Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Lynn Park | Park | 283 | Trumbull | 41 13 22 N | 080 47 24 W |
| Lynn Street School (historical) | School | 345 | Mahoning | 41 02 59 N | 080 44 14 W |
| Lynn Valley School (historical) | School | 306 | Hardin | 40 37 45 N | 083 40 59 W |
| Lynns Corners | Populated Place | 348 | Mahoning | 41 02 33 N | 080 44 13 W |
| Lynnview | Populated Place | 243 | Hamilton | 39 14 10 N | 084 33 25 W |
| Lynx | Populated Place | 249 | Adams | 38 46 23 N | 083 24 47 W |
| Lynx Post Office | Post Office | 244 | Adams | 38 46 23 N | 083 24 23 W |
| Lyon Plat Elementary School | School | 303 | Mahoning | 41 03 26 N | 080 36 34 W |
| Lyon Ridge | Ridge | 258 | Brown | 38 48 07 N | 083 55 59 W |
| Lyon Run | Stream | | Brown | 38 48 40 N | 083 55 48 W |
| Lyon School (historical) | School | 312 | Muskingum | 39 49 54 N | 081 47 23 W |
| Lyons | Populated Place | 234 | Fulton | 41 41 58 N | 084 04 13 W |
| Lyons Cemetery | Cemetery | 357 | Champaign | 40 09 19 N | 083 57 06 W |
| Lyons Cemetery | Cemetery | 236 | Fulton | 41 41 53 N | 084 04 37 W |
| Lyons Cemetery | Cemetery | 191 | Wood | 41 31 14 N | 083 42 13 W |
| Lyons Christian Church | Church | 234 | Fulton | 41 41 57 N | 084 04 10 W |
| Lyons Corporate Center | Locale | 268 | Hamilton | 39 14 20 N | 084 23 30 W |
| Lyons Den Golf Course | Locale | 347 | Stark | 40 52 37 N | 081 36 33 W |
| Lyons Elementary School | School | 236 | Fulton | 41 42 12 N | 084 04 13 W |
| Lyons Post Office | Post Office | 235 | Fulton | 41 42 00 N | 084 04 15 W |
| Lyons School (historical) | School | 315 | Darke | 40 14 09 N | 084 36 07 W |
| Lyonsdale (historical) | Populated Place | 265 | Perry | 39 43 58 N | 082 08 15 W |
| Lyonsdale Post Office (historical) | Post Office | 265 | Perry | 39 44 00 N | 082 08 15 W |
| Lyra | Populated Place | 205 | Scioto | 38 44 18 N | 082 44 16 W |
| Lyra Post Office (historical) | Post Office | 195 | Scioto | 38 44 20 N | 082 44 15 W |
| Lysander | Populated Place | 242 | Athens | 39 17 06 N | 082 02 45 W |
| Lysander Post Office (historical) | Post Office | 243 | Athens | 39 17 05 N | 082 02 45 W |
| Lytle | Populated Place | 314 | Warren | 39 33 39 N | 084 08 06 W |
| Lytle Cemetery | Cemetery | 307 | Warren | 39 33 37 N | 084 07 48 W |
| Lytle Creek | Stream | | Clinton | 39 25 30 N | 083 57 02 W |
| Lytle Ditch | Canal | 196 | Lucas | 41 30 24 N | 083 46 24 W |
| Lytle Methodist Church | Church | 308 | Warren | 39 33 37 N | 084 07 49 W |
| Lytle Park | Park | 166 | Hamilton | 39 06 07 N | 084 30 18 W |
| Lytle Park | Park | 151 | Hamilton | 39 10 04 N | 084 30 16 W |
| Lytle Park Historic District | Park | 165 | Hamilton | 39 06 04 N | 084 30 17 W |
| Lytles Creek Cemetery | Cemetery | 318 | Clinton | 39 26 27 N | 083 53 32 W |
| Lytlesburg Cemetery | Cemetery | 346 | Muskingum | 39 46 47 N | 081 44 47 W |
| Lytlesburg Methodist Church | Church | 345 | Muskingum | 39 46 46 N | 081 44 48 W |
| Lyttle Airport | Airport | 322 | Franklin | 40 02 58 N | 082 47 18 W |
| Lytton | Populated Place | 228 | Fulton | 41 39 26 N | 083 57 19 W |
| Lytton Post Office (historical) | Post Office | 228 | Fulton | 41 39 25 N | 083 57 20 W |
| Lytton Zion United Church of Christ | Church | 229 | Fulton | 41 39 20 N | 083 57 19 W |
| M and M Heliport | Airport | 293 | Tuscarawas | 40 38 33 N | 081 21 19 W |
| M C J V s Airport | Airport | 287 | Montgomery | 39 50 36 N | 084 19 53 W |
| M C R Airport | Airport | 344 | Medina | 41 03 43 N | 081 58 43 W |
| M L King Junior Park | Park | 218 | Hamilton | 39 09 04 N | 084 29 08 W |
| M P W Heliport | Airport | 280 | Licking | 39 57 16 N | 082 31 39 W |
| Ma-chri-ka-be Lake | Lake | 240 | Wyandot | 40 53 08 N | 083 13 48 W |
| Mabee Cemetery | Cemetery | 214 | Jackson | 38 54 36 N | 082 44 20 W |
| Mabee Corner | Populated Place | 196 | Jackson | 38 54 10 N | 082 43 16 W |
| Mabel Hartzel Museum | Building | 324 | Stark | 40 55 48 N | 081 06 16 W |
| Mabert Hollow | Valley | | Scioto | 38 44 30 N | 082 57 56 W |
| Mabert Road Baptist Church | Church | 163 | Scioto | 38 44 29 N | 082 57 55 W |
| Mable Schnee Middle School | School | 341 | Portage | 41 06 07 N | 081 14 27 W |
| Mac-o-chee Post Office (historical) | Post Office | 341 | Logan | 40 15 30 N | 083 42 60 W |
| Maca Park | Park | 347 | Summit | 41 05 36 N | 081 24 18 W |
| Macacheek Castle | Locale | 342 | Logan | 40 15 03 N | 083 43 36 W |
| MacAdam (historical) | Populated Place | 247 | Van Wert | 40 46 17 N | 084 33 07 W |
| MacArthur Park (subdivision) | Populated Place | 181 | Erie | 41 26 07 N | 082 43 20 W |
| MacCracken Hall | Building | 268 | Butler | 39 30 14 N | 084 44 05 W |
| Mace Cemetery | Cemetery | 237 | Vinton | 39 09 55 N | 082 19 45 W |
| Mace Hollow | Valley | | Hocking | 39 22 15 N | 082 43 44 W |
| Macedoina Church | Church | 217 | Gallia | 38 43 49 N | 082 17 22 W |
| Macedon | Populated Place | 276 | Mercer | 40 28 46 N | 084 45 09 W |
| Macedon Cemetery | Cemetery | 277 | Mercer | 40 28 46 N | 084 45 32 W |
| Macedon Post Office (historical) | Post Office | 275 | Mercer | 40 28 45 N | 084 45 10 W |
| Macedonia | Populated Place | 267 | Butler | 39 20 55 N | 084 47 45 W |
| Macedonia | Populated Place | 301 | Summit | 41 18 49 N | 081 30 30 W |
| Macedonia Baptist Church | Church | 241 | Franklin | 39 57 21 N | 082 58 04 W |
| Macedonia Baptist Church | Church | 269 | Guernsey | 40 01 37 N | 081 35 04 W |
| Macedonia Baptist Church | Church | 182 | Lucas | 41 40 23 N | 083 34 47 W |
| Macedonia Baptist Church | Church | 267 | Montgomery | 39 44 59 N | 084 15 13 W |
| Macedonia Baptist Church | Church | 343 | Summit | 41 03 22 N | 081 29 42 W |
| Macedonia Baptist Church of Avondale | Church | 208 | Hamilton | 39 08 53 N | 084 30 22 W |
| Macedonia Cemetery | Cemetery | 269 | Butler | 39 20 56 N | 084 47 47 W |
| Macedonia Cemetery | Cemetery | 346 | Carroll | 40 37 18 N | 081 11 57 W |
| Macedonia Cemetery | Cemetery | 220 | Gallia | 38 43 52 N | 082 17 22 W |
| Macedonia Cemetery | Cemetery | 260 | Lawrence | 38 26 29 N | 082 31 28 W |
| Macedonia Cemetery | Cemetery | 283 | Lawrence | 38 43 53 N | 082 34 39 W |
| Macedonia Christian Church | Church | 267 | Butler | 39 20 55 N | 084 47 45 W |
| Macedonia Church | Church | 306 | Clinton | 39 19 45 N | 083 51 30 W |
| Macedonia Church | Church | 281 | Lawrence | 38 43 53 N | 082 34 38 W |
| Macedonia Church | Church | 227 | Vinton | 39 21 00 N | 082 37 39 W |
| Macedonia Church (historical) | Church | 315 | Carroll | 40 37 18 N | 081 12 04 W |
| Macedonia Primitive Baptist Church | Church | 162 | Hamilton | 39 09 18 N | 084 24 16 W |
| Macedonia School | School | 280 | Lawrence | 38 26 18 N | 082 31 43 W |
| Macedonia School (historical) | School | 259 | Clermont | 38 59 10 N | 084 05 59 W |
| Macedonia United Brethren Church | Church | 247 | Muskingum | 39 59 49 N | 082 08 29 W |
| Machamer Cemetery | Cemetery | 360 | Stark | 40 56 45 N | 081 20 50 W |
| Mack | Populated Place | 276 | Hamilton | 39 09 29 N | 084 38 59 W |
| Mack Ditch | Canal | 222 | Putnam | 41 03 04 N | 084 03 40 W |
| Mack Hall | Building | 229 | Franklin | 39 59 45 N | 083 00 52 W |
| Mack Memorial Church of the Brethren | Church | 269 | Montgomery | 39 46 50 N | 084 13 19 W |
| Mack Post Office (historical) | Post Office | 272 | Hamilton | 39 09 30 N | 084 38 60 W |
| Mackachack (historical) | Populated Place | 342 | Logan | 40 14 58 N | 083 43 40 W |
| Mackenzie Run | Stream | | Adams | 38 43 08 N | 083 27 01 W |
| Mackey Elementary School | School | 202 | Belmont | 40 06 28 N | 080 42 36 W |
| Mackinnon Hall | Building | 191 | Athens | 39 19 27 N | 082 05 42 W |
| MacKinnon Hall | Building | 183 | Lucas | 41 39 41 N | 083 37 01 W |
| Mackletree Mission | Church | 225 | Scioto | 38 43 03 N | 083 11 43 W |
| Mackletree Tree | Stream | | Scioto | 38 43 38 N | 083 10 37 W |
| Mackley Cemetery | Cemetery | 248 | Jackson | 38 53 21 N | 082 35 21 W |
| Mackley Run | Stream | | Jackson | 38 53 11 N | 082 36 26 W |
| Macks Heliport | Airport | 233 | Putnam | 40 55 41 N | 084 03 28 W |
| Macksburg | Populated Place | 214 | Washington | 39 37 56 N | 081 27 23 W |
| Macksburg Cemetery | Cemetery | 287 | Washington | 39 38 20 N | 081 27 22 W |
| Macksburg Elementary School (historical) | School | 214 | Washington | 39 37 53 N | 081 27 15 W |
| Mackstown | Populated Place | 277 | Delaware | 40 08 42 N | 082 52 58 W |
| MacMillan Hall | Building | 276 | Butler | 39 30 25 N | 084 44 03 W |
| Macochee Castle | Populated Place | 341 | Logan | 40 15 29 N | 083 43 01 W |