1850 Counties of  Ohio

    in area Courts held at Pop in 1850
Adams Co, OH southern part, on Ohio river 550 sq miles Adamsvile & West Union 18,853
Allen Co, OH northwest part, water by Auglaize, St Mary's & Miami rivers 554 sq miles Lima 12,109
Ashland Co, OH northern part (blank) Ashland 23,811
Ashtabula Co, OH northeast part on Lake Erie, water by Grand & Ashtabula river 700 sq miles Jefferson 28,766
Athens Co, OH southeast part, next to Ohio river & crossed by Hockkocking river 900 sq miles Athens 18,215
Auglaize Co, OH western part (blank) Wapaukonetta 11,344
Belmont Co, OH in east part, on west died of Ohio river 500 sq miles St Clairsville 34,600
Brown Co, OH south boundary, on north side of Ohio river 470 sq miles Georgetown 27,332
Butler Co, OH southwest part, crossed by Miami river & the Miami canal 480 sq miles Hamilton 30,789
Carroll Co, OH eastern part 400 Carrollton 17,685
Champaign Co, OH western part, crossed by Mud river 450 Urbana 19,762
Clermont Co, OH southern boundary, on north side of Ohio river 450 Batavia 30,455
Clinton Co, OH southwest corner, drained by tributaries of Little Miami river 400 Wilmington 18,838
Columbiana Co, OH east boundary, Ohio river on southeast 750 New Lisbon 33,621
Coshocton Co, OH near central part 562 Coshocton 25,674
Crawford Co, OH north part, drained by Sandusky river 590 Bueyrus 18,177
Cuyahoga Co, OH northern boundary on Lake Erie, crossed by Cuyahoga river 475 Cleveland 48,099
Darke Co, OH western boundary 714 Greenville 20,274
Defiance Co, OH west boundary, crossed by Maumee river blank Defiance 6,966
Delaware Co, OH central part, water by Scioto & Whetstone rivers 610 Delaware 21,817