| Ohio River tributary | 20 |
| Ohio rubber center | 18 |
| Ohio rubber city | 16 |
| Ohio rubber plant site | 22 |
| Ohio school | 11 |
| Ohio senator | 12 |
| Ohio setting? | 13 |
| Ohio sitcom station | 19 |
| Ohio Stadium purchase | 21 |
| Ohio State athlete who forgot his uniform? | 42 |
| Ohio State basketball coach Matta | 33 |
| Ohio state flowers | 18 |
| Ohio State players | 18 |
| Ohio State's conference | 27 |
| Ohio statesman | 14 |
| Ohio stream | 11 |
| Ohio summer hrs. | 16 |
| Ohio sweaters? | 14 |
| Ohio team | 9 |
| Ohio team, on scoreboards | 25 |
| Ohio tigers | 11 |
| Ohio tire center | 16 |
| Ohio tire city | 14 |
| Ohio tire town | 14 |
| Ohio tornado city | 17 |
| Ohio town | 9 |
| Ohio town called the Bicycle Capital of the Midwest | 51 |
| Ohio town near Steubenville | 27 |
| Ohio town or its college | 24 |
| Ohio town where "there's a happiness" in an old Glenn Miller song | 79 |
| Ohio town whose name means "hospitality" in Greek | 59 |
| Ohio travel-guide listings | 26 |
| Ohio tribe | 10 |
| Ohio university | 15 |
| Ohio University city | 20 |
| Ohio University mascot | 22 |
| Ohio University site | 20 |
| Ohio university town | 20 |
| Ohio university whose team is the Golden Flashes | 48 |
| Ohio university, city, or county | 32 |
| Ohio urban redevelopment result? | 32 |
| Ohio vehicle | 12 |
| Ohio's "City of Invention" | 40 |
| Ohio's "Rubber City" | 34 |
| Ohio's area | 15 |
| Ohio's buckeye, California's redwood, etc. | 50 |
| Ohio's Great Lake | 21 |
| Ohio's Lake ___ College | 27 |
| Ohio's rubber city | 22 |
| Ohio's state flower | 23 |
| Ohio's state insect | 23 |
| Ohio's time zone | 20 |
| Ohio's Wright-Patterson, e.g.: Abbr. | 40 |
| Ohio's __ State | 19 |
| Ohio's ___ Point, home of the Top Thrill Dragster and Millennium Force roller coasters | 90 |
| Ohio, e.g. | 10 |
| Ohio, e.g.: Abbr. | 17 |
| Ohio, for one | 13 |
| Ohio, to René | 16 |
| Ohio-based faucet maker | 23 |
| Ohio-born acquirer of well over 1,000 patents | 45 |
| Ohio-born humorist Bombeck | 26 |
| Ohio-Indiana river | 18 |
| Ohio-Ontario divider | 20 |
| Ohio-Ontario separator | 22 |
| Ohio/Ontario separator | 22 |
| Ohioans | 7 |
| Ohiowa | 6 |
| Ohm of Ohm's law | 20 |
| Ohm or ampere | 13 |
| Ohm or joule, e.g. | 18 |
| Ohm or Solti | 12 |
| Ohm's antithesis | 20 |
| Ohm's symbol | 16 |
| Ohmage symbol | 13 |
| Ohms times amperes | 18 |
| Ohms x amperes | 14 |
| Ohne, across the Rhine | 22 |
| Oho, puzzlers! | 14 |
| Ohs in Ems | 11 |
| Ohs' partners | 17 |
| Ohs, in Germany | 15 |
| Oil | 3 |
| Oil / Insurance companies merge? | 32 |
| Oil a portion of veal? | 22 |
| Oil acronym | 11 |
| Oil additive | 12 |
| Oil additive since 1954 | 23 |
| Oil alcohol | 11 |
| Oil alternative | 15 |
| Oil amounts | 11 |
| Oil amts. | 9 |
| Oil and coal | 12 |
| Oil and gas company | 19 |
| Oil and gas, for two | 20 |
| Oil and gasoline giant | 22 |
| Oil and vinegar alternative | 27 |
| Oil and vinegar concoction | 26 |
| Oil and vinegar holder | 22 |
| Oil and vinegar holders | 23 |