RANKING · 2010 CENSUS · 88 SHOWN OF 88

Most densely populated, Ohio counties · 2010

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, OHOH1,232,9252,800−8%

02Franklin County, OHOH1,361,5362,185+9%

03Hamilton County, OHOH838,4181,979−5%

04Summit County, OHOH538,3761,312−0%

05Lucas County, OHOH423,3471,301−3%

06Montgomery County, OHOH539,5981,160−4%

07Lake County, OHOH232,2171,003+1%

08Butler County, OHOH400,128789+11%

09Stark County, OHOH373,771653−1%

10Lorain County, OHOH323,219614+6%

11Mahoning County, OHOH224,706580−7%

12Warren County, OHOH257,181530+34%

13Clermont County, OHOH216,977436+11%

14Medina County, OHOH185,025409+14%

15Delaware County, OHOH242,032393+58%

16Greene County, OHOH174,322391+9%

17Clark County, OHOH135,340349−4%

18Trumbull County, OHOH198,972341−7%

19Portage County, OHOH163,404331+6%

20Erie County, OHOH73,296307−3%

21Fairfield County, OHOH169,752290+19%

22Allen County, OHOH100,881264−2%

23Miami County, OHOH112,634252+4%

24Richland County, OHOH124,893251−3%

25Licking County, OHOH185,564244+14%

26Geauga County, OHOH95,676233+3%

27Wayne County, OHOH116,758206+3%

28Wood County, OHOH134,176203+4%

29Columbiana County, OHOH99,377203−4%

30Jefferson County, OHOH63,597171−6%

31Marion County, OHOH65,115165+0%

32Tuscarawas County, OHOH92,373163+2%

33Ottawa County, OHOH39,481163+1%

34Sandusky County, OHOH58,655149−1%

35Ashtabula County, OHOH96,713144−1%

36Hancock County, OHOH75,034141+5%

37Lawrence County, OHOH55,710138+0%

38Belmont County, OHOH64,434132+0%

39Scioto County, OHOH71,365130+0%

40Muskingum County, OHOH87,014130+2%

41Athens County, OHOH63,197129+4%

42Ashland County, OHOH52,523126+1%

43Shelby County, OHOH48,065121+3%

44Union County, OHOH73,446121+28%

45Huron County, OHOH58,250121+0%

46Knox County, OHOH64,002116+12%

47Auglaize County, OHOH45,909114−1%

48Ross County, OHOH76,429113+6%

49Pickaway County, OHOH62,978111+6%

50Crawford County, OHOH41,896109−7%

51Fulton County, OHOH41,853105+1%

52Seneca County, OHOH54,522103−3%

53Clinton County, OHOH42,301103+4%

54Holmes County, OHOH44,970100+9%

55Logan County, OHOH46,302100−0%

56Preble County, OHOH40,664100−0%

57Washington County, OHOH58,38998−2%

58Defiance County, OHOH38,29295−1%

59Champaign County, OHOH38,82093+3%

60Madison County, OHOH46,98593+8%

61Brown County, OHOH44,39792+6%

62Williams County, OHOH36,54989−4%

63Darke County, OHOH51,52089−1%

64Perry County, OHOH35,91888+6%

65Mercer County, OHOH42,73788−0%

66Morrow County, OHOH36,30586+10%

67Jackson County, OHOH32,81779+2%

68Highland County, OHOH43,82379+7%

69Guernsey County, OHOH38,37977−2%

70Carroll County, OHOH26,47573+0%

71Putnam County, OHOH34,38071−1%

72Fayette County, OHOH28,55271+2%

73Van Wert County, OHOH29,01370−3%

74Hocking County, OHOH27,51270+4%

75Hardin County, OHOH30,07268+0%

76Henry County, OHOH27,59868−3%

77Gallia County, OHOH29,07266−0%

78Coshocton County, OHOH37,18865+1%

79Pike County, OHOH27,06165+4%

80Wyandot County, OHOH21,56756−1%

81Meigs County, OHOH21,58755+3%

82Adams County, OHOH27,86549+4%

83Paulding County, OHOH18,72747−3%

84Harrison County, OHOH14,07039+0%

85Noble County, OHOH14,27637+4%

86Morgan County, OHOH13,62636+1%

87Vinton County, OHOH12,64533+5%

88Monroe County, OHOH12,99432−4%

SHOWING 1–88 OF 88

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