Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Mallow School (historical) | School | 256 | Ross | 39 28 51 N | 083 13 42 W |
| Mallow-Perrill Cemetery | Cemetery | 313 | Fayette | 39 32 15 N | 083 33 60 W |
| Malloy Hollow | Valley | | Lawrence | 38 38 07 N | 082 44 54 W |
| Malone Cemetery | Cemetery | 195 | Ross | 39 17 02 N | 082 58 05 W |
| Malone Cemetery | Cemetery | 197 | Scioto | 38 45 17 N | 083 02 14 W |
| Malone College | School | 356 | Stark | 40 49 29 N | 081 22 33 W |
| Malone Hollow | Valley | | Lawrence | 38 42 54 N | 082 38 47 W |
| Maloney Park | Park | 258 | Franklin | 39 59 59 N | 082 57 59 W |
| Malour School (historical) | School | 256 | Ross | 39 17 17 N | 082 59 30 W |
| Malta | Populated Place | 206 | Morgan | 39 38 57 N | 081 51 43 W |
| Malta Cemetery | Cemetery | 289 | Morgan | 39 38 32 N | 081 51 41 W |
| Malta Elementary School | School | 207 | Morgan | 39 39 12 N | 081 51 56 W |
| Malta Methodist Church (historical) | Church | 206 | Morgan | 39 38 54 N | 081 51 39 W |
| Malta Post Office | Post Office | 208 | Morgan | 39 38 51 N | 081 51 36 W |
| Maltby Cemetery | Cemetery | 265 | Trumbull | 41 20 27 N | 080 56 00 W |
| Malvern | Populated Place | 303 | Carroll | 40 41 30 N | 081 10 52 W |
| Malvern Elementary School | School | 303 | Carroll | 40 41 33 N | 081 11 06 W |
| Malvern High School | School | 303 | Carroll | 40 41 33 N | 081 11 08 W |
| Malvern Post Office | Post Office | 302 | Carroll | 40 41 30 N | 081 10 54 W |
| Malvern School (historical) | School | 319 | Cuyahoga | 41 28 36 N | 081 32 25 W |
| Mammal Cemetery | Cemetery | 335 | Clark | 40 00 27 N | 083 58 48 W |
| Mamre Cemetery | Cemetery | 270 | Lawrence | 38 33 45 N | 082 34 56 W |
| Mamre Church | Church | 272 | Lawrence | 38 33 37 N | 082 34 45 W |
| Man in Christ Ministries | Church | 260 | Franklin | 40 00 39 N | 082 58 10 W |
| Manairco Heliport | Airport | 387 | Richland | 40 48 17 N | 082 30 41 W |
| Manakiki Country Club | Locale | 231 | Lake | 41 35 53 N | 081 25 55 W |
| Manara | Populated Place | 274 | Fayette | 39 36 09 N | 083 18 47 W |
| Manara School (historical) | School | 274 | Fayette | 39 36 06 N | 083 18 44 W |
| Manchester | Populated Place | 154 | Adams | 38 41 17 N | 083 36 34 W |
| Manchester | Populated Place | 334 | Summit | 40 56 13 N | 081 34 09 W |
| Manchester Baptist Church | Church | 298 | Noble | 39 43 00 N | 081 37 20 W |
| Manchester Boat Launch Ramp | Locale | 154 | Adams | 38 41 12 N | 083 36 40 W |
| Manchester Bridge | Bridge | 243 | Noble | 39 42 58 N | 081 36 59 W |
| Manchester Cemetery | Cemetery | 371 | Adams | 38 43 31 N | 083 21 32 W |
| Manchester Cemetery | Cemetery | 299 | Noble | 39 42 59 N | 081 37 20 W |
| Manchester Cemetery | Cemetery | 326 | Summit | 40 56 07 N | 081 34 14 W |
| Manchester City Hall | Building | 154 | Adams | 38 41 17 N | 083 36 33 W |
| Manchester Elementary School | School | 214 | Lake | 41 46 12 N | 081 07 58 W |
| Manchester Hall | Building | 347 | Portage | 41 08 51 N | 081 20 25 W |
| Manchester High School | School | 167 | Adams | 38 41 36 N | 083 36 30 W |
| Manchester High School | School | 345 | Summit | 40 56 28 N | 081 33 02 W |
| Manchester Junior High School | School | 265 | Butler | 39 31 26 N | 084 21 01 W |
| Manchester Middle School | School | 343 | Summit | 40 56 24 N | 081 34 02 W |
| Manchester Post Office | Post Office | 154 | Adams | 38 41 17 N | 083 36 35 W |
| Manchester School (historical) | School | 315 | Auglaize | 40 33 12 N | 083 53 53 W |
| Manchester Second Street Cemetery | Cemetery | 153 | Adams | 38 41 19 N | 083 36 13 W |
| Mandale | Populated Place | 219 | Paulding | 41 01 05 N | 084 21 36 W |
| Mandale Church of Christ in Christian Union | Church | 219 | Paulding | 41 01 01 N | 084 21 32 W |
| Mandale Post Office (historical) | Post Office | 219 | Paulding | 41 01 05 N | 084 21 35 W |
| Mandel School of Applied Social Science | School | 208 | Cuyahoga | 41 30 38 N | 081 36 27 W |
| Manera Post Office (historical) | Post Office | 274 | Fayette | 39 36 10 N | 083 18 45 W |
| Manfull Airport | Airport | 380 | Carroll | 40 38 53 N | 081 04 07 W |
| Manfull Church | Church | 384 | Carroll | 40 41 15 N | 081 01 15 W |
| Manfull Lake | Reservoir | 347 | Columbiana | 40 44 00 N | 080 56 35 W |
| Manfull Lake Dam | Dam | 347 | Columbiana | 40 44 00 N | 080 56 35 W |
| Manhattan Beach | Populated Place | 182 | Cuyahoga | 41 34 30 N | 081 34 36 W |
| Manhattan Plaza Shopping Center | Locale | 183 | Lucas | 41 41 14 N | 083 31 55 W |
| Manila Bay | Bay | 174 | Ottawa | 41 42 45 N | 082 50 02 W |
| Manila School (historical) | School | 261 | Clermont | 39 12 57 N | 084 08 01 W |
| Manker (historical) | Populated Place | 186 | Lawrence | 38 35 21 N | 082 30 46 W |
| Manker Post Office (historical) | Post Office | 195 | Lawrence | 38 35 20 N | 082 30 45 W |
| Manley Cemetery | Cemetery | 343 | Wayne | 40 41 51 N | 082 03 13 W |
| Manley School (historical) | School | 246 | Mercer | 40 41 03 N | 084 42 33 W |
| Manleys Subdivision | Populated Place | 268 | Williams | 41 36 07 N | 084 33 20 W |
| Manlove Run | Stream | | Hardin | 40 37 32 N | 083 35 29 W |
| Manly United Methodist Church | Church | 174 | Scioto | 38 45 08 N | 082 58 29 W |
| Mann | Populated Place | 297 | Ashtabula | 41 35 30 N | 080 38 20 W |
| Mann Cemetery | Cemetery | 256 | Lawrence | 38 32 05 N | 082 24 11 W |
| Mann Cemetery | Cemetery | 347 | Monroe | 39 39 19 N | 081 09 00 W |
| Mann Cemetery | Cemetery | 261 | Wyandot | 40 50 39 N | 083 23 56 W |
| Mann Junior High School | School | 198 | Cuyahoga | 41 29 21 N | 081 49 23 W |
| Manning Hall | Building | 326 | Knox | 40 22 16 N | 082 23 51 W |
| Manning Run | Stream | | Shelby | 40 19 00 N | 084 06 42 W |
| Mannings Pond | Lake | 295 | Summit | 41 03 47 N | 081 32 52 W |
| Mannon Run | Stream | | Guernsey | 39 53 24 N | 081 38 57 W |
| Manns Fork Salt Creek | Stream | | Muskingum | 39 52 41 N | 081 53 09 W |
| Manns Run | Stream | | Morgan | 39 35 22 N | 081 47 13 W |
| Manor (historical) | Populated Place | 301 | Montgomery | 39 35 22 N | 084 08 35 W |
| Manor Avenue Elementary School | School | 307 | Mahoning | 41 02 34 N | 080 36 00 W |
| Manor Park | Park | 304 | Montgomery | 39 40 14 N | 084 08 25 W |
| Manpower Park | Park | 200 | Jackson | 39 02 47 N | 082 37 54 W |
| Manry Park | Park | 192 | Lake | 41 37 42 N | 081 28 09 W |
| Mans Fork | Stream | | Morgan | 39 41 07 N | 081 45 09 W |
| Mansfield | Populated Place | 379 | Richland | 40 45 30 N | 082 30 56 W |
| Mansfield Baptist Temple | Church | 408 | Richland | 40 46 42 N | 082 28 28 W |
| Mansfield Bible Church | Church | 418 | Richland | 40 44 42 N | 082 31 15 W |
| Mansfield Cemetery | Cemetery | 230 | Athens | 39 16 54 N | 082 02 36 W |
| Mansfield Cemetery | Cemetery | 233 | Athens | 39 20 07 N | 082 02 47 W |
| Mansfield Cemetery | Cemetery | 216 | Defiance | 41 11 00 N | 084 19 26 W |
| Mansfield Christian School | School | 425 | Richland | 40 43 19 N | 082 31 49 W |
| Mansfield City Cemetery | Cemetery | 402 | Richland | 40 44 40 N | 082 30 40 W |
| Mansfield CPC Heliport | Airport | 426 | Richland | 40 46 24 N | 082 36 07 W |
| Mansfield Ditch | Canal | 227 | Paulding | 41 07 12 N | 084 47 04 W |
| Mansfield Freewill Baptist Church | Church | 402 | Richland | 40 46 54 N | 082 26 47 W |
| Mansfield General Hospital | Hospital | 406 | Richland | 40 45 08 N | 082 31 42 W |
| Mansfield General Hospital Heliport | Airport | 406 | Richland | 40 45 09 N | 082 31 42 W |
| Mansfield High School | School | 386 | Richland | 40 45 46 N | 082 32 30 W |
| Mansfield Hollow | Valley | | Scioto | 38 47 29 N | 082 51 19 W |
| Mansfield Lahm Municipal Airport | Airport | 394 | Richland | 40 49 16 N | 082 30 60 W |
| Mansfield Memorial Park | Cemetery | 420 | Richland | 40 45 27 N | 082 36 19 W |
| Mansfield Post Office | Post Office | 373 | Richland | 40 45 38 N | 082 31 04 W |
| Mansfield Raceway | Locale | 392 | Richland | 40 48 40 N | 082 29 43 W |
| Mansfield Waterworks | Locale | 374 | Richland | 40 42 12 N | 082 34 57 W |
| Mantua | Populated Place | 315 | Guernsey | 40 04 40 N | 081 40 44 W |
| Mantua | Populated Place | 350 | Portage | 41 17 02 N | 081 13 26 W |
| Mantua Center | Populated Place | 356 | Portage | 41 18 35 N | 081 14 41 W |
| Mantua Center Elementary School | School | 357 | Portage | 41 18 40 N | 081 14 42 W |
| Mantua Center Historic District | Park | 356 | Portage | 41 18 35 N | 081 14 41 W |
| Mantua Corners | Populated Place | 365 | Portage | 41 18 37 N | 081 13 16 W |
| Mantua Post Office | Post Office | 347 | Portage | 41 17 00 N | 081 13 24 W |