Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Marlboro | Populated Place | 357 | Stark | 40 57 04 N | 081 12 50 W |
| Marlboro Cemetery | Cemetery | 290 | Delaware | 40 22 02 N | 083 01 49 W |
| Marlboro Cemetery | Cemetery | 341 | Stark | 40 57 52 N | 081 12 52 W |
| Marlboro Church | Church | 289 | Delaware | 40 22 00 N | 083 01 52 W |
| Marlboro Church (historical) | Church | 280 | Delaware | 40 23 45 N | 083 02 43 W |
| Marlboro High School | School | 361 | Stark | 40 57 09 N | 081 14 35 W |
| Marlboro Post Office (historical) | Post Office | 356 | Stark | 40 57 05 N | 081 12 49 W |
| Marlborough Park | Park | 253 | Cuyahoga | 41 24 56 N | 081 44 36 W |
| Marlington High School | School | 344 | Stark | 40 55 22 N | 081 10 51 W |
| Marlington Middle School | School | 349 | Stark | 40 55 16 N | 081 11 01 W |
| Marmarosher Jewish Center | Building | 256 | Cuyahoga | 41 30 31 N | 081 34 56 W |
| Marmon Valley | Valley | | Logan | 40 19 35 N | 083 40 33 W |
| Marmon Valley Cemetery | Cemetery | 376 | Logan | 40 19 09 N | 083 38 03 W |
| Marmon Valley School (historical) | School | 376 | Logan | 40 19 09 N | 083 38 03 W |
| Marne | Populated Place | 250 | Licking | 40 04 16 N | 082 18 34 W |
| Marne United Methodist Church | Church | 244 | Licking | 40 04 05 N | 082 18 29 W |
| Marotta Elementary School (historical) | School | 189 | Cuyahoga | 41 32 47 N | 081 37 03 W |
| Marple Cemetery | Cemetery | 319 | Licking | 40 10 29 N | 082 27 01 W |
| Marquand Mills | Populated Place | 232 | Muskingum | 40 08 45 N | 081 47 50 W |
| Marquands Mills Cemetery | Cemetery | 317 | Coshocton | 40 09 21 N | 081 46 32 W |
| Marquette Cement Company Dam Number One | Dam | 220 | Lawrence | 38 40 36 N | 082 40 48 W |
| Marquette Cement Company Reservoir | Reservoir | 220 | Lawrence | 38 40 36 N | 082 40 48 W |
| Marquis | Populated Place | 344 | Mahoning | 40 59 17 N | 080 45 50 W |
| Marquis Cemetery | Cemetery | 282 | Noble | 39 44 07 N | 081 34 11 W |
| Marr | Populated Place | 236 | Monroe | 39 37 43 N | 081 13 32 W |
| Marr Post Office (historical) | Post Office | 231 | Monroe | 39 37 45 N | 081 13 34 W |
| Marr Primary School | School | 257 | Clermont | 39 13 43 N | 084 09 14 W |
| Mars Hill Baptist Church | Church | 166 | Hamilton | 39 07 12 N | 084 31 25 W |
| Mars Hill Cemetery | Cemetery | 320 | Auglaize | 40 37 48 N | 083 58 31 W |
| Mars Landing Strip | Airport | 274 | Trumbull | 41 12 40 N | 080 58 09 W |
| Marseilles | Populated Place | 267 | Wyandot | 40 42 05 N | 083 23 34 W |
| Marseilles Elementary School | School | 268 | Wyandot | 40 42 01 N | 083 23 29 W |
| Marseilles Post Office (historical) | Post Office | 267 | Wyandot | 40 42 05 N | 083 23 35 W |
| Marseilles United Methodist Church | Church | 268 | Wyandot | 40 42 00 N | 083 23 32 W |
| Marsh Avenue Park | Park | 190 | Hamilton | 39 09 16 N | 084 26 39 W |
| Marsh Cemetery | Cemetery | 356 | Ashland | 41 00 55 N | 082 12 23 W |
| Marsh Cemetery | Cemetery | 189 | Washington | 39 33 22 N | 081 33 23 W |
| Marsh Creek | Stream | | Lake | 41 43 21 N | 081 20 23 W |
| Marsh Foundation School | School | 238 | Van Wert | 40 52 20 N | 084 33 59 W |
| Marsh Pond | Reservoir | 309 | Tuscarawas | 40 24 06 N | 081 32 11 W |
| Marsh Pond Dam | Dam | 309 | Tuscarawas | 40 24 06 N | 081 32 11 W |
| Marsh Run | Stream | | Allen | 40 51 26 N | 083 56 58 W |
| Marsh Run | Stream | | Allen | 40 53 51 N | 083 53 12 W |
| Marsh Run | Stream | | Franklin | 39 54 00 N | 083 01 30 W |
| Marsh Run | Stream | | Huron | 41 02 33 N | 082 39 54 W |
| Marsh Run | Stream | | Richland | 40 54 55 N | 082 39 23 W |
| Marsh Run School (historical) | School | 326 | Richland | 40 54 55 N | 082 39 35 W |
| Marsh Wetlands State Nature Preserve | Park | 327 | Portage | 41 16 45 N | 081 13 02 W |
| Marshall | Populated Place | 317 | Highland | 39 09 07 N | 083 29 06 W |
| Marshall Avenue Assembly of God Church | Church | 196 | Hamilton | 39 08 00 N | 084 31 37 W |
| Marshall Cemetery | Cemetery | 167 | Scioto | 38 45 37 N | 082 51 07 W |
| Marshall Church of Christ | Church | 311 | Highland | 39 09 07 N | 083 29 19 W |
| Marshall Creek | Stream | | Muskingum | 39 47 26 N | 081 48 08 W |
| Marshall Elementary School | School | 317 | Highland | 39 09 04 N | 083 29 08 W |
| Marshall Elementary School | School | 187 | Lucas | 41 37 44 N | 083 32 55 W |
| Marshall High School | School | 235 | Cuyahoga | 41 26 48 N | 081 47 30 W |
| Marshall Lake | Reservoir | 288 | Cuyahoga | 41 28 36 N | 081 34 03 W |
| Marshall Post Office (historical) | Post Office | 315 | Highland | 39 09 05 N | 083 29 05 W |
| Marshall Road First Church of God | Church | 306 | Montgomery | 39 41 09 N | 084 08 39 W |
| Marshall School | School | 183 | Scioto | 38 47 52 N | 082 45 46 W |
| Marshall School (historical) | School | 315 | Coshocton | 40 15 15 N | 081 59 47 W |
| Marshall Siding (historical) | Locale | 200 | Scioto | 38 52 28 N | 082 52 15 W |
| Marshall United Methodist Church | Church | 311 | Highland | 39 09 07 N | 083 28 56 W |
| Marshallville | Populated Place | 341 | Wayne | 40 54 08 N | 081 44 02 W |
| Marshallville Cemetery | Cemetery | 339 | Wayne | 40 53 58 N | 081 44 04 W |
| Marshes Church | Church | 302 | Fairfield | 39 48 17 N | 082 24 53 W |
| Marshfield Cemetery | Cemetery | 287 | Athens | 39 19 28 N | 082 12 41 W |
| Marshs (historical) | Populated Place | 295 | Hardin | 40 33 32 N | 083 26 30 W |
| Martel | Populated Place | 317 | Marion | 40 40 08 N | 082 54 37 W |
| Martel United Methodist Church | Church | 315 | Marion | 40 40 18 N | 082 54 35 W |
| Martin | Populated Place | 184 | Ottawa | 41 33 27 N | 083 20 12 W |
| Martin Cemetery | Cemetery | 232 | Athens | 39 13 01 N | 082 14 54 W |
| Martin Cemetery | Cemetery | 271 | Brown | 38 46 55 N | 083 51 17 W |
| Martin Cemetery | Cemetery | 317 | Champaign | 40 11 22 N | 083 31 05 W |
| Martin Cemetery | Cemetery | 313 | Darke | 40 05 21 N | 084 34 12 W |
| Martin Cemetery | Cemetery | 295 | Delaware | 40 22 01 N | 083 01 03 W |
| Martin Cemetery | Cemetery | 228 | Meigs | 38 56 36 N | 081 46 55 W |
| Martin Cemetery | Cemetery | 262 | Scioto | 38 53 26 N | 083 05 58 W |
| Martin Cemetery | Cemetery | 214 | Scioto | 38 54 50 N | 082 53 10 W |
| Martin Dining Hall | Building | 261 | Butler | 39 30 55 N | 084 44 01 W |
| Martin Ditch | Canal | 196 | Wood | 41 26 16 N | 083 26 05 W |
| Martin Elementary School | School | 193 | Lucas | 41 38 17 N | 083 41 05 W |
| Martin Field | Airport | 329 | Stark | 40 51 12 N | 081 19 16 W |
| Martin Hill Cemetery | Cemetery | 275 | Brown | 38 42 01 N | 083 45 17 W |
| Martin Hollow | Valley | | Adams | 38 49 42 N | 083 17 32 W |
| Martin Luther Evangelical Lutheran Church | Church | 232 | Franklin | 39 56 03 N | 082 58 52 W |
| Martin Luther King Branch Cleveland Public Library | Building | 207 | Cuyahoga | 41 30 16 N | 081 36 48 W |
| Martin Luther King Center | Building | 245 | Franklin | 39 58 14 N | 082 58 51 W |
| Martin Luther King Junior Memorial Bridge | Bridge | 174 | Lucas | 41 39 08 N | 083 31 41 W |
| Martin Luther King Junior Shopping Center | Locale | 199 | Cuyahoga | 41 30 56 N | 081 37 19 W |
| Martin Luther King Library | Building | 244 | Franklin | 39 58 06 N | 082 57 42 W |
| Martin Luther King Shopping Center | Locale | 161 | Hamilton | 39 06 37 N | 084 31 26 W |
| Martin Luther Lutheran Church | Church | 208 | Cuyahoga | 41 28 37 N | 081 44 41 W |
| Martin Luther Lutheran Church | Church | 186 | Lucas | 41 38 23 N | 083 31 15 W |
| Martin Luther Lutheran Church | Church | 325 | Mahoning | 41 03 57 N | 080 40 01 W |
| Martin Luther Lutheran Church | Church | 322 | Stark | 40 48 09 N | 081 22 18 W |
| Martin Point | Cape | 174 | Erie | 41 28 25 N | 082 49 39 W |
| Martin Post Office | Post Office | 184 | Ottawa | 41 33 25 N | 083 20 10 W |
| Martin Run | Stream | | Lorain | 41 26 54 N | 082 13 30 W |
| Martin School | School | 317 | Stark | 40 47 40 N | 081 21 49 W |
| Martin School (historical) | School | 281 | Brown | 38 52 16 N | 083 58 26 W |
| Martin University Center | Building | 329 | Summit | 41 04 42 N | 081 30 24 W |
| Martindale Park | Park | 320 | Stark | 40 50 37 N | 081 21 07 W |
| Martindill Cemetery | Cemetery | 233 | Vinton | 39 14 12 N | 082 33 11 W |
| Marting Hall | Building | 242 | Cuyahoga | 41 22 05 N | 081 51 04 W |
| Martini United Church of Christ | Church | 176 | Hamilton | 39 07 43 N | 084 33 58 W |
| Martins Cemetery | Cemetery | 163 | Hamilton | 39 08 39 N | 084 19 08 W |
| Martins Church | Church | 334 | Wayne | 40 49 18 N | 081 43 55 W |
| Martins Creek | Stream | | Holmes | 40 36 32 N | 081 55 30 W |
| Martins Creek Cemetery | Cemetery | 338 | Holmes | 40 34 23 N | 081 50 27 W |