Rank County Population (2012)
1 Cuyahoga County, Ohio 1,265,111
2 Franklin County, Ohio 1,195,537
3 Hamilton County, Ohio 802,038
4 Summit County, Ohio 540,811
5 Montgomery County, Ohio 534,325
6 Lucas County, Ohio 437,998
7 Stark County, Ohio 374,868
8 Butler County, Ohio 370,589
9 Lorain County, Ohio 301,478
10 Mahoning County, Ohio 235,145
11 Lake County, Ohio 229,582
12 Warren County, Ohio 217,241
13 Trumbull County, Ohio 207,406
14 Clermont County, Ohio 199,085
15 Delaware County, Ohio 181,061
16 Medina County, Ohio 173,684
17 Licking County, Ohio 167,537
18 Greene County, Ohio 163,587
19 Portage County, Ohio 161,451
20 Fairfield County, Ohio 147,474
21 Clark County, Ohio 137,206
22 Wood County, Ohio 128,200
23 Richland County, Ohio 122,673
24 Wayne County, Ohio 114,848
25 Columbiana County, Ohio 106,507
26 Allen County, Ohio 105,141
27 Miami County, Ohio 103,060
28 Ashtabula County, Ohio 100,389
29 Geauga County, Ohio 93,680
30 Tuscarawas County, Ohio 92,392
31 Muskingum County, Ohio 85,950
32 Scioto County, Ohio 78,477
33 Ross County, Ohio 77,429
34 Erie County, Ohio 76,398
35 Hancock County, Ohio 75,671
36 Belmont County, Ohio 69,671
37 Jefferson County, Ohio 68,389
38 Marion County, Ohio 66,238
39 Athens County, Ohio 64,304
40 Lawrence County, Ohio 62,109
41 Washington County, Ohio 61,475
42 Knox County, Ohio 60,705
43 Sandusky County, Ohio 60,510
44 Huron County, Ohio 59,280
45 Pickaway County, Ohio 56,399
46 Seneca County, Ohio 56,018
47 Ashland County, Ohio 52,962
48 Union County, Ohio 52,715
49 Darke County, Ohio 52,507
50 Shelby County, Ohio 49,167
51 Auglaize County, Ohio 45,831
52 Logan County, Ohio 45,474
53 Brown County, Ohio 44,381
54 Madison County, Ohio 43,053
55 Holmes County, Ohio 43,025
56 Highland County, Ohio 42,998
57 Crawford County, Ohio 42,849
58 Fulton County, Ohio 42,513
59 Clinton County, Ohio 41,886
60 Preble County, Ohio 41,886
61 Ottawa County, Ohio 41,339
62 Mercer County, Ohio 40,875
63 Guernsey County, Ohio 39,817
64 Champaign County, Ohio 39,565
65 Defiance County, Ohio 38,677
66 Williams County, Ohio 37,513
67 Coshocton County, Ohio 36,779
68 Perry County, Ohio 36,015
69 Morrow County, Ohio 34,938
70 Putnam County, Ohio 34,198
71 Jackson County, Ohio 32,954
72 Hardin County, Ohio 31,627
73 Gallia County, Ohio 30,708
74 Hocking County, Ohio 29,273
75 Fayette County, Ohio 28,880
76 Van Wert County, Ohio 28,744
77 Carroll County, Ohio 28,587
78 Pike County, Ohio 28,480
79 Adams County, Ohio 28,350
80 Henry County, Ohio 28,045
81 Meigs County, Ohio 23,593
82 Wyandot County, Ohio 22,607
83 Paulding County, Ohio 19,295
84 Harrison County, Ohio 15,714
85 Morgan County, Ohio 14,911
86 Noble County, Ohio 14,579
87 Monroe County, Ohio 14,549
88 Vinton County, Ohio 13,239

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