RANKING · 2020 CENSUS · 88 SHOWN OF 88

Most population gained, Ohio counties · 2020

Ohio counties that added the most residents from the 2010 census to 2020, by raw count of people rather than percentage. This list covers the 88 counties in Ohio that qualify, ranked against each other statewide.

Flip the list · Most population lost, US counties →

OhioAll states All rankings

SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Franklin County, OHOH1,361,536+160,393+49%

02Delaware County, OHOH242,032+39,910−7%

03Warren County, OHOH257,181+29,644−33%

04Hamilton County, OHOH838,418+28,265−235%

05Butler County, OHOH400,128+22,227−46%

06Fairfield County, OHOH169,752+12,765−34%

07Licking County, OHOH185,564+12,027−30%

08Lorain County, OHOH323,219+11,608−14%

09Clermont County, OHOH216,977+11,238−60%

10Union County, OHOH73,446+10,484+17%

11Medina County, OHOH185,025+10,138−65%

12Wood County, OHOH134,176+6,760−13%

13Greene County, OHOH174,322+6,393−43%

14Miami County, OHOH112,634+6,268+10%

15Pickaway County, OHOH62,978+2,841−36%

16Lake County, OHOH232,217+2,562−79%

17Wayne County, OHOH116,758+2,374−77%

18Montgomery County, OHOH539,598+2,156−115%

19Geauga County, OHOH95,676+2,008−79%

20Holmes County, OHOH44,970+1,857−70%

21Knox County, OHOH64,002+1,800−74%

22Mercer County, OHOH42,737+1,714+16%

23Tuscarawas County, OHOH92,373+681−90%

24Auglaize County, OHOH45,909+473−77%

25Richland County, OHOH124,893+461−83%

26Madison County, OHOH46,985+389−88%

27Portage County, OHOH163,404+372−96%

28Muskingum County, OHOH87,014+336−87%

29Logan County, OHOH46,302+292−92%

30Van Wert County, OHOH29,013+187−123%

31Hancock County, OHOH75,034+138−98%

32Morrow County, OHOH36,305+123−97%

33Fulton County, OHOH41,853+15−100%

34Clinton County, OHOH42,301-22−100%

35Putnam County, OHOH34,380-48−105%

36Fayette County, OHOH28,552-79−108%

37Highland County, OHOH43,823-272−105%

38Coshocton County, OHOH37,188-289−124%

39Noble County, OHOH14,276-530−119%

40Williams County, OHOH36,549-540−124%

41Henry County, OHOH27,598-553−642%

42Jackson County, OHOH32,817-572−124%

43Vinton County, OHOH12,645-635−137%

44Perry County, OHOH35,918-650−126%

45Ashland County, OHOH52,523-692−114%

46Wyandot County, OHOH21,567-715−209%

47Stark County, OHOH373,771-733−107%

48Defiance County, OHOH38,292-751−601%

49Paulding County, OHOH18,727-808+314%

50Ross County, OHOH76,429-971−124%

51Huron County, OHOH58,250-1,061−133%

52Ottawa County, OHOH39,481-1,064−211%

53Adams County, OHOH27,865-1,073−155%

54Darke County, OHOH51,520-1,078+248%

55Marion County, OHOH65,115-1,142−159%

56Brown County, OHOH44,397-1,170−116%

57Shelby County, OHOH48,065-1,193−140%

58Morgan County, OHOH13,626-1,252−278%

59Monroe County, OHOH12,994-1,257+297%

60Preble County, OHOH40,664-1,271−157%

61Hocking County, OHOH27,512-1,330−149%

62Summit County, OHOH538,376-1,353−105%

63Hardin County, OHOH30,072-1,362−263%

64Harrison County, OHOH14,070-1,381+503%

65Champaign County, OHOH38,820-1,383−148%

66Erie County, OHOH73,296-1,457−153%

67Meigs County, OHOH21,587-1,560−1935%

68Pike County, OHOH27,061-1,621−147%

69Guernsey County, OHOH38,379-1,649−193%

70Seneca County, OHOH54,522-1,676+60%

71Gallia County, OHOH29,072-1,714−1590%

72Crawford County, OHOH41,896-1,759+95%

73Washington County, OHOH58,389-2,007−301%

74Sandusky County, OHOH58,655-2,048+1098%

75Carroll County, OHOH26,475-2,115−191%

76Athens County, OHOH63,197-2,326−187%

77Clark County, OHOH135,340-2,332−17%

78Belmont County, OHOH64,434-3,903+360%

79Ashtabula County, OHOH96,713-3,923−235%

80Allen County, OHOH100,881-4,125+222%

81Lawrence County, OHOH55,710-4,210−968%

82Jefferson County, OHOH63,597-4,460−30%

83Scioto County, OHOH71,365-5,491+385%

84Columbiana County, OHOH99,377-5,964−257%

85Trumbull County, OHOH198,972-8,335+209%

86Mahoning County, OHOH224,706-10,209+41%

87Lucas County, OHOH423,347-10,536+44%

88Cuyahoga County, OHOH1,232,925-15,305−16%

SHOWING 1–88 OF 88

Download CSV (full list, 88 rows)

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