Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Ridge Road Junior High School | School | 287 | Cuyahoga | 41 22 53 N | 081 44 08 W |
| Ridge School (historical) | School | 317 | Allen | 40 43 03 N | 083 53 59 W |
| Ridge School (historical) | School | 364 | Ashland | 40 43 57 N | 082 11 01 W |
| Ridge School (historical) | School | 313 | Crawford | 40 56 42 N | 082 47 52 W |
| Ridge School (historical) | School | 307 | Darke | 40 17 05 N | 084 27 17 W |
| Ridge School (historical) | School | 330 | Fairfield | 39 39 38 N | 082 49 09 W |
| Ridge School (historical) | School | 323 | Licking | 40 02 08 N | 082 12 47 W |
| Ridge School (historical) | School | 335 | Perry | 39 47 58 N | 082 23 13 W |
| Ridge School (historical) | School | 259 | Van Wert | 40 44 31 N | 084 40 07 W |
| Ridge School (historical) | School | 266 | Warren | 39 23 53 N | 084 12 36 W |
| Ridge School (historical) | School | 270 | Wyandot | 40 58 37 N | 083 26 24 W |
| Ridge-Day Shopping Center | Locale | 290 | Cuyahoga | 41 22 45 N | 081 44 00 W |
| Ridgebrook Elementary School | School | 255 | Cuyahoga | 41 24 57 N | 081 44 21 W |
| Ridgebury Elementary School | School | 309 | Cuyahoga | 41 31 45 N | 081 29 37 W |
| Ridgebury Park | Park | 283 | Greene | 39 41 06 N | 083 57 36 W |
| Ridgecrest Park | Park | 242 | Montgomery | 39 48 02 N | 084 11 55 W |
| Ridgedale (subdivision) | Populated Place | 335 | Stark | 40 49 35 N | 081 25 19 W |
| Ridgedale High School | School | 293 | Marion | 40 38 53 N | 083 10 27 W |
| Ridgedale Middle School | School | 293 | Marion | 40 38 52 N | 083 10 27 W |
| Ridgeland | Populated Place | 201 | Jackson | 39 00 49 N | 082 31 21 W |
| Ridgelawn Cemetery | Cemetery | 226 | Gallia | 38 39 23 N | 082 16 01 W |
| Ridgelawn Cemetery | Cemetery | 219 | Lorain | 41 22 24 N | 082 05 49 W |
| Ridgemont Elementary School | School | 320 | Hardin | 40 32 01 N | 083 31 27 W |
| Ridgemont High School | School | 323 | Hardin | 40 30 53 N | 083 34 17 W |
| Ridgeton | Populated Place | 307 | Crawford | 40 53 59 N | 082 56 42 W |
| Ridgetop Golf Course | Locale | 361 | Medina | 41 04 15 N | 081 48 48 W |
| Ridgeview Burial Park | Cemetery | 235 | Ashtabula | 41 50 21 N | 080 48 19 W |
| Ridgeview Cemetery | Cemetery | 356 | Harrison | 40 21 43 N | 081 03 19 W |
| Ridgeview Cemetery | Cemetery | 222 | Lorain | 41 23 22 N | 082 01 25 W |
| Ridgeview Elementary School | School | 212 | Ashtabula | 41 52 26 N | 080 45 50 W |
| Ridgeview Middle School | School | 235 | Franklin | 40 02 47 N | 083 02 20 W |
| Ridgeview Shopping Center | Locale | 220 | Lorain | 41 22 47 N | 082 03 32 W |
| Ridgeville | Populated Place | 263 | Warren | 39 31 43 N | 084 10 37 W |
| Ridgeville Corners | Populated Place | 224 | Henry | 41 26 16 N | 084 15 27 W |
| Ridgeville Corners Post Office | Post Office | 224 | Henry | 41 26 15 N | 084 15 27 W |
| Ridgeway | Populated Place | 323 | Hardin | 40 30 50 N | 083 34 22 W |
| Ridgeway Cemetery | Cemetery | 323 | Logan | 40 31 28 N | 083 33 13 W |
| Ridgeway Cemetery | Cemetery | 246 | Pike | 39 10 32 N | 083 02 21 W |
| Ridgeway Ditch | Canal | 220 | Lorain | 41 22 50 N | 082 02 41 W |
| Ridgeway Post Office | Post Office | 323 | Hardin | 40 30 50 N | 083 34 20 W |
| Ridgeway School (historical) | School | 281 | Marion | 40 39 02 N | 083 25 11 W |
| Ridgewood (subdivision) | Populated Place | 313 | Clark | 39 57 00 N | 083 48 52 W |
| Ridgewood Acres | Populated Place | 296 | Guernsey | 40 01 08 N | 081 38 03 W |
| Ridgewood Avenue Church of Christ | Church | 180 | Lucas | 41 40 54 N | 083 30 47 W |
| Ridgewood Cemetery | Cemetery | 257 | Jackson | 39 07 33 N | 082 31 30 W |
| Ridgewood Country Club | Locale | 280 | Cuyahoga | 41 23 14 N | 081 43 59 W |
| Ridgewood Elementary School | School | 251 | Franklin | 40 02 38 N | 083 06 23 W |
| Ridgewood Golf Course | Locale | 242 | Hamilton | 39 12 24 N | 084 25 49 W |
| Ridgewood Heights | Populated Place | 296 | Montgomery | 39 44 48 N | 084 16 12 W |
| Ridgewood High School | School | 243 | Coshocton | 40 16 14 N | 081 45 15 W |
| Ridgewood Historic District | Park | 340 | Stark | 40 49 19 N | 081 21 49 W |
| Ridgewood Lake Park | Park | 272 | Cuyahoga | 41 23 10 N | 081 44 13 W |
| Ridgewood School | School | 287 | Clark | 39 57 20 N | 083 49 13 W |
| Ridgewood United Methodist Church | Church | 271 | Cuyahoga | 41 23 28 N | 081 44 06 W |
| Riding Run | Stream | | Summit | 41 12 53 N | 081 35 21 W |
| Ridpath (historical) | Populated Place | 256 | Franklin | 39 49 36 N | 083 05 25 W |
| Ridpath Post Office (historical) | Post Office | 256 | Franklin | 39 49 35 N | 083 05 25 W |
| Riegel Ridge | Ridge | 272 | Jackson | 38 56 38 N | 082 42 24 W |
| Riegert Shopping Center | Locale | 180 | Butler | 39 20 25 N | 084 33 34 W |
| Riepenhoff Hollow | Valley | | Scioto | 38 43 31 N | 082 48 45 W |
| Rieveschl Hall | Building | 231 | Hamilton | 39 08 03 N | 084 31 02 W |
| Rife Cemetery | Cemetery | 202 | Gallia | 38 54 17 N | 082 11 14 W |
| Rife Cemetery | Cemetery | 175 | Gallia | 38 57 43 N | 082 07 43 W |
| Rife Farm Cemetery | Cemetery | 213 | Pickaway | 39 37 21 N | 082 58 26 W |
| Riffle Creek | Stream | | Marion | 40 30 52 N | 083 03 23 W |
| Riggs | Populated Place | 308 | Ashtabula | 41 48 16 N | 080 32 19 W |
| Riggs Landing | Locale | 161 | Gallia | 38 42 02 N | 082 11 03 W |
| Riggs Post Office (historical) | Post Office | 309 | Ashtabula | 41 48 15 N | 080 32 19 W |
| Riggs Subdivision | Populated Place | 216 | Williams | 41 28 38 N | 084 25 34 W |
| Right Branch Cat Creek | Stream | | Washington | 39 32 45 N | 081 30 55 W |
| Right Fork Bear Creek | Stream | | Scioto | 38 47 33 N | 083 11 31 W |
| Right Fork Morgan Fork | Stream | | Pike | 39 07 33 N | 083 11 39 W |
| Right Fork Second Creek | Stream | | Warren | 39 18 19 N | 084 03 37 W |
| Right Ridge | Ridge | 270 | Lawrence | 38 30 40 N | 082 27 27 W |
| Righteous Ridge School (historical) | School | 275 | Washington | 39 31 55 N | 081 41 43 W |
| Righthand Fork Croxton Run | Stream | | Jefferson | 40 28 53 N | 080 37 04 W |
| Rightmire Hall | Building | 237 | Franklin | 40 00 11 N | 083 02 15 W |
| Rigrish Addition | Populated Place | 169 | Scioto | 38 46 41 N | 082 51 16 W |
| Rigrish Cemetery | Cemetery | 170 | Scioto | 38 47 31 N | 082 50 52 W |
| Rike Center | Building | 263 | Franklin | 40 07 47 N | 082 56 11 W |
| Rike Center for Fine Arts | Building | 243 | Montgomery | 39 44 27 N | 084 10 38 W |
| Rike Hall | Building | 288 | Greene | 39 46 59 N | 084 03 52 W |
| Riley Cemetery | Cemetery | 279 | Knox | 40 22 44 N | 082 12 04 W |
| Riley Center | Locale | 177 | Sandusky | 41 23 49 N | 083 00 43 W |
| Riley Chapel | Church | 268 | Knox | 40 22 41 N | 082 12 04 W |
| Riley Creek | Stream | | Darke | 41 00 41 N | 083 59 54 W |
| Riley Creek Cemetery | Cemetery | 274 | Hancock | 40 51 07 N | 083 46 01 W |
| Riley Creek Cemetery | Cemetery | 224 | Putnam | 40 59 36 N | 083 59 53 W |
| Riley Creek Church | Church | 276 | Hancock | 40 50 55 N | 083 47 07 W |
| Riley Creek Church | Church | 225 | Putnam | 40 59 34 N | 083 59 52 W |
| Riley Elementary School | School | 233 | Seneca | 41 10 24 N | 083 25 01 W |
| Riley Grange | Locale | 178 | Sandusky | 41 23 11 N | 082 58 22 W |
| Riley Hill | Summit | 294 | Athens | 39 20 31 N | 081 58 59 W |
| Riley Reservoir | Reservoir | 316 | Crawford | 40 49 36 N | 082 55 60 W |
| Riley Reservoir Dam | Dam | 316 | Crawford | 40 49 36 N | 082 55 60 W |
| Riley Run | Stream | | Athens | 39 21 41 N | 081 58 43 W |
| Riley Run | Stream | | Jefferson | 40 37 24 N | 080 49 23 W |
| Riley Run | Stream | | Vinton | 39 16 14 N | 082 36 21 W |
| Riley Run Bar | Bar | 191 | Belmont | 39 58 55 N | 080 44 19 W |
| Riley School (historical) | School | 232 | Vinton | 39 16 16 N | 082 34 24 W |
| Rileys Run | Stream | 246 | Warren | 39 31 25 N | 084 10 59 W |
| Rimer | Populated Place | 228 | Putnam | 40 53 04 N | 084 12 41 W |
| Rimer Elementary School | School | 305 | Summit | 41 02 01 N | 081 32 45 W |
| Rimer Post Office (historical) | Post Office | 229 | Putnam | 40 53 05 N | 084 12 40 W |
| Rinard Covered Bridge | Bridge | 196 | Washington | 39 32 13 N | 081 13 22 W |
| Rinard Mills | Populated Place | 209 | Monroe | 39 35 05 N | 081 09 18 W |
| Rinard Mills Cemetery | Cemetery | 232 | Monroe | 39 35 02 N | 081 09 24 W |
| Rinderle School | School | 188 | Erie | 41 24 02 N | 082 38 49 W |
| Rine Corners | Locale | 250 | Coshocton | 40 13 47 N | 082 09 52 W |
| Rine Hall | Building | | Hamilton | 39 06 45 N | 084 33 13 W |