RANKING · 1990 CENSUS · 88 SHOWN OF 88

Most densely populated, Ohio counties · 1990

Ohio counties ranked by residents per square mile (2023). This list covers the 88 counties in Ohio that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most sparsely populated Best broadband access Worst broadband access

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Cuyahoga County, OHOH1,232,9253,089+1%

02Hamilton County, OHOH838,4182,136+2%

03Franklin County, OHOH1,361,5361,806−10%

04Lucas County, OHOH423,3471,361+2%

05Summit County, OHOH538,3761,248−5%

06Montgomery County, OHOH539,5981,244+3%

07Lake County, OHOH232,217939−5%

08Mahoning County, OHOH224,706644+3%

09Stark County, OHOH373,771639−3%

10Butler County, OHOH400,128625−12%

11Lorain County, OHOH323,219553−5%

12Clark County, OHOH135,340373+2%

13Trumbull County, OHOH198,972369+1%

14Clermont County, OHOH216,977332−16%

15Greene County, OHOH174,322331−8%

16Erie County, OHOH73,296306−3%

17Portage County, OHOH163,404293−6%

18Medina County, OHOH185,025290−19%

19Warren County, OHOH257,181284−28%

20Allen County, OHOH100,881273+1%

21Richland County, OHOH124,893255−2%

22Miami County, OHOH112,634229−6%

23Fairfield County, OHOH169,752205−16%

24Columbiana County, OHOH99,377204−3%

25Geauga County, OHOH95,676203−11%

26Jefferson County, OHOH63,597197+9%

27Licking County, OHOH185,564188−12%

28Wood County, OHOH134,176184−6%

29Wayne County, OHOH116,758183−9%

30Marion County, OHOH65,115159−3%

31Ottawa County, OHOH39,481157−2%

32Sandusky County, OHOH58,655152+0%

33Delaware County, OHOH242,032151−39%

34Tuscarawas County, OHOH92,373148−8%

35Ashtabula County, OHOH96,713142−3%

36Lawrence County, OHOH55,710136−1%

37Belmont County, OHOH64,434134+1%

38Scioto County, OHOH71,365132+1%

39Muskingum County, OHOH87,014123−3%

40Hancock County, OHOH75,034123−8%

41Crawford County, OHOH41,896119+2%

42Athens County, OHOH63,197118−4%

43Huron County, OHOH58,250114−5%

44Ashland County, OHOH52,523112−10%

45Auglaize County, OHOH45,909111−4%

46Shelby County, OHOH48,065110−6%

47Seneca County, OHOH54,522108+2%

48Ross County, OHOH76,429101−5%

49Washington County, OHOH58,38999−2%

50Pickaway County, OHOH62,97896−8%

51Defiance County, OHOH38,29296−0%

52Fulton County, OHOH41,85395−9%

53Preble County, OHOH40,66495−5%

54Logan County, OHOH46,30292−8%

55Knox County, OHOH64,00290−13%

56Darke County, OHOH51,52090+1%

57Williams County, OHOH36,54988−6%

58Clinton County, OHOH42,30187−13%

59Mercer County, OHOH42,73785−4%

60Champaign County, OHOH38,82084−7%

61Madison County, OHOH46,98579−8%

62Holmes County, OHOH44,97078−16%

63Perry County, OHOH35,91877−7%

64Guernsey County, OHOH38,37975−4%

65Van Wert County, OHOH29,01374+3%

66Union County, OHOH73,44674−22%

67Jackson County, OHOH32,81772−7%

68Brown County, OHOH44,39771−17%

69Putnam County, OHOH34,38070−3%

70Henry County, OHOH27,59870−0%

71Morrow County, OHOH36,30568−12%

72Fayette County, OHOH28,55268−3%

73Carroll County, OHOH26,47567−8%

74Gallia County, OHOH29,07266−0%

75Hardin County, OHOH30,07266−3%

76Highland County, OHOH43,82365−13%

77Coshocton County, OHOH37,18863−3%

78Hocking County, OHOH27,51261−10%

79Pike County, OHOH27,06155−12%

80Wyandot County, OHOH21,56755−3%

81Meigs County, OHOH21,58753−0%

82Paulding County, OHOH18,72749+1%

83Adams County, OHOH27,86543−7%

84Harrison County, OHOH14,07040+1%

85Morgan County, OHOH13,62634−5%

86Monroe County, OHOH12,99434+2%

87Noble County, OHOH14,27628−19%

88Vinton County, OHOH12,64527−13%

SHOWING 1–88 OF 88

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES