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| County | FIPS Code | County Seat | Established in | Population | Area (sq mi) | Area (km2) |
|---|---|---|---|---|---|---|
| Adams County | 1 | West Union | Jul 10, 1797 | 28,550 | 583.91 | 1,512 |
| Allen County | 3 | Lima | Mar 1, 1820 | 106,331 | 404.43 | 1,047 |
| Ashland County | 5 | Ashland | Feb 24, 1846 | 53,139 | 424.37 | 1,099 |
| Ashtabula County | 7 | Jefferson | Jun 7, 1807 | 101,497 | 702.44 | 1,819 |
| Athens County | 9 | Athens | Mar 1, 1805 | 64,757 | 506.76 | 1,313 |
| Auglaize County | 11 | Wapakoneta | Feb 14, 1848 | 45,949 | 401.25 | 1,039 |
| Belmont County | 13 | St. Clairsville | Sep 7, 1801 | 70,400 | 537.35 | 1,392 |
| Brown County | 15 | Georgetown | Mar 1, 1818 | 44,846 | 491.76 | 1,274 |
| Butler County | 17 | Hamilton | May 1, 1803 | 368,130 | 467.27 | 1,210 |
| Carroll County | 19 | Carrollton | Jan 1, 1833 | 28,836 | 394.67 | 1,022 |
| Champaign County | 21 | Urbana | Mar 1, 1805 | 40,097 | 428.56 | 1,110 |
| Clark County | 23 | Springfield | Mar 1, 1818 | 138,333 | 399.86 | 1,036 |
| Clermont County | 25 | Batavia | Dec 6, 1800 | 197,363 | 451.99 | 1,171 |
| Clinton County | 27 | Wilmington | Mar 1, 1810 | 42,040 | 410.88 | 1,064 |
| Columbiana County | 29 | Lisbon | May 1, 1803 | 107,841 | 532.46 | 1,379 |
| Coshocton County | 31 | Coshocton | Jan 31, 1810 | 36,901 | 564.07 | 1,461 |
| Crawford County | 33 | Bucyrus | Apr 1, 1820 | 43,784 | 402.11 | 1,041 |
| Cuyahoga County | 35 | Cleveland | Jun 7, 1807 | 1,249,352 | 458.49 | 1,187 |
| Darke County | 37 | Greenville | Jan 3, 1809 | 52,959 | 599.8 | 1,553 |
| Defiance County | 39 | Defiance | Apr 7, 1845 | 39,037 | 411.16 | 1,065 |
| Delaware County | 41 | Delaware | Apr 1, 1808 | 174,214 | 442.41 | 1,146 |
| Erie County | 43 | Sandusky | Mar 15, 1838 | 77,079 | 254.88 | 660 |
| Fairfield County | 45 | Lancaster | Dec 9, 1800 | 146,156 | 505.11 | 1,308 |
| Fayette County | 47 | Washington Court House | Mar 1, 1810 | 29,030 | 406.58 | 1,053 |
| Franklin County | 49 | Columbus | Apr 30, 1803 | 1,264,518 | 539.87 | 1,398 |
| Fulton County | 51 | Wauseon | Apr 1, 1850 | 42,698 | 406.78 | 1,054 |
| Gallia County | 53 | Gallipolis | Apr 30, 1803 | 30,934 | 468.78 | 1,214 |
| Geauga County | 55 | Chardon | Mar 1, 1806 | 93,389 | 403.66 | 1,045 |
| Greene County | 57 | Xenia | May 1, 1803 | 161,573 | 414.88 | 1,075 |
| Guernsey County | 59 | Cambridge | Mar 1, 1810 | 40,087 | 521.9 | 1,352 |
| Hamilton County | 61 | Cincinnati | Jan 2, 1790 | 802,374 | 407.36 | 1,055 |
| Hancock County | 63 | Findlay | Apr 1, 1820 | 74,782 | 531.35 | 1,376 |
| Hardin County | 65 | Kenton | Apr 1, 1820 | 32,058 | 470.29 | 1,218 |
| Harrison County | 67 | Cadiz | Feb 1, 1813 | 15,864 | 403.53 | 1,045 |
| Henry County | 69 | Napoleon | Apr 1, 1820 | 28,215 | 416.5 | 1,079 |
| Highland County | 71 | Hillsboro | May 1, 1805 | 43,589 | 553.28 | 1,433 |
| Hocking County | 73 | Logan | Mar 1, 1818 | 29,380 | 422.75 | 1,095 |
| Holmes County | 75 | Millersburg | Jan 20, 1824 | 42,366 | 422.99 | 1,096 |
| Huron County | 77 | Norwalk | Mar 7, 1809 | 59,626 | 492.69 | 1,276 |
| Jackson County | 79 | Jackson | Mar 1, 1816 | 33,225 | 420.28 | 1,089 |
| Jefferson County | 81 | Steubenville | Jul 29, 1797 | 69,709 | 409.61 | 1,061 |
| Knox County | 83 | Mount Vernon | Mar 1, 1808 | 60,921 | 527.12 | 1,365 |
| Lake County | 85 | Painesville | Mar 6, 1840 | 230,041 | 228.21 | 591 |
| Lawrence County | 87 | Ironton | Dec 21, 1815 | 62,450 | 454.96 | 1,178 |
| Licking County | 89 | Newark | Mar 1, 1808 | 166,492 | 686.5 | 1,778 |
| Logan County | 91 | Bellefontaine | Mar 1, 1818 | 45,858 | 458.44 | 1,187 |
| Lorain County | 93 | Elyria | Dec 26, 1822 | 301,356 | 492.5 | 1,276 |
| Lucas County | 95 | Toledo | Jun 20, 1835 | 441,815 | 340.46 | 882 |
| Madison County | 97 | London | Mar 1, 1810 | 43,435 | 465.44 | 1,205 |
| Mahoning County | 99 | Youngstown | Mar 1, 1846 | 238,823 | 415.25 | 1,075 |
| Marion County | 101 | Marion | Apr 1, 1820 | 66,501 | 403.84 | 1,046 |
| Medina County | 103 | Medina | Feb 18, 1812 | 176,395 | 423 | 1,096 |
| Meigs County | 105 | Pomeroy | Apr 1, 1819 | 23,770 | 429.42 | 1,112 |
| Mercer County | 107 | Celina | Apr 1, 1820 | 40,814 | 463.27 | 1,200 |
| Miami County | 109 | Troy | Mar 1, 1807 | 102,506 | 407.04 | 1,054 |
| Monroe County | 111 | Woodsfield | Jan 29, 1813 | 14,642 | 455.54 | 1,180 |
| Montgomery County | 113 | Dayton | May 1, 1803 | 535,153 | 461.68 | 1,196 |
| Morgan County | 115 | McConnelsville | Dec 29, 1817 | 15,054 | 417.66 | 1,082 |
| Morrow County | 117 | Mount Gilead | Mar 1, 1848 | 34,827 | 406.22 | 1,052 |
| Muskingum County | 119 | Zanesville | Mar 1, 1804 | 86,074 | 664.63 | 1,721 |
| Noble County | 121 | Caldwell | Apr 1, 1851 | 14,645 | 399 | 1,033 |
| Ottawa County | 123 | Port Clinton | Mar 6, 1840 | 41,428 | 254.95 | 660 |
| Paulding County | 125 | Paulding | Apr 1, 1820 | 19,614 | 416.26 | 1,078 |
| Perry County | 127 | New Lexington | Mar 1, 1818 | 36,058 | 409.78 | 1,061 |
| Pickaway County | 129 | Circleville | Mar 1, 1810 | 55,698 | 501.91 | 1,300 |
| Pike County | 131 | Waverly | Feb 1, 1815 | 28,709 | 441.49 | 1,143 |
| Portage County | 133 | Ravenna | Jun 7, 1807 | 161,419 | 492.39 | 1,275 |
| Preble County | 135 | Eaton | Mar 1, 1808 | 42,270 | 424.8 | 1,100 |
| Putnam County | 137 | Ottawa | Apr 1, 1820 | 34,499 | 483.87 | 1,253 |
| Richland County | 139 | Mansfield | Mar 1, 1808 | 124,475 | 496.88 | 1,287 |
| Ross County | 141 | Chillicothe | Aug 20, 1798 | 78,064 | 688.41 | 1,783 |
| Sandusky County | 143 | Fremont | Apr 1, 1820 | 60,944 | 409.18 | 1,060 |
| Scioto County | 145 | Portsmouth | May 1, 1803 | 79,499 | 612.27 | 1,586 |
| Seneca County | 147 | Tiffin | Apr 1, 1820 | 56,745 | 550.59 | 1,426 |
| Shelby County | 149 | Sidney | Apr 1, 1819 | 49,423 | 409.27 | 1,060 |
| Stark County | 151 | Canton | Feb 13, 1808 | 375,586 | 576.14 | 1,492 |
| Summit County | 153 | Akron | Mar 3, 1840 | 541,781 | 419.38 | 1,086 |
| Trumbull County | 155 | Warren | Jul 10, 1800 | 210,312 | 616.48 | 1,597 |
| Tuscarawas County | 157 | New Philadelphia | Mar 15, 1808 | 92,582 | 567.58 | 1,470 |
| Union County | 159 | Marysville | Apr 1, 1820 | 52,300 | 436.65 | 1,131 |
| Van Wert County | 161 | Van Wert | Apr 1, 1820 | 28,744 | 410.09 | 1,062 |
| Vinton County | 163 | McArthur | Mar 23, 1850 | 13,435 | 414.08 | 1,072 |
| Warren County | 165 | Lebanon | May 1, 1803 | 212,693 | 399.63 | 1,035 |
| Washington County | 167 | Marietta | Jul 27, 1788 | 61,778 | 635.15 | 1,645 |
| Wayne County | 169 | Wooster | Mar 1, 1808 | 114,520 | 555.36 | 1,438 |
| Williams County | 171 | Bryan | Apr 1, 1820 | 37,642 | 421.74 | 1,092 |
| Wood County | 173 | Bowling Green | Apr 1, 1820 | 125,488 | 617.32 | 1,599 |
| Wyandot County | 175 | Upper Sandusky | Feb 3, 1845 | 22,615 | 405.61 | 1,051 |