First-level division
🇺🇸 Ohio
Subdivisions
Franklin
Population 1,321,414
Cuyahoga
Population 1,264,817
Hamilton
Population 830,639
Summit
Population 540,428
Montgomery
Population 537,309
Lucas
Population 431,279
Butler
Population 390,357
Stark
Population 374,853
Lorain
Population 312,964
Warren
Population 242,337
Lake County
Population 232,603
Mahoning
Population 228,614
Delaware
Population 214,124
Clermont
Population 208,601
Trumbull
Population 201,977
Medina
Population 182,470
Licking
Population 178,519
Greene
Population 167,966
Portage
Population 161,791
Fairfield
Population 158,921
Clark
Population 136,001
Wood
Population 132,248
Richland
Population 124,936
Wayne
Population 116,894
Miami
Population 108,774
Allen
Population 102,206
Columbiana
Population 101,877
Ashtabula
Population 97,574
Geauga
Population 95,397
Tuscarawas
Population 93,263
Muskingum
Population 86,410
Ross
Population 77,093
Erie
Population 75,622
Hancock
Population 74,920
Scioto
Population 74,008
Belmont
Population 66,497
Marion
Population 65,359
Jefferson
Population 65,249
Union
Population 62,784
Knox
Population 62,721
Athens
Population 62,431
Washington
Population 59,711
Sandusky
Population 58,896
Huron
Population 58,565
Pickaway
Population 58,539
Lawrence
Population 58,240
Seneca
Population 55,069
Ashland
Population 52,447
Darke
Population 51,881
Shelby
Population 48,230
Auglaize County
Population 46,442
Logan
Population 46,150
Holmes
Population 44,271
Madison
Population 43,824
Brown
Population 43,676
Highland
Population 43,317
Fulton
Population 42,713
Mercer
Population 42,528
Crawford
Population 42,025
Clinton
Population 42,018
Preble
Population 40,999
Ottawa
Population 40,364
Champaign
Population 38,714
Guernsey
Population 38,438
Defiance
Population 38,286
Williams
Population 37,102
Coshocton
Population 36,612
Perry
Population 35,408
Morrow
Population 34,950
Putnam
Population 34,451
Jackson
Population 32,653
Hardin
Population 30,696
Gallia
Population 29,220
Fayette
Population 28,951
Van Wert
Population 28,744
Hocking
Population 28,050
Henry
Population 27,662
Adams
Population 27,477
Pike
Population 27,088
Carroll
Population 26,721
Meigs
Population 22,210
Wyandot
Population 21,900
Paulding
Population 18,806
Harrison
Population 14,483
Noble
Population 14,115
Morgan
Population 13,802
Monroe
Population 13,385
Vinton
Population 12,800