Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Dumm Ridge | Ridge | 329 | Hocking | 39 28 45 N | 082 40 26 W |
| Dumontsville Cemetery | Cemetery | 302 | Fairfield | 39 46 39 N | 082 36 48 W |
| Dumontville | Populated Place | 302 | Fairfield | 39 46 38 N | 082 36 59 W |
| Dumontville Post Office (historical) | Post Office | 302 | Fairfield | 39 46 40 N | 082 36 60 W |
| Dumontville United Methodist Church | Church | 303 | Fairfield | 39 46 38 N | 082 37 01 W |
| Dumpling Hill | Summit | 343 | Fayette | 39 41 33 N | 083 36 32 W |
| Dun Ditch Number 1 | Canal | 306 | Madison | 39 57 19 N | 083 25 13 W |
| Dun Ditch Number 2 | Canal | 307 | Madison | 39 58 39 N | 083 24 46 W |
| Dun Run | Stream | | Delaware | 40 15 22 N | 083 13 20 W |
| Dunbar | Populated Place | 231 | Washington | 39 21 34 N | 081 44 30 W |
| Dunbar Elementary School | School | 361 | Summit | 41 04 49 N | 081 24 20 W |
| Dunbar Hall | Building | 358 | Portage | 41 09 04 N | 081 20 29 W |
| Dunbar Hall | Building | 207 | Wood | 41 22 31 N | 083 37 49 W |
| Dunbar Historic District | Park | 232 | Montgomery | 39 45 25 N | 084 13 08 W |
| Dunbar School (historical) | School | 211 | Henry | 41 16 08 N | 084 01 04 W |
| Dunbar Year-Round High School for Professional Studies | School | 232 | Montgomery | 39 44 06 N | 084 13 60 W |
| Dunbridge | Populated Place | 202 | Wood | 41 27 29 N | 083 36 37 W |
| Dunbridge Post Office | Post Office | 202 | Wood | 41 27 28 N | 083 36 33 W |
| Duncan Cemetery | Cemetery | 217 | Scioto | 38 52 01 N | 083 04 02 W |
| Duncan Church | Church | 288 | Miami | 39 55 25 N | 084 04 30 W |
| Duncan Falls | Populated Place | 219 | Muskingum | 39 52 19 N | 081 54 33 W |
| Duncan Falls Cemetery | Cemetery | 220 | Muskingum | 39 52 18 N | 081 54 18 W |
| Duncan Falls Junior High School | School | 218 | Muskingum | 39 52 24 N | 081 54 32 W |
| Duncan Falls Post Office | Post Office | 219 | Muskingum | 39 52 20 N | 081 54 34 W |
| Duncan Falls Primary School | School | 226 | Muskingum | 39 52 40 N | 081 54 43 W |
| Duncan Hollow | Valley | | Scioto | 38 51 52 N | 083 03 40 W |
| Duncan Hollow Creek | Stream | | Scioto | 38 51 49 N | 083 03 44 W |
| Duncan McArthur Primary School | School | 280 | Highland | 39 21 09 N | 083 23 15 W |
| Duncan Plaza Shopping Center | Locale | 288 | Stark | 40 47 44 N | 081 31 15 W |
| Duncan Run | Stream | | Delaware | 40 08 45 N | 082 51 26 W |
| Duncan Run | Stream | | Highland | 39 19 53 N | 083 23 38 W |
| Duncan Run | Stream | | Muskingum | 39 51 14 N | 081 54 02 W |
| Duncan Run School (historical) | School | 263 | Muskingum | 39 50 17 N | 081 55 24 W |
| Duncan School (historical) | School | 319 | Greene | 39 40 40 N | 083 46 14 W |
| Duncan School (historical) | School | 274 | Highland | 39 19 52 N | 083 24 27 W |
| Duncan School (historical) | School | 353 | Highland | 39 16 46 N | 083 40 40 W |
| Duncanson School (historical) | School | 294 | Highland | 39 06 10 N | 083 50 35 W |
| Duncanwood | Populated Place | 326 | Harrison | 40 11 53 N | 080 56 58 W |
| Duncanwood Post Office (historical) | Post Office | 328 | Harrison | 40 11 55 N | 080 56 59 W |
| Duncard Cemetery | Cemetery | 226 | Van Wert | 40 56 47 N | 084 30 02 W |
| Dundas | Populated Place | 231 | Vinton | 39 12 13 N | 082 28 49 W |
| Dundee | Populated Place | 314 | Tuscarawas | 40 35 12 N | 081 36 29 W |
| Dundee Cemetery | Cemetery | 329 | Tuscarawas | 40 35 31 N | 081 35 52 W |
| Dundee Creek | Stream | | Tuscarawas | 40 35 37 N | 081 36 16 W |
| Dundee Elementary School | School | 316 | Tuscarawas | 40 35 05 N | 081 36 28 W |
| Dundee Post Office | Post Office | 315 | Tuscarawas | 40 35 10 N | 081 36 29 W |
| Dunfee (historical) | Populated Place | 303 | Belmont | 39 58 15 N | 080 50 06 W |
| Dunfee Cemetery | Cemetery | 374 | Belmont | 39 58 10 N | 080 47 52 W |
| Dungan Farm Cemetery | Cemetery | 205 | Pickaway | 39 30 59 N | 083 02 17 W |
| Dungannon | Populated Place | 341 | Columbiana | 40 44 03 N | 080 52 43 W |
| Dungannon | Populated Place | 300 | Noble | 39 36 54 N | 081 34 20 W |
| Dungannon Post Office (historical) | Post Office | 344 | Columbiana | 40 44 00 N | 080 52 44 W |
| Dungeon Hollow | Valley | | Jefferson | 40 27 11 N | 080 41 01 W |
| Dunglen | Populated Place | 237 | Jefferson | 40 11 43 N | 080 47 58 W |
| Dunglen Mine Impoundment | Reservoir | 285 | Jefferson | 40 11 30 N | 080 48 29 W |
| Dunglen Mine Impoundment Dam | Dam | 285 | Jefferson | 40 11 30 N | 080 48 29 W |
| Dunglen Post Office | Post Office | 235 | Jefferson | 40 11 45 N | 080 47 59 W |
| Dungon School (historical) | School | 213 | Pickaway | 39 31 57 N | 083 02 36 W |
| Dunham | Populated Place | 198 | Washington | 39 20 05 N | 081 37 40 W |
| Dunham Cemetery | Cemetery | 289 | Brown | 39 12 17 N | 083 56 32 W |
| Dunham Cemetery | Cemetery | 196 | Washington | 39 20 13 N | 081 37 04 W |
| Dunham Christian Church | Church | 198 | Cuyahoga | 41 30 34 N | 081 38 38 W |
| Dunham Elementary School | School | 291 | Cuyahoga | 41 23 51 N | 081 34 25 W |
| Dunham Hospital | Hospital | 254 | Hamilton | 39 07 27 N | 084 35 20 W |
| Dunham Park | Park | 263 | Cuyahoga | 41 23 22 N | 081 34 44 W |
| Dunham Recreation Area | Park | 256 | Hamilton | 39 07 26 N | 084 35 23 W |
| Dunham School | School | 197 | Cuyahoga | 41 30 38 N | 081 38 38 W |
| Dunham School (historical) | School | 366 | Knox | 40 25 28 N | 082 36 45 W |
| Dunkard Cemetery | Cemetery | 342 | Highland | 39 19 08 N | 083 35 11 W |
| Dunkard Cemetery | Cemetery | 313 | Hocking | 39 36 17 N | 082 23 29 W |
| Dunkard Cemetery | Cemetery | 358 | Richland | 40 50 58 N | 082 32 33 W |
| Dunkard Cemetery | Cemetery | 339 | Richland | 40 53 08 N | 082 37 17 W |
| Dunkard Cemetery | Cemetery | 286 | Seneca | 41 04 25 N | 083 00 53 W |
| Dunkard Ridge Cemetery | Cemetery | 293 | Highland | 39 04 06 N | 083 28 09 W |
| Dunkard Ridge Church | Church | 293 | Highland | 39 04 06 N | 083 28 10 W |
| Dunker Church Cemetery | Cemetery | 262 | Montgomery | 39 49 33 N | 084 17 15 W |
| Dunkin Ditch | Canal | 308 | Madison | 39 45 28 N | 083 25 51 W |
| Dunkinsville | Populated Place | 187 | Adams | 38 51 21 N | 083 28 17 W |
| Dunkinsville Post Office (historical) | Post Office | 187 | Adams | 38 51 21 N | 083 28 17 W |
| Dunkirk | Populated Place | 288 | Hardin | 40 47 21 N | 083 38 36 W |
| Dunkirk Cemetery | Cemetery | 286 | Hardin | 40 46 35 N | 083 38 30 W |
| Dunkirk Post Office (historical) | Post Office | 288 | Hardin | 40 47 20 N | 083 38 35 W |
| Dunkle Creek | Stream | | Vinton | 39 18 48 N | 082 27 50 W |
| Dunkle Run | Stream | | Fairfield | 39 37 59 N | 082 44 36 W |
| Dunlap | Populated Place | 261 | Hamilton | 39 17 32 N | 084 37 05 W |
| Dunlap Cemetery | Cemetery | 332 | Trumbull | 41 13 23 N | 080 42 03 W |
| Dunlap Cemetery | Cemetery | 198 | Wood | 41 29 01 N | 083 43 52 W |
| Dunlap Church | Church | 201 | Scioto | 38 54 27 N | 083 16 07 W |
| Dunlap Creek | Stream | | Adams | 38 55 09 N | 083 15 02 W |
| Dunlap Creek | Stream | | Hardin | 40 38 42 N | 083 48 15 W |
| Dunlap Creek | Stream | | Tuscarawas | 40 16 24 N | 081 32 36 W |
| Dunlap King Hall | Building | 256 | Franklin | 40 07 32 N | 082 56 19 W |
| Dunlap Lake | Reservoir | 249 | Pickaway | 39 31 54 N | 083 09 60 W |
| Dunlap Lake Dam | Dam | 249 | Pickaway | 39 31 54 N | 083 09 60 W |
| Dunlap Memorial Hospital | Hospital | 345 | Wayne | 40 49 55 N | 081 45 49 W |
| Dunlap Pond Dam Number One | Dam | 234 | Pickaway | 39 37 30 N | 083 07 54 W |
| Dunlap Pond Dam Number Three | Dam | 247 | Pickaway | 39 37 00 N | 083 09 54 W |
| Dunlap Pond Dam Number Two | Dam | 247 | Pickaway | 39 36 48 N | 083 10 36 W |
| Dunlap Pond Number One | Reservoir | 234 | Pickaway | 39 37 30 N | 083 07 54 W |
| Dunlap Pond Number Three | Reservoir | 247 | Pickaway | 39 37 00 N | 083 09 54 W |
| Dunlap Pond Number Two | Reservoir | 247 | Pickaway | 39 36 48 N | 083 10 36 W |
| Dunlap Post Office (historical) | Post Office | 257 | Hamilton | 39 17 30 N | 084 37 05 W |
| Dunlap Run | Stream | | Hamilton | 39 17 20 N | 084 39 10 W |
| Dunlap School (historical) | School | 322 | Carroll | 40 38 00 N | 081 06 28 W |
| Dunlap School (historical) | School | 239 | Pickaway | 39 37 10 N | 083 08 26 W |
| Dunlap School (historical) | School | 198 | Ross | 39 24 17 N | 083 00 49 W |
| Dunlap School (historical) | School | 200 | Scioto | 38 54 28 N | 083 16 05 W |
| Dunloe Elementary School | School | 230 | Franklin | 39 54 40 N | 082 51 29 W |
| Dunlop Hollow | Valley | | Scioto | 38 45 52 N | 082 55 23 W |
| Dunlovy School | School | 229 | Warren | 39 26 28 N | 084 12 37 W |