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. The median across all 88 is 121. Biggest climber in the top 100 since 2020: Pickaway County, OH, up 8 places to #39.

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SAME RANKING BYCities States Metros

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

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Cuyahoga County, OHOH1,232,9252,697−12%

02Franklin County, OHOH1,361,5362,557+27%

03Hamilton County, OHOH838,4182,068−1%

04Summit County, OHOH538,3761,304−1%

05Lucas County, OHOH423,3471,246−7%

06Montgomery County, OHOH539,5981,170−3%

07Lake County, OHOH232,2171,012+2%

08Butler County, OHOH400,128858+20%

09▲1Lorain County, OHOH323,219659+14%

10▼1Stark County, OHOH373,771650−1%

11Warren County, OHOH257,181641+62%

12▲1Delaware County, OHOH242,032546+120%

13▼1Mahoning County, OHOH224,706546−13%

14Clermont County, OHOH216,977479+22%

15Medina County, OHOH185,025439+22%

16Greene County, OHOH174,322421+18%

17Clark County, OHOH135,340342−6%

18▲2Fairfield County, OHOH169,752337+38%

19▼1Portage County, OHOH163,404335+7%

20▼1Trumbull County, OHOH198,972322−12%

21Erie County, OHOH73,296292−8%

22Miami County, OHOH112,634277+14%

23Licking County, OHOH185,564272+28%

24▲1Richland County, OHOH124,893252−3%

25▼1Allen County, OHOH100,881251−7%

26Geauga County, OHOH95,676239+5%

27Wood County, OHOH134,176217+11%

28Wayne County, OHOH116,758210+5%

29Columbiana County, OHOH99,377187−11%

30▲4Union County, OHOH73,446170+80%

31▼1Tuscarawas County, OHOH92,373163+2%

32▼1Marion County, OHOH65,115161−2%

33▼1Jefferson County, OHOH63,597156−14%

34▼1Ottawa County, OHOH39,481155−4%

35Sandusky County, OHOH58,655144−5%

36Hancock County, OHOH75,034141+5%

37Ashtabula County, OHOH96,713138−6%

38Muskingum County, OHOH87,014131+3%

39▲8Pickaway County, OHOH62,978126+19%

40▲2Athens County, OHOH63,197125+2%

41Ashland County, OHOH52,5231240%

42▼3Lawrence County, OHOH55,710123−11%

43▲1Knox County, OHOH64,002122+17%

44▼4Belmont County, OHOH64,434121−8%

45Huron County, OHOH58,250118−2%

46Shelby County, OHOH48,0651180%

47▼4Scioto County, OHOH71,365117−10%

48Auglaize County, OHOH45,909114−2%

49Ross County, OHOH76,429111+4%

50▲1Holmes County, OHOH44,970106+15%

51▲1Crawford County, OHOH41,896104−11%

52▲1Clinton County, OHOH42,301103+4%

53▼3Fulton County, OHOH41,853103−1%

54Logan County, OHOH46,302101+1%

55▲3Madison County, OHOH46,985101+17%

56▼1Seneca County, OHOH54,52299−7%

57▼1Preble County, OHOH40,66496−4%

58▲1Defiance County, OHOH38,29293−3%

59▲1Mercer County, OHOH42,73792+4%

60▼3Washington County, OHOH58,38992−8%

61▲1Brown County, OHOH44,39791+5%

62▼1Champaign County, OHOH38,820900%

63▲3Morrow County, OHOH36,30589+15%

64Perry County, OHOH35,91888+5%

65▼2Williams County, OHOH36,54987−7%

66▼1Darke County, OHOH51,52086−3%

67Highland County, OHOH43,82379+7%

68Jackson County, OHOH32,81778+1%

69Guernsey County, OHOH38,37973−6%

70Putnam County, OHOH34,38071−1%

71▲1Van Wert County, OHOH29,01371−2%

72▼1Fayette County, OHOH28,552700%

73Carroll County, OHOH26,47567−8%

74▲1Henry County, OHOH27,59866−6%

75▲2Coshocton County, OHOH37,18866+1%

76▼2Hocking County, OHOH27,51265−3%

77▼1Hardin County, OHOH30,07264−6%

78Gallia County, OHOH29,07262−6%

79Pike County, OHOH27,06161−2%

80Wyandot County, OHOH21,56753−6%

81Meigs County, OHOH21,58750−6%

82Adams County, OHOH27,86548+2%

83Paulding County, OHOH18,72745−8%

84▲1Noble County, OHOH14,27636+2%

85▼1Harrison County, OHOH14,07035−11%

86Morgan County, OHOH13,62633−9%

87Vinton County, OHOH12,64531−1%

88Monroe County, OHOH12,99429−14%

SHOWING 1–88 OF 88

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES