State map highlighting Meigs County
Mercer County 107 Celina April 1, 1820 Darke County General Hugh Mercer (1726-1777), a Revolutionary War officer &&&&&&&&&&040814.&&&&&040,814 &&&&&&&&&&&&0463.270000463.27 sq mi
(&&&&&&&&&&&01200.&&&&&01,200 km²)
State map highlighting Mercer County
Miami County 109 Troy March 1, 1807 Montgomery County Miami Indians &&&&&&&&&0102506.&&&&&0102,506 &&&&&&&&&&&&0407.&40000407.04 sq mi
(&&&&&&&&&&&01054.&&&&&01,054 km²)
State map highlighting Miami County
Monroe County 111 Woodsfield January 29, 1813 Belmont, Washington, and Guernsey Counties James Monroe (1758-1831), Secretary of State when the county was organized and future U.S. President &&&&&&&&&&014642.&&&&&014,642 &&&&&&&&&&&&0455.540000455.54 sq mi
(&&&&&&&&&&&01180.&&&&&01,180 km²)
State map highlighting Monroe County
Montgomery County 113 Dayton May 1, 1803 Hamilton and Wayne Counties General Richard Montgomery (1738-1775), a Revolutionary War officer &&&&&&&&&0535153.&&&&&0535,153 &&&&&&&&&&&&0461.680000461.68 sq mi
(&&&&&&&&&&&01196.&&&&&01,196 km²)
State map highlighting Montgomery County
Morgan County 115 McConnelsville December 29, 1817 Washington, Guernsey, and Muskingum Counties General Daniel Morgan (c.1735–1802), a Revolutionary War officer &&&&&&&&&&015054.&&&&&015,054 &&&&&&&&&&&&0417.660000417.66 sq mi
(&&&&&&&&&&&01082.&&&&&01,082 km²)
State map highlighting Morgan County
Morrow County 117 Mount Gilead March 1, 1848 Knox, Marion, Delaware, and Richland Counties Jeremiah Morrow (1771–1852), Governor of Ohio &&&&&&&&&&034827.&&&&&034,827 &&&&&&&&&&&&0406.220000406.22 sq mi
(&&&&&&&&&&&01052.&&&&&01,052 km²)
State map highlighting Morrow County
Muskingum County 119 Zanesville March 1, 1803 Washington and Fairfield Counties A Native American word meaning "A town by the river"
or
a Native American word meaning "by the river side"
&&&&&&&&&&086074.&&&&&086,074 &&&&&&&&&&&&0664.630000664.63 sq mi
(&&&&&&&&&&&01721.&&&&&01,721 km²)
State map highlighting Muskingum County
Noble County 121 Caldwell April 1, 1851 Monroe, Washington, Morgan, and Guernsey Counties James Noble (1785–1831), an early settler and future U.S. Senator from Indiana &&&&&&&&&&014645.&&&&&014,645 &&&&&&&&&&&&0399.&&&&&0399.00 sq mi
(&&&&&&&&&&&01033.&&&&&01,033 km²)
State map highlighting Noble County
Ottawa County 123 Port Clinton March 6, 1840 Erie, Sandusky, and Lucas Counties Named for the Ottawa Indians; Ottawa means "trader" in their language &&&&&&&&&&041428.&&&&&041,428 &&&&&&&&&&&&0254.950000254.95 sq mi
(&&&&&&&&&&&&0660.&&&&&0660 km²)
State map highlighting Ottawa County
Paulding County 125 Paulding April 1, 1820 Darke County John Paulding (1758–1818), captor of spy John André during the Revolutionary War &&&&&&&&&&019614.&&&&&019,614 &&&&&&&&&&&&0416.260000416.26 sq mi
(&&&&&&&&&&&01078.&&&&&01,078 km²)
State map highlighting Paulding County
Perry County 127 New Lexington March 1, 1818 Washington, Fairfield, and Muskingum Counties Commodore Oliver Hazard Perry (1785–1819), a naval officer of the War of 1812 &&&&&&&&&&036058.&&&&&036,058 &&&&&&&&&&&&0409.780000409.78 sq mi
(&&&&&&&&&&&01061.&&&&&01,061 km²)
State map highlighting Perry County
Pickaway County 129 Circleville March 1, 1810 Ross, Fairfield, and Franklin Counties A misspelling of the Piqua tribe, a branch of the Shawnee
or
A variant of a Native American word "Piqua"
&&&&&&&&&&055698.&&&&&055,698 &&&&&&&&&&&&0501.910000501.91 sq mi
(&&&&&&&&&&&01300.&&&&&01,300 km²)
State map highlighting Pickaway County
Pike County 131 Waverly February 1, 1815 Ross, Scioto, and Adams Counties General Zebulon M. Pike (1779–1813), a Revolutionary War officer and discoverer of Pikes Peak in Colorado in 1806 &&&&&&&&&&028709.&&&&&028,709 &&&&&&&&&&&&0441.490000441.49 sq mi
(&&&&&&&&&&&01143.&&&&&01,143 km²)
State map highlighting Pike County
Portage County 133 Ravenna June 7, 1807 Trumbull County Derived from an Indian portage &&&&&&&&&0161419.&&&&&0161,419 &&&&&&&&&&&&0492.390000492.39 sq mi
(&&&&&&&&&&&01275.&&&&&01,275 km²)
State map highlighting Portage County
Preble County 135 Eaton March 1, 1808 Montgomery and Butler Counties Captain Edward Preble (1761-1807), a Naval commander in the Revolutionary War &&&&&&&&&&042270.&&&&&042,270 &&&&&&&&&&&&0424.800000424.80 sq mi
(&&&&&&&&&&&01100.&&&&&01,100 km²)
State map highlighting Preble County
Putnam County 137 Ottawa April 1, 1820 Shelby County General Israel Putnam (1718–1790), a Revolutionary War officer &&&&&&&&&&034499.&&&&&034,499 &&&&&&&&&&&&0483.870000483.87 sq mi
(&&&&&&&&&&&01253.&&&&&01,253 km²)
State map highlighting Putnam County
Richland County 139 Mansfield March 1, 1808 Fairfield County Descriptive of the soil in the area &&&&&&&&&0124475.&&&&&0124,475 &&&&&&&&&&&&0496.880000496.88 sq mi
(&&&&&&&&&&&01287.&&&&&01,287 km²)
State map highlighting Richland County
Ross County 141 Chillicothe August 20, 1798 Adams and Washington Counties Named for U.S. Senator from Pennsylvania James Ross by territorial governor Arthur St. Clair &&&&&&&&&&078064.&&&&&078,064 &&&&&&&&&&&&0688.410000688.41 sq mi
(&&&&&&&&&&&01783.&&&&&01,783 km²)
State map highlighting Ross County
Sandusky County 143 Fremont April 1, 1820 Huron County An Iroquois word meaning "cold water" &&&&&&&&&&060944.&&&&&060,944 &&&&&&&&&&&&0409.180000409.18 sq mi
(&&&&&&&&&&&01060.&&&&&01,060 km²)
State map highlighting Sandusky County
Scioto County 145 Portsmouth May 1, 1803 Adams County Scioto River; Scioto is a Wyandot word meaning "deer" &&&&&&&&&&079499.&&&&&079,499 &&&&&&&&&&&&0612.270000612.27 sq mi
(&&&&&&&&&&&01586.&&&&&01,586 km²)
State map highlighting Scioto County
Seneca County 147 Tiffin April 1, 1820 Huron County Seneca Indians, who had a reservation in the county area at the time &&&&&&&&&&056745.&&&&&056,745 &&&&&&&&&&&&0550.590000550.59 sq mi
(&&&&&&&&&&&01426.&&&&&01,426 km²)
State map highlighting Seneca County
Shelby County 149 Sidney April 1, 1819 Miami County General Isaac Shelby (1750–1826), a Revolutionary War officer and Governor of Kentucky, &&&&&&&&&&049423.&&&&&049,423 &&&&&&&&&&&&0409.270000409.27 sq mi
(&&&&&&&&&&&01060.&&&&&01,060 km²)
State map highlighting Shelby County
Stark County 151 Canton February 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 &&&&&&&&&0375586.&&&&&0375,586 &&&&&&&&&&&&0576.140000576.14 sq mi
(&&&&&&&&&&&01492.&&&&&01,492 km²)
State map highlighting Stark County
Summit County 153 Akron March 3, 1840 Medina, Portage, and Stark Counties Derived from having the highest elevation along the Ohio Canal &&&&&&&&&0541781.&&&&&0541,781 &&&&&&&&&&&&0412.720000412.72 sq mi
(&&&&&&&&&&&01069.&&&&&01,069 km²)
State map highlighting Summit County
Trumbull County 155 Warren July 10, 1800 Jefferson and Wayne Counties Jonathan Trumbull (1710-1785), Governor of Connecticut when the county was organized &&&&&&&&&0210312.&&&&&0210,312 &&&&&&&&&&&&0616.480000616.48 sq mi
(&&&&&&&&&&&01597.&&&&&01,597 km²)
State map highlighting Trumbull County
Tuscarawas County 157 New Philadelphia March 15, 1808 Muskingum County Tuscarawas River, meaning "open mouth river"
or
the Tuscarawas tribe who lived on the river
&&&&&&&&&&092582.&&&&&092,582 &&&&&&&&&&&&0567.580000567.58 sq mi
(&&&&&&&&&&&01470.&&&&&01,470 km²)
State map highlighting Tuscarawas County
Union County 159 Marysville April 1, 1820 Delaware, Franklin, Logan, and Madison Counties Named as such due to it formed by a union of four counties &&&&&&&&&&052300.&&&&&052,300 &&&&&&&&&&&&0436.650000436.65 sq mi
(&&&&&&&&&&&01131.&&&&&01,131 km²)
State map highlighting Union County
Van Wert County 161 Van Wert April 1, 1820 Darke County Isaac Van Wart (1760-1828), captor of spy John André during the Revolutionary War &&&&&&&&&&028744.&&&&&028,744 &&&&&&&&&&&&0410.&90000410.09 sq mi
(&&&&&&&&&&&01062.&&&&&01,062 km²)
State map highlighting Van Wert County
Vinton County 163 McArthur March 23, 1850 Athens, Gallia, Hocking, Jackson, and Ross Counties Samuel Finley Vinton (1792-1862), Ohio Statesman and U.S. Congressman &&&&&&&&&&013435.&&&&&013,435 &&&&&&&&&&&&0414.&80000414.08 sq mi
(&&&&&&&&&&&01072.&&&&&01,072 km²)
State map highlighting Vinton County
Warren County 165 Lebanon May 1, 1803 Hamilton County General Joseph Warren (1741-1775), a Revolutionary War officer &&&&&&&&&0212693.&&&&&0212,693 &&&&&&&&&&&&0399.630000399.63 sq mi
(&&&&&&&&&&&01035.&&&&&01,035 km²)
State map highlighting Warren County
Washington County 167 Marietta July 27, 1788 One of the original counties George Washington (1732–1799), commander of the Continental Army, president of the Constitutional Convention, and future U.S. President &&&&&&&&&&061778.&&&&&061,778 &&&&&&&&&&&&0635.150000635.15 sq mi
(&&&&&&&&&&&01645.&&&&&01,645 km²)
State map highlighting Washington County
Wayne County 169 Wooster March 1, 1808 From non-county area General Anthony Wayne (1745–1796), a Revolutionary War officer &&&&&&&&&0114520.&&&&&0114,520 &&&&&&&&&&&&0555.360000555.36 sq mi
(&&&&&&&&&&&01438.&&&&&01,438 km²)
State map highlighting Wayne County
Williams County 171 Bryan April 1, 1820 Darke County David Williams (1754-1831), captor of spy John André during the Revolutionary War &&&&&&&&&&037642.&&&&&037,642 &&&&&&&&&&&&0421.740000421.74 sq mi
(&&&&&&&&&&&01092.&&&&&01,092 km²)
State map highlighting Williams County
Wood County 173 Bowling Green April 1, 1820 Refactored from non-county territory Eleazer D. Wood (1783 -1814), founder of Fort Meigs &&&&&&&&&0125488.&&&&&0125,488 &&&&&&&&&&&&0617.320000617.32 sq mi
(&&&&&&&&&&&01599.&&&&&01,599 km²)
State map highlighting Wood County
Wyandot County 175 Upper Sandusky February 3, 1845 Marion, Crawford, and Hardin Counties Wyandot Indians &&&&&&&&&&022615.&&&&&022,615 &&&&&&&&&&&&0405.610000405.61 sq mi
(&&&&&&&&&&&01051.&&&&&01,051 km²)
State map highlighting Wyandot County

References[change | change source]