Largest Counties in Ohio

Rank County Population County Seat Established Area (km2) Density
1 Franklin County 1,264,507 Columbus 1803 1,398 904.51
2 Cuyahoga County 1,249,341 Cleveland 1807 1,187 1,052.52
3 Hamilton County 802,363 Cincinnati 1790 1,055 760.53
4 Summit County 541,770 Akron 1840 1,086 498.87
5 Montgomery County 535,142 Dayton 1803 1,196 447.44
6 Lucas County 441,804 Toledo 1835 882 500.91
7 Stark County 375,575 Canton 1808 1,492 251.73
8 Butler County 368,119 Hamilton 1803 1,210 304.23
9 Lorain County 301,345 Elyria 1822 1,276 236.16
10 Mahoning County 238,812 Youngstown 1846 1,075 222.15
11 Lake County 230,030 Painesville 1840 591 389.22
12 Warren County 212,682 Lebanon 1803 1,035 205.49
13 Trumbull County 210,301 Warren 1800 1,597 131.69
14 Clermont County 197,352 Batavia 1800 1,171 168.53
15 Medina County 176,384 Medina 1812 1,096 160.93
16 Delaware County 174,203 Delaware 1808 1,146 152.01
17 Licking County 166,481 Newark 1808 1,778 93.63
18 Greene County 161,562 Xenia 1803 1,075 150.29
19 Portage County 161,408 Ravenna 1807 1,275 126.59
20 Fairfield County 146,145 Lancaster 1800 1,308 111.73
21 Clark County 138,322 Springfield 1818 1,036 133.52
22 Wood County 125,477 Bowling Green 1820 1,599 78.47
23 Richland County 124,464 Mansfield 1808 1,287 96.71
24 Wayne County 114,509 Wooster 1808 1,438 79.63
25 Columbiana County 107,830 Lisbon 1803 1,379 78.19
26 Allen County 106,320 Lima 1820 1,047 101.55
27 Miami County 102,495 Troy 1807 1,054 97.24
28 Ashtabula County 101,486 Jefferson 1807 1,819 55.79
29 Geauga County 93,378 Chardon 1806 1,045 89.36
30 Tuscarawas County 92,571 New Philadelphia 1808 1,470 62.97
31 Muskingum County 86,063 Zanesville 1804 1,721 50.01
32 Scioto County 79,488 Portsmouth 1803 1,586 50.12
33 Ross County 78,053 Chillicothe 1798 1,783 43.78
34 Erie County 77,068 Sandusky 1838 660 116.77
35 Hancock County 74,771 Findlay 1820 1,376 54.34
36 Belmont County 70,389 Saint Clairsville 1801 1,392 50.57
37 Jefferson County 69,698 Steubenville 1797 1,061 65.69
38 Marion County 66,490 Marion 1820 1,046 63.57
39 Athens County 64,746 Athens 1805 1,313 49.31
40 Lawrence County 62,439 Ironton 1815 1,178 53
41 Washington County 61,767 Marietta 1788 1,645 37.55
42 Sandusky County 60,933 Fremont 1820 1,060 57.48
43 Knox County 60,910 Mount Vernon 1808 1,365 44.62
44 Huron County 59,615 Norwalk 1809 1,276 46.72
45 Seneca County 56,734 Tiffin 1820 1,426 39.79
46 Pickaway County 55,687 Circleville 1810 1,300 42.84
47 Ashland County 53,128 Ashland 1846 1,099 48.34
48 Darke County 52,948 Greenville 1809 1,553 34.09
49 Union County 52,289 Marysville 1820 1,131 46.23
50 Shelby County 49,412 Sidney 1819 1,060 46.62
51 Auglaize County 45,938 Wapakoneta 1848 1,039 44.21
52 Logan County 45,847 Bellefontaine 1818 1,187 38.62
53 Brown County 44,835 Georgetown 1818 1,274 35.19
54 Crawford County 43,773 Bucyrus 1820 1,041 42.05
55 Highland County 43,578 Hillsboro 1805 1,433 30.41
56 Madison County 43,424 London 1810 1,205 36.04
57 Fulton County 42,687 Wauseon 1850 1,054 40.5
58 Holmes County 42,355 Millersburg 1824 1,096 38.65
59 Preble County 42,259 Eaton 1808 1,100 38.42
60 Clinton County 42,029 Wilmington 1810 1,064 39.5
61 Ottawa County 41,417 Port Clinton 1840 660 62.75
62 Mercer County 40,803 Celina 1820 1,200 34
63 Champaign County 40,086 Urbana 1805 1,110 36.11
64 Guernsey County 40,076 Cambridge 1810 1,352 29.64
65 Defiance County 39,026 Defiance 1845 1,065 36.64
66 Williams County 37,631 Bryan 1820 1,092 34.46
67 Coshocton County 36,890 Coshocton 1810 1,461 25.25
68 Perry County 36,047 New Lexington 1818 1,061 33.97
69 Morrow County 34,816 Mount Gilead 1848 1,052 33.1
70 Putnam County 34,488 Ottawa 1820 1,253 27.52
71 Jackson County 33,214 Jackson 1816 1,089 30.5
72 Hardin County 32,047 Kenton 1820 1,218 26.31
73 Gallia County 30,923 Gallipolis 1803 1,214 25.47
74 Hocking County 29,369 Logan 1818 1,095 26.82
75 Fayette County 29,019 Washington Court House 1810 1,053 27.56
76 Carroll County 28,825 Carrollton 1833 1,022 28.2
77 Van Wert County 28,733 Van Wert 1820 1,062 27.06
78 Pike County 28,698 Waverly 1815 1,143 25.11
79 Adams County 28,539 West Union 1797 1,512 18.88
80 Henry County 28,204 Napoleon 1820 1,079 26.14
81 Meigs County 23,759 Pomeroy 1819 1,112 21.37
82 Wyandot County 22,604 Upper Sandusky 1845 1,051 21.51
83 Paulding County 19,603 Paulding 1820 1,078 18.18
84 Harrison County 15,853 Cadiz 1813 1,045 15.17
85 Morgan County 15,043 McConnelsville 1817 1,082 13.9
86 Noble County 14,634 Caldwell 1851 1,033 14.17
87 Monroe County 14,631 Woodsfield 1813 1,180 12.4
88 Vinton County 13,424 McArthur 1850 1,072 12.52

Largest Counties in Ohio

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