Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Reeds Run | Stream | | Washington | 39 28 55 N | 081 24 44 W |
| Reeds School (historical) | School | 305 | Morgan | 39 44 47 N | 081 49 40 W |
| Reeds School (historical) | School | 280 | Noble | 39 49 55 N | 081 25 50 W |
| Reeds School (historical) | School | 356 | Wayne | 40 42 46 N | 081 42 23 W |
| Reedsburg | Populated Place | 316 | Wayne | 40 48 31 N | 082 06 25 W |
| Reedsburg Cemetery | Cemetery | 338 | Wayne | 40 48 27 N | 082 06 03 W |
| Reedsville | Populated Place | 195 | Meigs | 39 07 17 N | 081 44 51 W |
| Reedsville Cemetery | Cemetery | 191 | Meigs | 39 06 32 N | 081 44 50 W |
| Reedsville Post Office | Post Office | 195 | Meigs | 39 07 15 N | 081 44 49 W |
| Reedtown | Populated Place | 262 | Seneca | 41 09 07 N | 082 50 50 W |
| Reedtown Post Office (historical) | Post Office | 263 | Seneca | 41 09 05 N | 082 50 52 W |
| Reedurban | Populated Place | 331 | Stark | 40 47 40 N | 081 26 12 W |
| Reedurban Community Church | Church | 334 | Stark | 40 48 39 N | 081 26 56 W |
| Reedurban Elementary School | School | 323 | Stark | 40 47 26 N | 081 26 49 W |
| Reedurban Post Office (historical) | Post Office | 330 | Stark | 40 47 40 N | 081 26 14 W |
| Reedy School (historical) | School | 300 | Highland | 39 05 25 N | 083 48 42 W |
| Reel Lake | Reservoir | 279 | Jefferson | 40 32 08 N | 080 50 26 W |
| Reese | Populated Place | 225 | Franklin | 39 51 58 N | 082 57 10 W |
| Reese Corners | Locale | 360 | Licking | 40 04 33 N | 082 40 01 W |
| Reese Park | Park | 195 | Cuyahoga | 41 28 45 N | 081 52 49 W |
| Reese School (historical) | School | 234 | Muskingum | 39 49 50 N | 082 04 12 W |
| Reeses Post Office (historical) | Post Office | 225 | Franklin | 39 52 00 N | 082 57 10 W |
| Reesville | Populated Place | 330 | Clinton | 39 28 56 N | 083 40 37 W |
| Reesville Post Office | Post Office | 327 | Clinton | 39 28 55 N | 083 40 35 W |
| Reesville United Methodist Church | Church | 330 | Clinton | 39 28 54 N | 083 40 40 W |
| Reeves Creek | Stream | | Lawrence | 38 31 58 N | 082 22 59 W |
| Reeves Golf Course | Locale | 144 | Hamilton | 39 06 38 N | 084 24 30 W |
| Reeves Hollow | Valley | | Belmont | 39 54 44 N | 081 00 50 W |
| Reeves Hollow | Valley | | Vinton | 39 16 27 N | 082 21 00 W |
| Reeves Run | Stream | | Ross | 39 16 39 N | 083 08 41 W |
| Reevhorn Run | Stream | | Wyandot | 40 43 02 N | 083 27 34 W |
| Refinery Reservoir | Reservoir | 256 | Allen | 40 43 12 N | 084 07 60 W |
| Refinery Reservoir Dam | Dam | 256 | Allen | 40 43 12 N | 084 07 60 W |
| Reform | Populated Place | 254 | Licking | 40 08 12 N | 082 15 01 W |
| Reform Cemetery | Cemetery | 220 | Fulton | 41 30 13 N | 084 18 23 W |
| Reform Cemetery | Cemetery | 277 | Trumbull | 41 18 31 N | 080 55 46 W |
| Reform Post Office (historical) | Post Office | 266 | Licking | 40 08 10 N | 082 15 05 W |
| Reform Presbyterian Church | Church | 319 | Logan | 40 30 27 N | 083 44 58 W |
| Reformation Lutheran Church | Church | 238 | Franklin | 39 56 50 N | 082 52 43 W |
| Reformation Lutheran Church | Church | 189 | Lucas | 41 42 01 N | 083 36 16 W |
| Reformed Cemetery | Cemetery | 369 | Champaign | 40 07 53 N | 083 57 34 W |
| Reformed Cemetery | Cemetery | 280 | Seneca | 41 03 20 N | 083 00 57 W |
| Reformed Cemetery | Cemetery | 257 | Seneca | 41 09 56 N | 082 58 52 W |
| Reformed Church Cemetery | Cemetery | 369 | Ashland | 40 54 57 N | 082 23 16 W |
| Reformed Church Cemetery | Cemetery | 232 | Sandusky | 41 16 12 N | 082 50 56 W |
| Reformed Dissenting Presbyterian Cemetery (historical) | Cemetery | | Hamilton | 39 16 15 N | 084 28 04 W |
| Reformed Free Methodist Church | Church | 348 | Stark | 40 54 58 N | 081 05 51 W |
| Reformed Mennonite Cemetery | Cemetery | 245 | Allen | 40 54 18 N | 083 56 17 W |
| Refreshing Spring Church of God in Christ | Church | 181 | Butler | 39 23 30 N | 084 33 19 W |
| Refuge Apostolic Temple | Church | 305 | Mahoning | 41 05 42 N | 080 37 25 W |
| Refuge Church of Christ | Church | 244 | Franklin | 39 57 44 N | 082 57 60 W |
| Refuge Holy Tabernacle | Church | 187 | Lucas | 41 38 11 N | 083 33 05 W |
| Refuge Temple Pentecostal Church | Church | 162 | Hamilton | 39 07 17 N | 084 31 53 W |
| Refugee Cemetery | Cemetery | 303 | Fairfield | 39 54 54 N | 082 36 04 W |
| Regency Park | Park | 292 | Cuyahoga | 41 22 54 N | 081 43 26 W |
| Regent Playground | Park | 211 | Cuyahoga | 41 28 00 N | 081 38 31 W |
| Regina Coeli Catholic Church | Church | 183 | Lucas | 41 42 58 N | 083 33 28 W |
| Regina Coeli Catholic Church | Church | 357 | Stark | 40 54 57 N | 081 07 26 W |
| Regina Coeli School | School | 183 | Lucas | 41 42 58 N | 083 33 34 W |
| Regina Coeli School | School | 358 | Stark | 40 54 55 N | 081 07 26 W |
| Regina Hall | Building | 202 | Lucas | 41 42 43 N | 083 42 22 W |
| Regina Heights | Populated Place | 284 | Montgomery | 39 48 54 N | 084 16 18 W |
| Regina High School | School | 314 | Cuyahoga | 41 30 32 N | 081 31 07 W |
| Regina High School | School | 216 | Hamilton | 39 10 25 N | 084 26 57 W |
| Regular Baptist Cemetery | Cemetery | 308 | Perry | 39 53 19 N | 082 26 57 W |
| Rehm | Populated Place | 203 | Pike | 39 03 50 N | 082 57 40 W |
| Rehobeth Cemetery | Cemetery | 256 | Gallia | 38 56 40 N | 082 25 59 W |
| Rehobeth Cemetery | Cemetery | 286 | Morgan | 39 41 46 N | 081 39 35 W |
| Rehobeth Cemetery | Cemetery | 283 | Perry | 39 44 22 N | 082 11 40 W |
| Rehobeth Church | Church | 212 | Lawrence | 38 44 21 N | 082 30 45 W |
| Rehoboth | Populated Place | 284 | Perry | 39 44 37 N | 082 11 39 W |
| Rehoboth | Populated Place | 226 | Seneca | 41 13 05 N | 083 23 45 W |
| Rehoboth Cemetery | Cemetery | 286 | Clinton | 39 21 04 N | 083 55 47 W |
| Rehoboth Cemetery | Cemetery | 373 | Jefferson | 40 14 01 N | 080 51 33 W |
| Rehoboth Cemetery | Cemetery | 306 | Montgomery | 39 35 00 N | 084 10 01 W |
| Rehoboth Church | Church | 226 | Seneca | 41 13 03 N | 083 23 48 W |
| Rehoboth Post Office (historical) | Post Office | 279 | Perry | 39 44 35 N | 082 11 40 W |
| Rehoboth Temple | Church | 245 | Franklin | 39 58 05 N | 082 58 19 W |
| Reichard Hall | Building | 241 | Montgomery | 39 44 20 N | 084 10 43 W |
| Reichman Mine | Mine | 294 | Harrison | 40 25 20 N | 081 11 06 W |
| Reid Cemetery | Cemetery | 300 | Fairfield | 39 48 18 N | 082 25 12 W |
| Reid Elementary School | School | 329 | Clark | 39 54 47 N | 083 44 38 W |
| Reid Hall | Building | 269 | Butler | 39 30 40 N | 084 43 50 W |
| Reid Memorial Golf Course | Locale | 331 | Clark | 39 54 15 N | 083 45 30 W |
| Reid Memorial Park | Park | 299 | Clark | 39 57 05 N | 083 44 27 W |
| Reid Post Office (historical) | Post Office | 219 | Paulding | 41 11 40 N | 084 33 15 W |
| Reidel Cemetery | Cemetery | 283 | Marion | 40 32 17 N | 083 14 36 W |
| Reidenbach School (historical) | School | 245 | Van Wert | 40 53 18 N | 084 44 31 W |
| Reids (historical) | Populated Place | 218 | Paulding | 41 11 39 N | 084 33 13 W |
| Reifsnyder Park | Park | 319 | Stark | 40 49 45 N | 081 21 03 W |
| Reighard Park | Park | 225 | Fulton | 41 33 10 N | 084 07 56 W |
| Reilly Elementary School | School | 379 | Columbiana | 40 53 52 N | 080 50 56 W |
| Reily | Populated Place | 229 | Butler | 39 26 01 N | 084 45 40 W |
| Reily Cemetery | Cemetery | 256 | Butler | 39 25 47 N | 084 46 13 W |
| Reily Post Office (historical) | Post Office | 228 | Butler | 39 26 00 N | 084 45 40 W |
| Reinersville | Populated Place | 299 | Morgan | 39 41 12 N | 081 39 39 W |
| Reinersville Cemetery | Cemetery | 298 | Morgan | 39 41 19 N | 081 39 42 W |
| Reinersville Methodist Church | Church | 299 | Morgan | 39 41 16 N | 081 39 41 W |
| Reinersville Post Office | Post Office | 297 | Morgan | 39 41 10 N | 081 39 39 W |
| Reinersville School (historical) | School | 298 | Morgan | 39 41 20 N | 081 39 38 W |
| Reinhart Cemetery | Cemetery | 291 | Auglaize | 40 34 02 N | 084 06 28 W |
| Reisz Cemetery | Cemetery | 251 | Seneca | 41 03 01 N | 083 17 44 W |
| Reitz Run | Stream | | Wood | 41 29 48 N | 083 42 40 W |
| Relief | Populated Place | 195 | Washington | 39 35 20 N | 081 41 18 W |
| Relief (historical) | Populated Place | 281 | Huron | 41 04 22 N | 082 47 59 W |
| Remer Cemetery | Cemetery | 318 | Crawford | 40 44 37 N | 082 54 56 W |
| Reminderville | Populated Place | 308 | Summit | 41 20 45 N | 081 23 42 W |
| Reminderville Village Hall | Building | 308 | Summit | 41 20 46 N | 081 23 47 W |
| Remington | Populated Place | 177 | Hamilton | 39 13 41 N | 084 19 17 W |
| Remington Heliport | Airport | 350 | Licking | 40 05 51 N | 082 40 17 W |