Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Deeming School | School | 282 | Ashtabula | 41 34 56 N | 080 47 02 W |
| Deems (historical) | Populated Place | 268 | Franklin | 39 57 15 N | 083 06 60 W |
| Deep Cut | Channel | 259 | Allen | 40 41 11 N | 084 21 55 W |
| Deep Cut | Channel | 279 | Fairfield | 39 53 13 N | 082 32 24 W |
| Deep Cut School (historical) | School | 261 | Auglaize | 40 40 55 N | 084 22 05 W |
| Deep Cut School (historical) | School | 314 | Guernsey | 40 02 09 N | 081 28 44 W |
| Deep Ford (historical) | Crossing | 263 | Butler | 39 33 47 N | 084 44 19 W |
| Deep Lock (historical) | Dam | 266 | Summit | 41 14 00 N | 081 33 34 W |
| Deep Run | Stream | | Adams | 38 49 55 N | 083 19 50 W |
| Deep Run | Stream | | Belmont | 40 09 01 N | 080 42 24 W |
| Deep Run | Stream | | Delaware | 40 10 05 N | 083 02 29 W |
| Deep Springs Cemetery | Cemetery | 283 | Carroll | 40 33 27 N | 081 15 15 W |
| Deeper Life Church of Christ | Church | 293 | Hardin | 40 38 31 N | 083 36 50 W |
| Deepwater Marina | Locale | 174 | Erie | 41 27 24 N | 082 43 07 W |
| Deer Creek | Stream | | Champaign | 40 02 16 N | 083 54 07 W |
| Deer Creek | Stream | | Fulton | 41 38 40 N | 084 16 05 W |
| Deer Creek | Stream | | Fulton | 41 40 21 N | 084 18 44 W |
| Deer Creek | Stream | | Gallia | 38 57 21 N | 082 21 11 W |
| Deer Creek | Stream | | Portage | 40 58 48 N | 081 08 28 W |
| Deer Creek | Stream | | Putnam | 41 02 26 N | 084 13 08 W |
| Deer Creek | Stream | | Ross | 39 27 23 N | 083 00 07 W |
| Deer Creek Common | Park | 186 | Hamilton | 39 06 52 N | 084 30 03 W |
| Deer Creek Golf Course | Locale | 290 | Trumbull | 41 10 08 N | 080 32 33 W |
| Deer Creek Hollow | Valley | | Gallia | 38 44 10 N | 082 23 16 W |
| Deer Creek Lake | Reservoir | 240 | Pickaway | 39 37 27 N | 083 12 60 W |
| Deer Creek Meeting House (historical) | Church | 352 | Stark | 40 59 16 N | 081 10 18 W |
| Deer Creek Park | Park | 316 | Stark | 40 58 29 N | 081 07 17 W |
| Deer Creek Reservoir | Reservoir | 313 | Stark | 40 58 06 N | 081 06 59 W |
| Deer Creek Reservoir Dam | Dam | 313 | Stark | 40 58 06 N | 081 06 59 W |
| Deer Creek Township School | School | 336 | Madison | 39 56 05 N | 083 29 29 W |
| Deer Creek Village (historical) | Populated Place | 330 | Madison | 39 58 08 N | 083 28 40 W |
| Deer Hollow Trail | Trail | 191 | Gallia | 38 47 35 N | 082 21 43 W |
| Deer Lake Golf Course | Locale | 182 | Ashtabula | 41 50 55 N | 080 58 53 W |
| Deer Lick (historical) | Populated Place | 265 | Williams | 41 37 03 N | 084 34 28 W |
| Deer Lick Farm (historical) | Locale | 278 | Licking | 40 04 43 N | 082 21 02 W |
| Deer Lick Knob | Summit | 341 | Adams | 38 52 57 N | 083 23 02 W |
| Deer Lick School (historical) | School | 266 | Williams | 41 37 46 N | 084 33 32 W |
| Deer Loop Trail | Trail | 271 | Highland | 39 11 22 N | 083 31 33 W |
| Deer Park | Populated Place | 265 | Hamilton | 39 12 19 N | 084 23 41 W |
| Deer Park Baptist Church | Church | 262 | Hamilton | 39 12 30 N | 084 23 41 W |
| Deer Park Baptist Heritage School | School | 262 | Hamilton | 39 12 30 N | 084 23 41 W |
| Deer Park High School | School | 258 | Hamilton | 39 12 38 N | 084 23 59 W |
| Deer Park Municipal Building | Building | 265 | Hamilton | 39 12 18 N | 084 23 40 W |
| Deer Park Post Office (historical) | Post Office | 265 | Hamilton | 39 12 20 N | 084 23 40 W |
| Deer Pen Picnic Area | Locale | 268 | Preble | 39 34 44 N | 084 45 31 W |
| Deer Run | Stream | | Delaware | 40 08 35 N | 083 07 17 W |
| Deer Run Country Club | Locale | 250 | Hamilton | 39 08 19 N | 084 41 57 W |
| Deercreek Dam | Dam | 240 | Pickaway | 39 37 27 N | 083 12 60 W |
| Deercreek Elementary School | School | 308 | Madison | 39 56 17 N | 083 24 22 W |
| Deerfield | Populated Place | 328 | Portage | 41 01 28 N | 081 03 00 W |
| Deerfield Cemetery | Cemetery | 277 | Morgan | 39 39 51 N | 081 57 15 W |
| Deerfield Cemetery | Cemetery | 321 | Portage | 41 01 34 N | 081 02 03 W |
| Deerfield Cemetery | Cemetery | 227 | Warren | 39 22 26 N | 084 12 19 W |
| Deerfield Industrial Park | Locale | 259 | Hamilton | 39 15 54 N | 084 21 35 W |
| Deerfield Post Office | Post Office | 328 | Portage | 41 01 28 N | 081 03 00 W |
| Deerfield Presbyterian Church | Church | 276 | Morgan | 39 39 51 N | 081 57 17 W |
| Deerfield Station (historical) | Locale | 318 | Portage | 41 01 28 N | 081 01 17 W |
| Deering | Populated Place | 218 | Lawrence | 38 30 12 N | 082 34 60 W |
| Deersville | Populated Place | 376 | Harrison | 40 18 27 N | 081 11 11 W |
| Deersville Bay | Bay | 270 | Harrison | 40 15 45 N | 081 11 34 W |
| Deersville Cemetery | Cemetery | 360 | Harrison | 40 18 30 N | 081 09 46 W |
| Deersville Methodist Episcopal Cemetery | Cemetery | 378 | Harrison | 40 18 31 N | 081 11 30 W |
| Deersville Post Office | Post Office | 378 | Harrison | 40 18 25 N | 081 11 09 W |
| Deeter Cemetery | Cemetery | 293 | Miami | 40 07 12 N | 084 23 47 W |
| Deetz School (historical) | School | 330 | Holmes | 40 30 47 N | 081 50 09 W |
| Defense Construction Supply Center | Locale | 242 | Franklin | 39 58 46 N | 082 53 50 W |
| Deffenbaugh Park | Park | 251 | Fairfield | 39 43 12 N | 082 34 38 W |
| Defiance | Populated Place | 206 | Defiance | 41 17 04 N | 084 21 21 W |
| Defiance Church of the Brethren | Church | 206 | Defiance | 41 17 04 N | 084 21 31 W |
| Defiance Church of the Nazarene | Church | 217 | Defiance | 41 15 52 N | 084 22 11 W |
| Defiance College | School | 218 | Defiance | 41 17 47 N | 084 21 34 W |
| Defiance County | Civil | 216 | Defiance | 41 20 00 N | 084 27 00 W |
| Defiance County Children Home Cemetery | Cemetery | 212 | Defiance | 41 20 45 N | 084 25 17 W |
| Defiance County Childrens Home | Building | 218 | Defiance | 41 16 59 N | 084 20 16 W |
| Defiance County Courthouse | Building | 209 | Defiance | 41 17 12 N | 084 21 42 W |
| Defiance County Fairgrounds | Park | 228 | Defiance | 41 17 24 N | 084 45 21 W |
| Defiance County Home | Building | 213 | Defiance | 41 20 32 N | 084 25 01 W |
| Defiance County Home Cemetery | Cemetery | 214 | Defiance | 41 20 25 N | 084 25 18 W |
| Defiance Hall | Building | 218 | Defiance | 41 17 46 N | 084 21 36 W |
| Defiance High School | School | 216 | Defiance | 41 15 49 N | 084 21 36 W |
| Defiance Hospital | Hospital | 211 | Defiance | 41 17 03 N | 084 20 29 W |
| Defiance Junior High School | School | 213 | Defiance | 41 16 52 N | 084 21 56 W |
| Defiance Memorial Airport | Airport | 212 | Defiance | 41 20 14 N | 084 25 43 W |
| Defiance Post Office | Post Office | 209 | Defiance | 41 17 11 N | 084 21 38 W |
| Defiance Public Library | Building | 205 | Defiance | 41 17 15 N | 084 21 28 W |
| Defiance Reservoir | Reservoir | 202 | Defiance | 41 14 18 N | 084 23 60 W |
| Defiance Seventh Day Adventist Church | Church | 213 | Defiance | 41 16 57 N | 084 20 34 W |
| DeForest | Populated Place | 288 | Trumbull | 41 12 10 N | 080 46 46 W |
| DeForest Junction | Populated Place | 278 | Trumbull | 41 12 19 N | 080 47 26 W |
| Deforest Post Office (historical) | Post Office | 287 | Trumbull | 41 12 10 N | 080 46 44 W |
| Degenhart Museum | Building | 304 | Guernsey | 40 02 57 N | 081 34 00 W |
| Deigle School (historical) | School | 210 | Henry | 41 17 50 N | 084 05 45 W |
| Deitsch School (historical) | School | 252 | Mercer | 40 37 34 N | 084 44 50 W |
| Deitz Cemetery | Cemetery | 311 | Tuscarawas | 40 29 30 N | 081 36 39 W |
| Dekalb | Populated Place | 329 | Crawford | 40 53 33 N | 082 46 22 W |
| Del-Fair Shopping Center | Locale | 258 | Hamilton | 39 05 37 N | 084 37 03 W |
| Dela Pama Fishing Lake | Reservoir | 256 | Clermont | 39 03 30 N | 084 02 36 W |
| Dela Pama Fishing Lake Dam | Dam | 256 | Clermont | 39 03 30 N | 084 02 36 W |
| Delaney Hollow | Valley | | Scioto | 38 44 02 N | 082 43 03 W |
| Delaney School (historical) | School | 299 | Noble | 39 38 34 N | 081 33 45 W |
| Delaney-Tewksbury Baseball Diamond | Park | 314 | Clinton | 39 26 22 N | 083 49 02 W |
| Delano | Populated Place | 213 | Ross | 39 24 25 N | 082 57 20 W |
| Delano Run | Stream | | Knox | 40 22 19 N | 082 27 52 W |
| Delason Park | Park | 324 | Mahoning | 41 04 57 N | 080 39 40 W |
| Delawanda Park | Park | 225 | Franklin | 40 04 00 N | 083 01 49 W |
| Delaware | Populated Place | 265 | Delaware | 40 17 55 N | 083 04 05 W |
| Delaware Avenue United Methodist Church | Church | 178 | Lorain | 41 28 20 N | 082 10 06 W |
| Delaware Christian School | School | 275 | Delaware | 40 16 51 N | 083 04 16 W |
| Delaware City Hall | Building | 265 | Delaware | 40 17 54 N | 083 04 04 W |
| Delaware Country Club | Locale | 278 | Delaware | 40 14 55 N | 083 03 05 W |