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List of Ohio Counties and County Seats





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The U.S. state of Ohio is divided into 88 counties. Explore list of California Counties and their County Seats in alphabetical order populations, areas and the date of formation.

List of Ohio Counties and County Seat

S.NCountyCounty SeatPopulation(2011)Area Formed
1Adams CountyWest Union28,550583.91 sq miJuly 10, 1797
2Allen CountyLima106,331404.43 sq miMarch 1, 1820
3Ashland CountyAshland53,139424.37 sq miFebruary 24, 1846
4Ashtabula CountyJefferson101,497702.44 sq miJune 7, 1807
5Athens CountyAthens64,757506.76 sq miMarch 1, 1805
6Auglaize CountyWapakoneta45,949401.25 sq miFebruary 14, 1848
7Belmont CountySt. Clairsville70,400537.35 sq miSeptember 7, 1801
8Brown CountyGeorgetown44,846491.76 sq miMarch 1, 1818
9Butler CountyHamilton368,130467.27 sq miMay 1, 1803
10Carroll CountyCarrollton28,836394.67 sq miJanuary 1, 1833
11Champaign CountyUrbana40,097428.56 sq miMarch 1, 1805
12Clark CountySpringfield138,333399.86 sq miMarch 1, 1818
13Clermont CountyBatavia197,363451.99 sq miDecember 6, 1800
14Clinton CountyWilmington42,040410.88 sq miMarch 1, 1810
15Columbiana CountyLisbon107,841532.46 sq miMay 1, 1803
16Coshocton CountyCoshocton36,901564.07 sq miJanuary 31, 1810
17Crawford CountyBucyrus43,784402.11 sq miApril 1, 1820
18Cuyahoga CountyCleveland1,280,122458.49 sq miJune 7, 1807
19Darke CountyGreenville52,959599.80 sq miJanuary 3, 1809
20Defiance CountyDefiance39,037411.16 sq miApril 7, 1845
21Delaware CountyDelaware174,214442.41 sq miApril 1, 1808
22Erie CountySandusky77,079254.88 sq miMarch 15, 1838
23Fairfield CountyLancaster146,156505.11 sq miDecember 9, 1800
24Fayette CountyWashington Court House29,030406.58 sq miMarch 1, 1810
25Franklin CountyColumbus1,163,414539.87 sq miApril 30, 1803
26Fulton CountyWauseon42,698406.78 sq miApril 1, 1850
27Gallia CountyGallipolis30,934468.78 sq miApril 30, 1803
28Geauga CountyChardon93,389403.66 sq miMarch 1, 1806
29Greene CountyXenia161,573414.88 sq miMay 1, 1803
30Guernsey CountyCambridge40,087521.90 sq miMarch 1, 1810
31Hamilton CountyCincinnati802,374407.36 sq miJanuary 2, 1790
32Hancock CountyFindlay74,782531.35 sq miApril 1, 1820
33Hardin CountyKenton32,058470.29 sq miApril 1, 1820
34Harrison CountyCadiz15,864403.53 sq miFebruary 1, 1813
35Henry CountyNapoleon28,215416.50 sq miApril 1, 1820
36Highland CountyHillsboro43,589553.28 sq miMay 1, 1805
37Hocking CountyLogan29,380422.75 sq miMarch 1, 1818
38Holmes CountyMillersburg42,366422.99 sq miJanuary 20, 1824
39Huron CountyNorwalk59,626492.69 sq miMarch 7, 1809
40Jackson CountyJackson33,225420.28 sq miMarch 1, 1816
41Jefferson CountySteubenville69,709409.61 sq miJuly 29, 1797
42Knox CountyMount Vernon60,921527.12 sq miMarch 1, 1808
43Lake CountyPainesville230,041228.21 sq miMarch 6, 1840
44Lawrence CountyIronton62,450454.96 sq miDecember 21, 1815
45Licking CountyNewark166,492686.50 sq miMarch 1, 1808
46Logan CountyBellefontaine45,858458.44 sq miMarch 1, 1818
47Lorain CountyElyria301,356492.50 sq miDecember 26, 1822
48Lucas CountyToledo441,815340.46 sq miJune 20, 1835
49Madison CountyLondon43,435465.44 sq miMarch 1, 1810
50Mahoning CountyYoungstown238,823415.25 sq miMarch 1, 1846
51Marion CountyMarion66,501403.84 sq miApril 1, 1820
52Medina CountyMedina176,395423 sq miFebruary 18, 1812
53Meigs CountyPomeroy23,770429.42 sq miApril 1, 1819
54Mercer CountyCelina40,814463.27 sq miApril 1, 1820
55Miami CountyTroy102,506407.04 sq miMarch 1, 1807
56Monroe CountyWoodsfield14,642455.54 sq miJanuary 29, 1813
57Montgomery CountyDayton535,153461.68 sq miMay 1, 1803
58Morgan CountyMcConnelsville15,054417.66 sq miDecember 29, 1817
59Morrow CountyMount Gilead34,827406.22 sq miMarch 1, 1848
60Muskingum CountyZanesville86,074664.63 sq miMarch 1, 1804[16][17]
61Noble CountyCaldwell14,645399.00 sq miApril 1, 1851
62Ottawa CountyPort Clinton41,428254.95 sq miMarch 6, 1840
63Paulding CountyPaulding19,614416.26 sq miApril 1, 1820
64Perry CountyNew Lexington36,058409.78 sq miMarch 1, 1818
65Pickaway CountyCircleville55,698501.91 sq miMarch 1, 1810
66Pike CountyWaverly28,709441.49 sq miFebruary 1, 1815
67Portage CountyRavenna161,419492.39 sq miJune 7, 1807
68Preble CountyEaton42,270424.80 sq miMarch 1, 1808
69Putnam CountyOttawa34,499483.87 sq miApril 1, 1820
70Richland CountyMansfield124,475496.88 sq miMarch 1, 1808
71Ross CountyChillicothe78,064688.41 sq miAugust 20, 1798
72Sandusky CountyFremont60,944409.18 sq miApril 1, 1820
73Scioto CountyPortsmouth79,499612.27 sq miMay 1, 1803
74Seneca CountyTiffin56,745550.59 sq miApril 1, 1820
75Shelby CountySidney49,423409.27 sq miApril 1, 1819
76Stark CountyCanton375,586576.14 sq miFebruary 13, 1808
77Summit CountyAkron541,781419.38 sq miMarch 3, 1840
78Trumbull CountyWarren210,312616.48 sq miJuly 10, 1800
79Tuscarawas CountyNew Philadelphia92,582567.58 sq miMarch 15, 1808
80Union CountyMarysville52,300436.65 sq miApril 1, 1820
81Van Wert CountyVan Wert28,744410.09 sq miApril 1, 1820
82Vinton CountyMcArthur13,435414.08 sq miMarch 23, 1850
83Warren CountyLebanon212,693399.63 sq miMay 1, 1803
84Washington CountyMarietta61,778635.15 sq miJuly 27, 1788
85Wayne CountyWooster114,520555.36 sq miMarch 1, 1808
86Williams CountyBryan37,642421.74 sq miApril 1, 1820
87Wood CountyBowling Green125,488617.32 sq miApril 1, 1820
88Wyandot CountyUpper Sandusky22,615405.61 sq miFebruary 3, 1845