RANKING · 2010 CENSUS · 88 SHOWN OF 88

Largest by population, Ohio counties · 2010

The most populous Ohio counties as of the 2010 population estimates. This list covers the 88 counties in Ohio that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDFastest growing Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR1990 2000 2010 2020 2025

RANKPLACESTATETOTAL POPULATIONVS 2000

01Cuyahoga County, OHOH1,280,122−8%

02Franklin County, OHOH1,163,414+9%

03Hamilton County, OHOH802,374−5%

04Summit County, OHOH541,781−0%

05Montgomery County, OHOH535,153−4%

06Lucas County, OHOH441,815−3%

07Stark County, OHOH375,586−1%

08Butler County, OHOH368,130+11%

09Lorain County, OHOH301,356+6%

10Mahoning County, OHOH238,823−7%

11Lake County, OHOH230,041+1%

12Warren County, OHOH212,693+34%

13Trumbull County, OHOH210,312−7%

14Clermont County, OHOH197,363+11%

15Delaware County, OHOH174,214+58%

16Medina County, OHOH172,332+14%

17Licking County, OHOH166,492+14%

18Greene County, OHOH161,573+9%

19Portage County, OHOH161,419+6%

20Fairfield County, OHOH146,156+19%

21Clark County, OHOH138,333−4%

22Wood County, OHOH125,488+4%

23Richland County, OHOH124,475−3%

24Wayne County, OHOH114,520+3%

25Columbiana County, OHOH107,841−4%

26Allen County, OHOH106,331−2%

27Miami County, OHOH102,506+4%

28Ashtabula County, OHOH101,497−1%

29Geauga County, OHOH93,389+3%

30Tuscarawas County, OHOH92,582+2%

31Muskingum County, OHOH86,074+2%

32Scioto County, OHOH79,499+0%

33Ross County, OHOH78,064+6%

34Erie County, OHOH77,079−3%

35Hancock County, OHOH74,782+5%

36Belmont County, OHOH70,400+0%

37Jefferson County, OHOH69,709−6%

38Marion County, OHOH66,501+0%

39Athens County, OHOH64,757+4%

40Lawrence County, OHOH62,450+0%

41Washington County, OHOH61,778−2%

42Sandusky County, OHOH60,944−1%

43Knox County, OHOH60,921+12%

44Huron County, OHOH59,626+0%

45Seneca County, OHOH56,745−3%

46Pickaway County, OHOH55,698+6%

47Ashland County, OHOH53,139+1%

48Darke County, OHOH52,959−1%

49Union County, OHOH52,300+28%

50Shelby County, OHOH49,423+3%

51Auglaize County, OHOH45,949−1%

52Logan County, OHOH45,858−0%

53Brown County, OHOH44,846+6%

54Crawford County, OHOH43,784−7%

55Highland County, OHOH43,589+7%

56Madison County, OHOH43,435+8%

57Fulton County, OHOH42,698+1%

58Holmes County, OHOH42,366+9%

59Preble County, OHOH42,270−0%

60Clinton County, OHOH42,040+4%

61Ottawa County, OHOH41,428+1%

62Mercer County, OHOH40,814−0%

63Champaign County, OHOH40,097+3%

64Guernsey County, OHOH40,087−2%

65Defiance County, OHOH39,037−1%

66Williams County, OHOH37,642−4%

67Coshocton County, OHOH36,901+1%

68Perry County, OHOH36,058+6%

69Morrow County, OHOH34,827+10%

70Putnam County, OHOH34,499−1%

71Jackson County, OHOH33,225+2%

72Hardin County, OHOH32,058+0%

73Gallia County, OHOH30,934−0%

74Hocking County, OHOH29,380+4%

75Fayette County, OHOH29,030+2%

76Carroll County, OHOH28,836+0%

77Van Wert County, OHOH28,744−3%

78Pike County, OHOH28,709+4%

79Adams County, OHOH28,550+4%

80Henry County, OHOH28,215−3%

81Meigs County, OHOH23,770+3%

82Wyandot County, OHOH22,615−1%

83Paulding County, OHOH19,614−3%

84Harrison County, OHOH15,864+0%

85Morgan County, OHOH15,054+1%

86Noble County, OHOH14,645+4%

87Monroe County, OHOH14,642−4%

88Vinton County, OHOH13,435+5%

SHOWING 1–88 OF 88

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS