Ohio Population By County in 2021

Updated on August 1, 2024.

Based on the US Census Vintage data estimates, in 2021, the population of Ohio was 11,765,227. Among all Ohio counties, Franklin had the highest population (1,317,346), followed by Cuyahoga (1,247,496), and Hamilton (827,430). Vinton was the least populated county (12,703).

Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

You can see similar information for other states and by state for the United States.

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Ohio Population By County in 2021
Ohio Population By County in 2021
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County Population % of State Population
Adams 27574 0.23
Allen 101784 0.87
Ashland 52183 0.44
Ashtabula 97439 0.83
Athens 59096 0.50
Auglaize 46255 0.39
Belmont 65899 0.56
Brown 43696 0.37
Butler 387619 3.30
Carroll 26700 0.23
Champaign 38794 0.33
Clark 135608 1.15
Clermont 209893 1.78
Clinton 42115 0.36
Columbiana 101352 0.86
Coshocton 36658 0.31
Crawford 41782 0.36
Cuyahoga 1247496 10.60
Darke 51642 0.44
Defiance 38170 0.32
Delaware 221282 1.88
Erie 74886 0.64
Fairfield 161209 1.37
Fayette 28934 0.25
Franklin 1317346 11.20
Fulton 42499 0.36
Gallia 29224 0.25
Geauga 95708 0.81
Greene 168236 1.43
Guernsey 38287 0.33
Hamilton 827430 7.03
Hancock 74764 0.64
Hardin 30448 0.26
Harrison 14458 0.12
Henry 27560 0.23
Highland 43444 0.37
Hocking 28101 0.24
Holmes 44349 0.38
Huron 58412 0.50
Jackson 32539 0.28
Jefferson 65085 0.55
Knox 62543 0.53
Lake 232222 1.97
Lawrence 57408 0.49
Licking 180021 1.53
Logan 46158 0.39
Lorain 314216 2.67
Lucas 429482 3.65
Madison 44428 0.38
Mahoning 226529 1.93
Marion 65310 0.56
Medina 183394 1.56
Meigs 22078 0.19
Mercer 42392 0.36
Miami 109411 0.93
Monroe 13331 0.11
Montgomery 536155 4.56
Morgan 13703 0.12
Morrow 35205 0.30
Muskingum 86577 0.74
Noble 14309 0.12
Ottawa 40166 0.34
Paulding 18902 0.16
Perry 35464 0.30
Pickaway 58765 0.50
Pike 27094 0.23
Portage 159076 1.35
Preble 40871 0.35
Putnam 34341 0.29
Richland 125341 1.07
Ross 76500 0.65
Sandusky 58741 0.50
Scioto 72989 0.62
Seneca 54864 0.47
Shelby 48023 0.41
Stark 373792 3.18
Summit 537436 4.57
Trumbull 201572 1.71
Tuscarawas 92618 0.79
Union 65106 0.55
Van Wert 28784 0.25
Vinton 12703 0.11
Warren 246828 2.10
Washington 59486 0.51
Wayne 116175 0.99
Williams 36763 0.31
Wood 130310 1.11
Wyandot 21689 0.18