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What are the largest counties in Ohio?

Franklin County is the largest county in Ohio, with 1,361,536 residents in 2025 (Census PEP). Cuyahoga County (1,232,925) and Hamilton County (838,418) come next.

Data as of 2025 · updated

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All 88 ranked Ohio counties

Ohio counties ranked by population
RankCountyResidents 2025Change 2020–25
1Franklin County1,361,536+2.8%
2Cuyahoga County1,232,925−2.4%
3Hamilton County838,418+1.0%
4Montgomery County539,598+0.5%
5Summit County538,376−0.3%
6Lucas County423,347−1.7%
7Butler County400,128+2.4%
8Stark County373,771−0.2%
9Lorain County323,219+3.1%
10Warren County257,181+5.7%
11Delaware County242,032+12.5%
12Lake County232,217−0.1%
13Mahoning County224,706−1.4%
14Clermont County216,977+3.9%
15Trumbull County198,972−1.3%
16Licking County185,564+3.8%
17Medina County185,025+1.3%
18Greene County174,322+3.7%
19Fairfield County169,752+6.5%
20Portage County163,404+1.0%
21Clark County135,340−0.4%
22Wood County134,176+1.5%
23Richland County124,893−0.1%
24Wayne County116,758−0.1%
25Miami County112,634+3.4%
26Allen County100,881−1.2%
27Columbiana County99,377−2.2%
28Ashtabula County96,713−0.8%
29Geauga County95,676+0.3%
30Tuscarawas County92,373−0.9%
31Muskingum County87,014+0.7%
32Ross County76,429−0.8%
33Hancock County75,034+0.1%
34Union County73,446+16.5%
35Erie County73,296−2.9%
36Scioto County71,365−3.4%
37Marion County65,115−0.4%
38Belmont County64,434−2.8%
39Knox County64,002+1.9%
40Jefferson County63,597−2.4%
41Athens County63,197+1.3%
42Pickaway County62,978+7.4%
43Sandusky County58,655−0.4%
44Washington County58,389−2.1%
45Huron County58,250−0.4%
46Lawrence County55,710−4.2%
47Seneca County54,522−1.0%
48Ashland County52,523+0.1%
49Darke County51,520−0.7%
50Shelby County48,065−0.2%
51Madison County46,985+7.1%
52Logan County46,302+0.4%
53Auglaize County45,909−1.2%
54Holmes County44,970+1.7%
55Brown County44,397+1.6%
56Highland County43,823+1.1%
57Mercer County42,737+0.5%
58Clinton County42,301+0.6%
59Crawford County41,896−0.3%
60Fulton County41,853−1.9%
61Preble County40,664−0.8%
62Ottawa County39,481−2.0%
63Champaign County38,820+0.2%
64Guernsey County38,379−0.1%
65Defiance County38,292+0.1%
66Coshocton County37,188+1.6%
67Williams County36,549−1.4%
68Morrow County36,305+3.7%
69Perry County35,918+1.3%
70Putnam County34,380−0.0%
71Jackson County32,817+0.4%
72Hardin County30,072−2.1%
73Gallia County29,072−0.5%
74Van Wert County29,013+0.3%
75Fayette County28,552−1.4%
76Adams County27,865+1.5%
77Henry County27,598−0.2%
78Hocking County27,512−1.9%
79Pike County27,061−0.0%
80Carroll County26,475−1.1%
81Meigs County21,587−2.6%
82Wyandot County21,567−1.4%
83Paulding County18,727−0.4%
84Noble County14,276+1.3%
85Harrison County14,070−3.0%
86Morgan County13,626−0.9%
87Monroe County12,994−2.7%
88Vinton County12,645−1.2%

How this is ranked

The Census Bureau's July 1 resident population estimates for 2025, largest first, with the change since 2020. Counties with fewer than 1,000 residents are not ranked. Areas without an estimate for the same year as the others are not ranked.

Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025). Figures come from public federal statistics and are informational only, not investment advice. Check the source before relying on a number. Methodology: how ranks and figures are built.

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Questions

What is the largest county in Ohio?

Franklin County is the largest county in Ohio, with 1,361,536 residents in 2025 (Census PEP). Cuyahoga County (1,232,925) and Hamilton County (838,418) come next.

How is this ranking calculated?

The Census Bureau's July 1 resident population estimates for 2025, largest first, with the change since 2020. Counties with fewer than 1,000 residents are not ranked. Areas without an estimate for the same year as the others are not ranked.

More rankings for Ohio

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