Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Rinehart Post Office (historical) | Post Office | 303 | Auglaize | 40 36 02 N | 084 01 56 W |
| Rineharts (historical) | Populated Place | 303 | Auglaize | 40 36 02 N | 084 01 56 W |
| Ring Cemetery | Cemetery | 244 | Williams | 41 35 33 N | 084 25 48 W |
| Ringgold | Populated Place | 281 | Morgan | 39 35 25 N | 081 58 47 W |
| Ringgold Cemetery | Cemetery | 322 | Morgan | 39 35 41 N | 081 58 31 W |
| Ringgold Free Methodist Church | Church | 283 | Morgan | 39 35 25 N | 081 58 45 W |
| Ringgold Post Office (historical) | Post Office | 280 | Morgan | 39 35 25 N | 081 50 44 W |
| Ringgold School (historical) | School | 283 | Morgan | 39 35 25 N | 081 58 45 W |
| Rings Cemetery | Cemetery | 287 | Franklin | 40 03 44 N | 083 10 59 W |
| Rings Mills Cemetery | Cemetery | 221 | Monroe | 39 36 42 N | 081 07 16 W |
| Rini Plaza Shopping Center | Locale | 225 | Lorain | 41 23 54 N | 081 59 38 W |
| Rinis Plaza Shopping Center | Locale | 266 | Cuyahoga | 41 19 22 N | 081 50 05 W |
| Rio Grande | Populated Place | 198 | Gallia | 38 52 46 N | 082 22 50 W |
| Rio Grande College | School | 202 | Gallia | 38 52 54 N | 082 22 47 W |
| Rio Grande Elementary School | School | 201 | Gallia | 38 52 59 N | 082 22 37 W |
| Rio Grande Post Office | Post Office | 199 | Gallia | 38 52 59 N | 082 22 50 W |
| Rio Grande Reservoir | Reservoir | 206 | Gallia | 38 53 00 N | 082 23 24 W |
| Rio Grande Reservoir Dam | Dam | 205 | Gallia | 38 53 00 N | 082 23 24 W |
| Rip Rap Road Park | Park | 232 | Montgomery | 39 51 05 N | 084 10 22 W |
| Ripley | Populated Place | 153 | Brown | 38 44 44 N | 083 50 42 W |
| Ripley Airport | Airport | 242 | Mercer | 40 40 54 N | 084 38 11 W |
| Ripley Cemetery | Cemetery | 220 | Gallia | 38 46 21 N | 082 22 25 W |
| Ripley Church | Church | 348 | Holmes | 40 39 04 N | 082 03 45 W |
| Ripley Elementary School | School | 182 | Brown | 38 44 53 N | 083 50 36 W |
| Ripley First Presbyterian Church | Church | 163 | Brown | 38 44 56 N | 083 50 47 W |
| Ripley Historic District | Park | 153 | Brown | 38 44 48 N | 083 50 48 W |
| Ripley Museum | Building | 159 | Brown | 38 44 56 N | 083 50 51 W |
| Ripley Post Office | Post Office | 153 | Brown | 38 44 39 N | 083 50 40 W |
| Ripley Run | Stream | | Hardin | 40 51 01 N | 083 33 55 W |
| Ripley School | School | 320 | Huron | 41 01 55 N | 082 35 02 W |
| Ripley Township Cemetery | Cemetery | 348 | Holmes | 40 39 06 N | 082 03 45 W |
| Ripley-Union-Lewis High School | School | 165 | Brown | 38 44 16 N | 083 50 22 W |
| Rippe Pond | Reservoir | 226 | Warren | 39 18 42 N | 084 14 42 W |
| Rippe Pond Dam | Dam | 226 | Warren | 39 18 42 N | 084 14 42 W |
| Ripple Cemetery | Cemetery | 360 | Ashland | 40 53 00 N | 082 14 58 W |
| Rippy Run | Stream | | Jefferson | 40 27 29 N | 080 47 21 W |
| Risen Cemetery | Cemetery | 324 | Morgan | 39 40 19 N | 081 55 25 W |
| Rising Park | Park | 269 | Fairfield | 39 43 34 N | 082 35 35 W |
| Rising Star Baptist Church | Church | 330 | Mahoning | 41 07 33 N | 080 35 22 W |
| Rising Star Baptist Church | Church | 226 | Montgomery | 39 44 18 N | 084 12 57 W |
| Rising Sun Baptist Church | Church | 186 | Lucas | 41 38 00 N | 083 30 47 W |
| Rising Sun School (historical) | School | 302 | Hardin | 40 42 52 N | 083 47 09 W |
| Risingsun | Populated Place | 218 | Wood | 41 16 10 N | 083 25 30 W |
| Risingsun Community Park | Park | 217 | Wood | 41 16 17 N | 083 25 40 W |
| Risingsun Post Office | Post Office | 219 | Wood | 41 16 08 N | 083 25 25 W |
| Risley (historical) | Populated Place | 302 | Medina | 41 08 10 N | 082 02 40 W |
| Ritas School | School | 268 | Montgomery | 39 48 55 N | 084 13 59 W |
| Ritchey Cemetery | Cemetery | 240 | Wyandot | 40 55 22 N | 083 20 29 W |
| Ritchie Hall | Building | 351 | Portage | 41 09 05 N | 081 20 47 W |
| Ritchie Ledges | Bench | 277 | Summit | 41 13 39 N | 081 31 09 W |
| Ritchie Residence Hall | Building | 321 | Summit | 41 04 36 N | 081 30 44 W |
| Ritchie Run | Stream | | Summit | 41 14 04 N | 081 32 49 W |
| Riton (historical) | Populated Place | 189 | Ross | 39 21 10 N | 082 58 11 W |
| Rittenhouse Farm (historical) | Locale | 366 | Wayne | 40 46 05 N | 082 03 02 W |
| Rittenour Cemetery | Cemetery | 174 | Pike | 39 04 04 N | 083 01 14 W |
| Rittenours | Populated Place | 183 | Ross | 39 12 59 N | 082 50 34 W |
| Ritter Astrophysical Research Center | Building | 182 | Lucas | 41 39 44 N | 083 36 43 W |
| Ritter Cemetery | Cemetery | 308 | Pickaway | 39 40 27 N | 082 51 05 W |
| Ritter Hall | Building | 206 | Lake | 41 42 56 N | 081 15 10 W |
| Ritter Library | Building | 241 | Cuyahoga | 41 22 23 N | 081 51 03 W |
| Ritter Marsh | Swamp | 175 | Ottawa | 41 37 08 N | 083 12 25 W |
| Ritter Public Library | Building | 182 | Erie | 41 25 19 N | 082 22 03 W |
| Ritter School (historical) | School | 269 | Fairfield | 39 52 14 N | 082 42 08 W |
| Ritter Wildlife Area | Park | 214 | Sandusky | 41 19 12 N | 083 18 13 W |
| Ritters (historical) | Populated Place | 232 | Fulton | 41 42 10 N | 084 16 12 W |
| Ritters Airport | Airport | 283 | Franklin | 40 00 02 N | 083 14 03 W |
| Ritters Post Office (historical) | Post Office | 233 | Fulton | 41 42 10 N | 084 16 10 W |
| Rittman | Populated Place | 299 | Wayne | 40 58 41 N | 081 46 55 W |
| Rittman Cemetery | Cemetery | 335 | Wayne | 40 58 23 N | 081 48 16 W |
| Rittman City Hall | Building | 300 | Wayne | 40 58 25 N | 081 46 52 W |
| Rittman Community Church | Church | 295 | Wayne | 40 58 57 N | 081 46 50 W |
| Rittman High School | School | 316 | Wayne | 40 58 28 N | 081 47 00 W |
| Rittman Middle School | School | 303 | Wayne | 40 58 29 N | 081 46 55 W |
| Ritzman Elementary School | School | 339 | Summit | 41 02 48 N | 081 26 11 W |
| River Bend Golf Course | Locale | 216 | Montgomery | 39 39 54 N | 084 16 36 W |
| River Bend Park | Park | 243 | Franklin | 39 55 09 N | 083 04 56 W |
| River Bend Subdivision | Populated Place | 174 | Gallia | 38 52 33 N | 082 08 35 W |
| River Cliff Cemetery | Cemetery | 341 | Morrow | 40 32 51 N | 082 49 21 W |
| River Corners | Populated Place | 264 | Medina | 41 06 23 N | 082 05 41 W |
| River Downs Racetrack | Locale | 147 | Hamilton | 39 03 02 N | 084 24 37 W |
| River East Plaza Shopping Center | Locale | 183 | Lucas | 41 38 47 N | 083 31 13 W |
| River Edge | Populated Place | 229 | Cuyahoga | 41 25 13 N | 081 51 01 W |
| River Edge School | School | 238 | Cuyahoga | 41 23 15 N | 081 51 37 W |
| River High School | School | 214 | Monroe | 39 40 28 N | 080 52 13 W |
| River Hill Cemetery | Cemetery | 384 | Tuscarawas | 40 18 25 N | 081 28 22 W |
| River Hill Cemetery | Cemetery | 279 | Tuscarawas | 40 19 51 N | 081 26 10 W |
| River of Life Church | Church | 305 | Summit | 41 05 11 N | 081 32 04 W |
| River Park | Park | 149 | Hamilton | 39 07 28 N | 084 42 17 W |
| River Park | Park | 145 | Hamilton | 39 07 33 N | 084 42 24 W |
| River Place Shopping Center | Locale | 194 | Wood | 41 32 16 N | 083 38 11 W |
| River Plaza Shopping Center | Locale | 218 | Cuyahoga | 41 27 35 N | 081 51 47 W |
| River Road Camp | Locale | 213 | Lake | 41 34 27 N | 081 25 20 W |
| River Road Cemetery | Cemetery | 286 | Medina | 41 07 17 N | 081 48 46 W |
| River Road Park | Park | 250 | Lake | 41 44 25 N | 081 05 19 W |
| River Run Centre Shopping Center | Locale | 224 | Coshocton | 40 15 49 N | 081 52 11 W |
| River Styx | Populated Place | 312 | Medina | 41 03 25 N | 081 47 59 W |
| River Styx Cemetery | Cemetery | 311 | Medina | 41 03 14 N | 081 47 52 W |
| River Styx County Park | Park | 319 | Medina | 41 02 52 N | 081 47 54 W |
| River Styx Post Office (historical) | Post Office | 313 | Medina | 41 03 25 N | 081 48 01 W |
| River Trail | Trail | 312 | Washington | 39 26 55 N | 081 09 53 W |
| River Valley Elementary School | School | 302 | Marion | 40 36 32 N | 083 01 59 W |
| River Valley High School | School | 303 | Marion | 40 36 38 N | 083 01 59 W |
| River Valley Mall Shopping Center | Locale | 251 | Fairfield | 39 44 00 N | 082 37 35 W |
| River View (subdivision) | Populated Place | 181 | Butler | 39 24 47 N | 084 33 39 W |
| River View Heights (subdivision) | Populated Place | 194 | Wood | 41 32 32 N | 083 37 15 W |
| River View High School | School | 238 | Coshocton | 40 20 22 N | 081 57 32 W |
| River View School | School | 340 | Summit | 41 08 44 N | 081 25 56 W |
| River View Yacht Club | Locale | 175 | Lucas | 41 43 43 N | 083 27 60 W |
| Riverbend Amphitheater | Building | 146 | Hamilton | 39 03 07 N | 084 25 08 W |
| Riverbend Art Center | Building | 230 | Montgomery | 39 46 09 N | 084 11 22 W |