RANKING · 2025 ESTIMATES · 88 SHOWN OF 88

Most densely populated, Ohio counties

Ohio counties ranked by residents per square mile (2025). This list covers the 88 counties in Ohio that qualify, ranked against each other statewide.

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RELATEDLargest by population Fastest growing Fastest shrinking Most population gained Most population lost Most sparsely populated

RANKPLACESTATEPOPPOPULATION DENSITYVS –

01Cuyahoga County, OHOH1,232,9252,697–

02Franklin County, OHOH1,361,5362,557–

03Hamilton County, OHOH838,4182,068–

04Summit County, OHOH538,3761,304–

05Lucas County, OHOH423,3471,246–

06Montgomery County, OHOH539,5981,170–

07Lake County, OHOH232,2171,012–

08Butler County, OHOH400,128858–

09Lorain County, OHOH323,219659–

10Stark County, OHOH373,771650–

11Warren County, OHOH257,181641–

12Delaware County, OHOH242,032546–

13Mahoning County, OHOH224,706546–

14Clermont County, OHOH216,977479–

15Medina County, OHOH185,025439–

16Greene County, OHOH174,322421–

17Clark County, OHOH135,340342–

18Fairfield County, OHOH169,752337–

19Portage County, OHOH163,404335–

20Trumbull County, OHOH198,972322–

21Erie County, OHOH73,296292–

22Miami County, OHOH112,634277–

23Licking County, OHOH185,564272–

24Richland County, OHOH124,893252–

25Allen County, OHOH100,881251–

26Geauga County, OHOH95,676239–

27Wood County, OHOH134,176217–

28Wayne County, OHOH116,758210–

29Columbiana County, OHOH99,377187–

30Union County, OHOH73,446170–

31Tuscarawas County, OHOH92,373163–

32Marion County, OHOH65,115161–

33Jefferson County, OHOH63,597156–

34Ottawa County, OHOH39,481155–

35Sandusky County, OHOH58,655144–

36Hancock County, OHOH75,034141–

37Ashtabula County, OHOH96,713138–

38Muskingum County, OHOH87,014131–

39Pickaway County, OHOH62,978126–

40Athens County, OHOH63,197125–

41Ashland County, OHOH52,523124–

42Lawrence County, OHOH55,710123–

43Knox County, OHOH64,002122–

44Belmont County, OHOH64,434121–

45Huron County, OHOH58,250118–

46Shelby County, OHOH48,065118–

47Scioto County, OHOH71,365117–

48Auglaize County, OHOH45,909114–

49Ross County, OHOH76,429111–

50Holmes County, OHOH44,970106–

51Crawford County, OHOH41,896104–

52Clinton County, OHOH42,301103–

53Fulton County, OHOH41,853103–

54Logan County, OHOH46,302101–

55Madison County, OHOH46,985101–

56Seneca County, OHOH54,52299–

57Preble County, OHOH40,66496–

58Defiance County, OHOH38,29293–

59Mercer County, OHOH42,73792–

60Washington County, OHOH58,38992–

61Brown County, OHOH44,39791–

62Champaign County, OHOH38,82090–

63Morrow County, OHOH36,30589–

64Perry County, OHOH35,91888–

65Williams County, OHOH36,54987–

66Darke County, OHOH51,52086–

67Highland County, OHOH43,82379–

68Jackson County, OHOH32,81778–

69Guernsey County, OHOH38,37973–

70Putnam County, OHOH34,38071–

71Van Wert County, OHOH29,01371–

72Fayette County, OHOH28,55270–

73Carroll County, OHOH26,47567–

74Henry County, OHOH27,59866–

75Coshocton County, OHOH37,18866–

76Hocking County, OHOH27,51265–

77Hardin County, OHOH30,07264–

78Gallia County, OHOH29,07262–

79Pike County, OHOH27,06161–

80Wyandot County, OHOH21,56753–

81Meigs County, OHOH21,58750–

82Adams County, OHOH27,86548–

83Paulding County, OHOH18,72745–

84Noble County, OHOH14,27636–

85Harrison County, OHOH14,07035–

86Morgan County, OHOH13,62633–

87Vinton County, OHOH12,64531–

88Monroe County, OHOH12,99429–

SHOWING 1–88 OF 88

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES