Columbus area. Delaware (to the north) and Licking (to the northwest) share three districts between them. Franklin County then has ten districts. I drew them with the aim of not splitting any non-Columbus townships, minimizing weird exclaves (can't eliminate them all though), and making two black-majority districts (Franklin is over 20% black, and the AA population is reasonably compact).
District 42: DELAWARE-ORANGE. O 41.4%, D 39.4%. The all-Delaware district. Safe R.
District 43: GENOA-PATASKALA. O 37.2%, D 37.4%. The Delaware-Licking district. Safe R.
District 44: NEWARK. O 43.0%, D 47.1%. The all-Licking district. Safe R.
District 45: WESTERVILLE-COLUMBUS NORTHEAST. O 57.1%, D 53.1%. 68W/23B. Lean D.
District 46: GAHANNA-REYNOLDSBURG-NEW ALBANY. O 52.5%, D 49.7%. 75W/17B. Tries to mostly stay out of Columbus proper, which is of course a fool's errand here. Tossup.
District 47: WORTHINGTON-COLUMBUS NORTHWEST. O 54.5%, D 52.0%. Lean D.
District 48: WHITEHALL-COLUMBUS LINDEN-AIRPORT. O 81.0%, D 77.0%. 40W/51B. The "near northeast". Black-majority, Safe D.
District 49: UPPER ARLINGTON- COLUMBUS UNIVERSITY-CLINTONVILLE. O 61.2%, D 60.2%. The "near northwest". The hook over 48 is trying to get all those islands of Clinton Twp. in one district. Safe D.
District 50: BEXLEY-COLUMBUS EAST. O 82.6%, D 78.1%. 38B/54B. The "near southeast". Black-majority, Safe D.
District 51: COLUMBUS HILLTOP-SOUTHWEST-GRANDVIEW. O 59.9%, D 61.4%. 76W/14B. Safe D.
District 52: DUBLIN-HILLIARD. O 46.0%, D 43.9%. Erm… Safe R, though perhaps not forever.
District 53: GROVE CITY-COLUMBUS WESTLAND. O 44.9%, D 47.4% The southwest. Eh, Lean R though maybe safe would be better.
District 54: COLUMBUS CENTER-FAR SOUTH. O 61.9%, D 62.7%. 76W/17B. The border between this district and 50 creates an odd shape here for this downtown-cum-far southeastern district, it was done this way to get the second black district. Safe D.
South of Columbus and the Ohio River area, some outer Columbus metro but mostly rural and small-town. Fairfield County is split on account of being too large, all the other districts here are whole county.
District 55: PICKAWAY-MADISON. O 37.2%, D 42.6%. Also includes a small portion of Fairfield, but no large towns there worth putting in the district name. Both 55 and 56 are quite overpopulated. Safe R.
District 56: LANCASTER-PICKERINGTON. O 41.7%, D 43.8%. The all-Fairfield district. And the colors roll over for the last district in the Columbus MSA proper. Safe R.
District 57: ROSS-FAYETTE. O 43.3%, D 50.5%. Chillicothe and Washington Court House, both micropolitan areas appended to the Columbus CSA. Lean R.
District 58: HIGHLAND-JACKSON-PIKE. O 40.0%, D 49.2% Towns include Hillsboro, Waverly, Jackson. Incredibly, this is the one and only district in Ohio to not have any metro or micropolitan areas in it (of course, micro areas are often quite rural in character). The D average is close… but eh, Safe R anyway; the D average in this region is goosed on account of Ted Strickland being from the area.
District 59: SCIOTO-ADAMS. O 43.4%, D 55.7%. The Portsmouth district. Lean R, which is what I'm going to give most of these "bad Obama, good Dem average" districts.
District 60: LAWRENCE-GALLIA-MEIGS. O 39.6%, D 56.9%. Ironton is the largest town in this Ohio River district. but it's out of view to the south. Lean R.
District 61: ATHENS-HOCKING-VINTON. O 59.2%, D 66.8%. Safe D.
District 62: WASHINGTON-MORGAN-NOBLE-MONROE. O 43.3%, D 58.7%. Marietta is the largest town. Lean R.
District 63: MUSKINGUM-PERRY. O 45.9%, D 52.8%. The Zanesville district. Lean R.
Moving north up the Ohio River/Appalachians, plus Stark (Canton) and Wayne (Wooster). Stark has three whole districts and one it splits with Tuscarawas, everything else is whole county.
District 64: BELMONT-GUERNSEY. O 48.1%, D 62.9%. Cambridge, St. Clairsville, Wheeling WV suburbs. Erm… Lean D; local Dems should do better than Obama here.
District 65: JEFFERSON-CARROLL-HARRISON. O 48.1%, D 62.9%. The Steubenville district. Yep, exact same partisan numbers as the last one. Lean D.
District 66: HOLMES-COSHOCTON-NEWCOMERSTOWN. O 40.2%, D 45.5%. Coshocton, Amish Country, the south and west of Tuscarawas. Safe R.
District 67: COLUMBIANA. O 45.1%, D 61.9%. East Liverpool, Salem. Tossup.
District 68: NEW PHILADELPHIA-CANAL FULTON-BREWSTER. O 49.5%, D 55.9%. The Tuscarawas-Stark district. "Stark South and West" would be better than trying to list towns all of which are not too large. The disconnected precinct of 68 next to Alliance is a DRA bug, I assume. Tossup.
District 69: CANTON. O 61.8%, D 61.3%. 81W/15B. Plain Township, north of Canton, is split between this and 71. It was the least bad option. Brown, just like a football, fitting given the legacy of the Canton Bulldogs and its status as the birthplace of the NFL. Safe D.
District 70: MASSILLON. O 50.7%, D 52.5%. Orange in honor of the Masillon Tigers, of course. (No, actually, like the Canton district that was just a coincidence. But one I like quite much.) Tossup.
District 71: ALLIANCE-LOUISVILLE. O 45.7%, D 49.5%. Northeast Stark. Lean R.
District 72: WAYNE. O 41.6%, D 44.1%. The Wooster district. Safe R.
The northeast corner of the state: Mahoning Valley, Ashtabula, and eastern Cleveland burbs. Mahoning, Trumbull, and Lake all neatly divide into two (though Mahoning is overpopulated and Trumbull underpopulated.) Then there's a three-district chain between Ashtabula, Geauga, and Portage.
District 73: AUSTINTOWN-CANFIELD. O 54.1%, D 69.8%. Aka the outer Mahoning district. Safe D.
District 74: YOUNGSTOWN-BOARDMAN. O 71.7%, D 80.6%. 65W/26B. Safe D.
District 75: NILES-GIRARD. O 59.4%, D 73.3%. Eastern Trumbull. Safe D.
District 76: WARREN. O 60.8%, D 73.0%. 86W/12B. Western Trumbull. Safe D.
District 77: ASHTABULA. O 53.8%, D 55.4%. A little bit of Geauga as well, since Ashtabula is just a bit too small to be one district. Lean D.
District 78: PAINESVILLE-MADISON. O 48.3%, D 48.5%. Lake County, east and south. Lean R.
District 79: MENTOR-WILLOUGHBY. O 50.8%, D 52.2%. The more urban bits of Lake. Tossup.
District 80: GEAUGA-STREETSBORO. O 43.8%, D 46.9%. Not technically all of Geauga, but most of it and there aren't any notable placenames in that exurban/farms mix of a county. Also a little bit of northwest Portage that doesn't fit in 81. Safe R.
District 81: KENT-RAVENNA. O 55.9%, D 66.0%. The bulk of Portage. Safe D.
This'll need a Part III.