1850 Counties of  Ohio

County Description Area in sq miles Courts held at Pop in 1850
Adams southern part, on Ohio river 550 Adamsvile & West Union 18,853
Allen northwest part, water by Auglaize, St Mary's & Miami rivers 554 Lima 12,109
Ashland northern part blank Ashland 23,811
Ashtabula northeast part on Lake Erie, water by Grand & Ashtabula river 700 Jefferson 28,766
Athens southeast part, next to Ohio river & crossed by Hockkocking river 900 Athens 18,215
Auglaize western part blank Wapaukonetta 11,344
Belmont in east part, on west died of Ohio river 500 St Clairsville 34,600
Brown south boundary, on north side of Ohio river 470 Georgetown 27,332
Butler southwest part, crossed by Miami river & the Miami canal 480 Hamilton 30,789
Carroll eastern part 400 Carrollton 17,685
Champaign western part, crossed by Mud river 450 Urbana 19,762
Clermont southern boundary, on north side of Ohio river 450 Batavia 30,455
Clinton southwest corner, drained by tributaries of Little Miami river 400 Wilmington 18,838
Columbiana east boundary, Ohio river on southeast 750 New Lisbon 33,621
Coshocton near central part 562 Coshocton 25,674
Crawford north part, drained by Sandusky river 590 Bueyrus 18,177
Cuyahoga northern boundary on Lake Erie, crossed by Cuyahoga river 475 Cleveland 48,099
Darke western boundary 714 Greenville 20,274
Defiance west boundary, crossed by Maumee river blank Defiance 6,966
Delaware central part, water by Scioto & Whetstone rivers 610 Delaware 21,817
Erie northern boundary, south of Lake Erie 150 Sandusky 18,568
Fairfield southeast part 54 Lancaster 30,264
Fayette southern part 415 Washington 12,726
Franklin central part, crossed by Scioto river 529 Columbus 42,910
Fulton northern boundary blank Gorham 7,781
Gallia south eastern boundary, Ohio river on east 500 Gallipolis 17,063
Geauga north eastern part 576 Chardon 17,827
Greene southwest part, crossed by Little Miami & Mad rivers 400 Xenia 22,946
Guernsey eastern part, valley of Wells creek 676 Cambridge 30,438
Hamilton southwest corner, Ohio river on south, crossed by Miami & Little Miami rivers & Miami canal 400 Cincinnati 156,843
Hancock northwest part 576 Finley 11,751
Hardin northwestern part 480 Kenton 8,265
Harrison eastern part 486 Cadiz 20,158
Henry north western part, crossed by Maumee river 576 Napoleon 3,435
Highland southern part 555 Hillsborough 25,781
Hocking southern part, crossed by Hocking river 432 Logan 14,119
Holmes north eastern part 422 Millersburgh 20,452
Huron northern part 800 Norwalk 26,203
Jackson southern part 400 Jackson 12,621
Jefferson east boundary on Ohio river 396 Steubenville 29,132
Knox central part 618 Mount Vernon 28,773
Lake north boundary on Lake Erie 820 Painesville 14,650
Lawrence southern boundary, Ohio river on south 430 Burlington 15,726
Licking central part 666 Newark 38,852
Logan toward west part 425 Bellefontaine 19,162
Lorain northern boundary, on Lake Erie 540 Elyria 26,086
Lucas northern boundary, Maumee river on southeast 600 Maumee City 12,263
Madison central part 400 London 10,046
Mohoning eastern boundary blank Canfield 23,735
Marion toward north part 460 Marion 12,618
Medina north part 450 Medina 24,441
Meigs southeastern boundary on Ohio river 425 Pomeroy 17,969
Mercer western boundary 576 Celina 7,712
Miami western part, crossed by Miami river 410 Troy 24,996
Monroe southeastern boundary, Ohio river on southeast 520 Woodsfield 28,151
Montgomery southwest part, crossed by Miami river 480 Dayton 38,219
Morgan southeastern part, crossed by Muskingum river 500 M'Connelsville 28,585
Morrow central part blank Mount Gilead 20,280
Muskingum southeast part, crossed by Muskingum river 665 Zanesville 45,037
Noble southeast part, water by branches of Will's creek; Muskingum & Ohio rivers 450 Sarahsville organized since 1850
Ottawa northern boundary, Lake Erie on north, Sandusky bay on southeast 350 Port Clinton 3,308
Perry central part 400 Somerset 20,775
Pickaway central part, crossed by Scioto river 470 Circleville 21,008
Pike south part, crossed by Scioto river 421 Piketon 10,953
Portage in northeastern part, crossed by Cuyahoga & Tuscarawas rivers, which are separated by a portage of one mile 500 Ravenna 24,419
Preble on west boundary 432 Eaton 21,736
Putnam northwest part, crossed by Auglaize river 376 Kalida 7,221
Richland toward northern part 900 Mansfield 30,879
Ross toward southern part, crossed by Scioto river 650 Chillicothe 32,071
Sandusky north part, Sandusky bay on northeast, crossed by Sanducky river 320 Fremont 14,305
Scioto on southern boundary, Ohio river on south, crossed by Scioto river 600 Portsmouth 18,438
Seneca north part, crossed by Sandusky river 540 Tiffin 37,105
Shelby western part, crossed by Miami river 418 Sidney 13,958
Stark in east part, crossed by Tuscarawas river 650 Canton 39,878
Summit in northeast part, crossed by Cuyahoga river 422 Akron 27,485
Trumbull east boundary, crossed by Mahoning river 875 Warren 30,491
Tuscarawas eastern part, crossed by Tuscarawas river 655 New Philadelphia 31,161
Union toward western part 450 Marysville 12,204
Van Wert on west boundary 432 Van Wert 4,816
Vinton in southern part blank McArthur 9,353
Warren in southwest part, crossed by Little Miami river 400 not given 25,571
Washington on southeast boundary, Ohio river on southeast, crossed by Muskingum river 713 Marietta 29,540
Wayne toward northeast part 660 Wooster 32,981
Williams at northwest corner 600 Bryan 8,018
Wood in north part, Maumee river on northwest 590 Perrysburgh 9,257
Wyandott toward north part blank Upper Sandusky 11,292

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