RANKING · 2020 CENSUS · 88 SHOWN OF 88

Most densely populated, Ohio counties · 2020

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, OHOH1,232,9252,766−9%

02Franklin County, OHOH1,361,5362,486+24%

03Hamilton County, OHOH838,4182,049−2%

04Summit County, OHOH538,3761,309−0%

05Lucas County, OHOH423,3471,270−5%

06Montgomery County, OHOH539,5981,165−4%

07Lake County, OHOH232,2171,014+2%

08Butler County, OHOH400,128837+17%

09Stark County, OHOH373,771652−1%

10Lorain County, OHOH323,219638+10%

11Warren County, OHOH257,181604+53%

12Mahoning County, OHOH224,706556−11%

13Delaware County, OHOH242,032483+95%

14Clermont County, OHOH216,977461+17%

15Medina County, OHOH185,025433+21%

16Greene County, OHOH174,322406+14%

17Clark County, OHOH135,340344−6%

18Portage County, OHOH163,404332+6%

19Trumbull County, OHOH198,972327−10%

20Fairfield County, OHOH169,752315+29%

21Erie County, OHOH73,296301−5%

22Miami County, OHOH112,634268+10%

23Licking County, OHOH185,564262+23%

24Allen County, OHOH100,881254−6%

25Richland County, OHOH124,893252−3%

26Geauga County, OHOH95,676238+5%

27Wood County, OHOH134,176214+9%

28Wayne County, OHOH116,758211+5%

29Columbiana County, OHOH99,377192−9%

30Tuscarawas County, OHOH92,373164+3%

31Marion County, OHOH65,115162−1%

32Jefferson County, OHOH63,597160−12%

33Ottawa County, OHOH39,481158−2%

34Union County, OHOH73,446145+53%

35Sandusky County, OHOH58,655144−5%

36Hancock County, OHOH75,034141+5%

37Ashtabula County, OHOH96,713139−5%

38Muskingum County, OHOH87,014130+2%

39Lawrence County, OHOH55,710128−7%

40Belmont County, OHOH64,434125−5%

41Ashland County, OHOH52,523124−0%

42Athens County, OHOH63,197124+0%

43Scioto County, OHOH71,365121−7%

44Knox County, OHOH64,002119+15%

45Huron County, OHOH58,250119−2%

46Shelby County, OHOH48,065118+1%

47Pickaway County, OHOH62,978117+11%

48Auglaize County, OHOH45,909116−0%

49Ross County, OHOH76,429112+5%

50Fulton County, OHOH41,853105+1%

51Holmes County, OHOH44,970105+14%

52Crawford County, OHOH41,896105−11%

53Clinton County, OHOH42,301103+4%

54Logan County, OHOH46,302101+0%

55Seneca County, OHOH54,522100−6%

56Preble County, OHOH40,66497−3%

57Washington County, OHOH58,38995−6%

58Madison County, OHOH46,98594+9%

59Defiance County, OHOH38,29293−3%

60Mercer County, OHOH42,73792+4%

61Champaign County, OHOH38,82090−0%

62Brown County, OHOH44,39789+3%

63Williams County, OHOH36,54988−5%

64Perry County, OHOH35,91887+4%

65Darke County, OHOH51,52087−3%

66Morrow County, OHOH36,30586+11%

67Highland County, OHOH43,82378+6%

68Jackson County, OHOH32,81778+0%

69Guernsey County, OHOH38,37974−6%

70Putnam County, OHOH34,38071−1%

71Fayette County, OHOH28,55271+2%

72Van Wert County, OHOH29,01371−2%

73Carroll County, OHOH26,47568−7%

74Hocking County, OHOH27,51267−1%

75Henry County, OHOH27,59866−5%

76Hardin County, OHOH30,07265−4%

77Coshocton County, OHOH37,18865−0%

78Gallia County, OHOH29,07263−6%

79Pike County, OHOH27,06162−2%

80Wyandot County, OHOH21,56754−4%

81Meigs County, OHOH21,58752−4%

82Adams County, OHOH27,86547+1%

83Paulding County, OHOH18,72745−7%

84Harrison County, OHOH14,07036−9%

85Noble County, OHOH14,27635+0%

86Morgan County, OHOH13,62633−7%

87Vinton County, OHOH12,64531−0%

88Monroe County, OHOH12,99429−12%

SHOWING 1–88 OF 88

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