Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Mayfair Elementary School | School | 199 | Cuyahoga | 41 32 03 N | 081 35 07 W |
| Mayfair Elementary School | School | 183 | Lucas | 41 42 48 N | 083 33 27 W |
| Mayfair Park (subdivision) | Populated Place | 184 | Lucas | 41 42 36 N | 083 33 42 W |
| Mayfair Plymouth Congregational Christian Church | Church | 183 | Lucas | 41 42 43 N | 083 33 26 W |
| Mayfield | Populated Place | 207 | Butler | 39 29 41 N | 084 22 22 W |
| Mayfield | Populated Place | 282 | Cuyahoga | 41 33 07 N | 081 26 21 W |
| Mayfield Airport | Airport | 332 | Summit | 40 59 33 N | 081 25 54 W |
| Mayfield Cemetery | Cemetery | 252 | Cuyahoga | 41 30 48 N | 081 34 55 W |
| Mayfield Cemetery | Cemetery | 288 | Delaware | 40 25 59 N | 083 03 58 W |
| Mayfield Center Elementary School | School | 293 | Cuyahoga | 41 32 24 N | 081 26 25 W |
| Mayfield Center High School | School | 310 | Cuyahoga | 41 31 45 N | 081 26 16 W |
| Mayfield Corners | Locale | 280 | Marion | 40 26 04 N | 083 02 56 W |
| Mayfield Country Club | Locale | 303 | Cuyahoga | 41 30 55 N | 081 30 33 W |
| Mayfield Elementary School | School | 208 | Butler | 39 29 45 N | 084 22 13 W |
| Mayfield Heights | Populated Place | 332 | Cuyahoga | 41 31 09 N | 081 27 28 W |
| Mayfield Heights City Hall | Building | 332 | Cuyahoga | 41 31 11 N | 081 27 27 W |
| Mayfield High School | School | 316 | Cuyahoga | 41 32 12 N | 081 27 32 W |
| Mayfield Park | Park | 253 | Hamilton | 39 06 58 N | 084 34 19 W |
| Mayfield Post Office (historical) | Post Office | 282 | Cuyahoga | 41 33 05 N | 081 26 19 W |
| Mayfield Road School | School | 329 | Cuyahoga | 41 31 12 N | 081 27 09 W |
| Mayfield Temple | Church | 259 | Cuyahoga | 41 30 52 N | 081 34 20 W |
| Mayfield Town Hall | Building | 293 | Cuyahoga | 41 32 21 N | 081 26 24 W |
| Mayfield Union Cemetery | Cemetery | 299 | Cuyahoga | 41 32 18 N | 081 26 32 W |
| Mayflower Congregational Church (historical) | Church | 209 | Cuyahoga | 41 31 14 N | 081 35 33 W |
| Mayflower Elementary School | School | 207 | Cuyahoga | 41 29 22 N | 081 40 09 W |
| Mayflower Manor | Building | | Summit | 41 04 43 N | 081 31 14 W |
| Mayflower Memorial Congregational Church (historical) | Church | 369 | Richland | 40 46 14 N | 082 31 15 W |
| Mayflower Village | Populated Place | 313 | Stark | 40 48 01 N | 081 33 09 W |
| Mayhew Art Gallery | Building | 266 | Delaware | 40 17 48 N | 083 04 05 W |
| Mayhill Church of Christ | Church | 304 | Adams | 39 00 51 N | 083 30 24 W |
| Mayhill Post Office (historical) | Post Office | 306 | Adams | 39 00 45 N | 083 30 30 W |
| Mayland Shopping Center | Locale | 334 | Cuyahoga | 41 31 10 N | 081 28 01 W |
| Mayme Moore Park | Park | 245 | Franklin | 39 58 14 N | 082 58 55 W |
| Maymore Shopping Center | Locale | 313 | Cuyahoga | 41 31 08 N | 081 29 39 W |
| Maynard | Populated Place | 265 | Belmont | 40 07 24 N | 080 52 45 W |
| Maynard Avenue Baptist Church | Church | 260 | Franklin | 40 00 38 N | 082 58 49 W |
| Maynard Avenue United Methodist Church | Church | 256 | Franklin | 40 00 41 N | 083 00 08 W |
| Maynard Elementary School (historical) | School | 253 | Belmont | 40 07 20 N | 080 52 36 W |
| Maynard Post Office | Post Office | 258 | Belmont | 40 07 25 N | 080 52 44 W |
| Maynard-Summit Park | Park | 219 | Franklin | 39 57 36 N | 083 00 21 W |
| Mays Cemetery | Cemetery | 237 | Lawrence | 38 32 23 N | 082 33 25 W |
| Mays Chapel United Holy Church of America | Church | 187 | Lucas | 41 37 28 N | 083 30 40 W |
| Mays Fork | Stream | | Muskingum | 39 51 12 N | 081 41 09 W |
| Mays Heliport | Airport | 152 | Hamilton | 39 07 05 N | 084 22 27 W |
| Mays School (historical) | School | 329 | Harrison | 40 16 52 N | 081 18 35 W |
| Maysville | Populated Place | 308 | Allen | 40 43 57 N | 083 52 48 W |
| Maysville | Populated Place | 238 | Coshocton | 40 09 15 N | 081 47 59 W |
| Maysville | Populated Place | 286 | Hocking | 39 32 59 N | 082 19 16 W |
| Maysville | Populated Place | 250 | Muskingum | 39 53 46 N | 082 02 02 W |
| Maysville | Populated Place | 349 | Wayne | 40 41 50 N | 081 47 33 W |
| Maysville Cemetery | Cemetery | 308 | Hardin | 40 44 01 N | 083 52 39 W |
| Maysville Church | Church | 349 | Wayne | 40 43 27 N | 081 49 23 W |
| Maysville High School | School | 244 | Muskingum | 39 53 43 N | 082 02 60 W |
| Maysville Junior High School | School | 251 | Muskingum | 39 53 44 N | 082 02 52 W |
| Maysville Methodist Cemetery | Cemetery | 234 | Muskingum | 40 09 16 N | 081 48 02 W |
| Mazeroski Park | Park | 197 | Jefferson | 40 11 09 N | 080 41 16 W |
| McAdams School | School | 285 | Clark | 39 53 43 N | 084 02 47 W |
| McAdoo Cemetery | Cemetery | 366 | Ashland | 40 49 43 N | 082 18 15 W |
| McArdle Airport | Airport | 217 | Wood | 41 12 58 N | 083 33 25 W |
| McArthur | Populated Place | 233 | Vinton | 39 14 47 N | 082 28 43 W |
| McArthur Cemetery | Cemetery | 307 | Hardin | 40 34 51 N | 083 49 17 W |
| McArthur Chapel | Church | 249 | Vinton | 39 20 48 N | 082 27 18 W |
| McArthur Elementary School | School | 185 | Ross | 39 19 53 N | 082 57 07 W |
| McArthur United Methodist Church | Church | 229 | Vinton | 39 14 43 N | 082 28 44 W |
| McAtee Landing | Locale | 150 | Scioto | 38 37 12 N | 083 09 40 W |
| McAtee Run | Stream | | Scioto | 38 37 12 N | 083 09 32 W |
| McAuley High School | School | 278 | Hamilton | 39 12 03 N | 084 33 10 W |
| McAuley High School | School | 191 | Lucas | 41 35 59 N | 083 36 06 W |
| McAvan | Populated Place | 226 | Washington | 39 23 32 N | 081 34 26 W |
| McBee Heliport | Airport | 189 | Athens | 39 19 47 N | 082 02 39 W |
| McBride Ditch | Canal | 249 | Allen | 40 44 09 N | 084 12 56 W |
| McBride Field | Park | 295 | Knox | 40 22 20 N | 082 23 34 W |
| McBride Hall | Building | 268 | Butler | 39 30 38 N | 084 43 38 W |
| McBride Lake | Reservoir | 220 | Scioto | 38 39 29 N | 083 10 38 W |
| McBride Park | Park | 332 | Richland | 40 53 24 N | 082 39 25 W |
| McBride Park | Park | 266 | Trumbull | 41 13 26 N | 080 48 22 W |
| McBride Run | Stream | | Noble | 39 44 27 N | 081 19 35 W |
| McBride Run | Stream | | Scioto | 38 39 19 N | 083 10 36 W |
| McBridge School (historical) | School | 340 | Scioto | 38 57 00 N | 083 12 49 W |
| McBroom Cemetery | Cemetery | 326 | Hocking | 39 32 05 N | 082 33 52 W |
| McBroom Junior High School | School | 262 | Auglaize | 40 32 28 N | 084 23 18 W |
| McCabe Creek | Stream | | Medina | 41 04 20 N | 081 54 28 W |
| McCabe Park | Park | 257 | Montgomery | 39 44 37 N | 084 14 40 W |
| McCafferty Road Bridge | Bridge | 263 | Brown | 39 09 05 N | 083 59 40 W |
| McCaffery Park | Park | 323 | Summit | 40 59 55 N | 081 37 55 W |
| McCall Cemetery | Cemetery | 184 | Adams | 38 36 29 N | 083 16 57 W |
| McCall Creek | Stream | | Lawrence | 38 28 40 N | 082 18 42 W |
| McCall Run | Stream | | Adams | 38 36 10 N | 083 16 59 W |
| McCalls Cemetery | Cemetery | 207 | Gallia | 38 44 06 N | 082 18 52 W |
| McCalls Landing | Locale | 149 | Adams | 38 36 06 N | 083 17 04 W |
| McCampbell Hall | Building | 219 | Franklin | 39 59 37 N | 083 01 15 W |
| McCance | Populated Place | 336 | Wayne | 40 41 52 N | 081 53 03 W |
| McCarthy Park | Park | 297 | Union | 40 14 30 N | 083 21 25 W |
| McCarthyville Elementary School | School | 295 | Shelby | 40 23 42 N | 084 15 13 W |
| McCartney School | School | 321 | Mahoning | 41 05 09 N | 080 36 15 W |
| McCartney School (historical) | School | 224 | Defiance | 41 16 02 N | 084 44 49 W |
| McCarty Cemetery | Cemetery | 276 | Adams | 38 47 56 N | 083 28 58 W |
| McCarty Cemetery | Cemetery | 177 | Gallia | 38 56 35 N | 082 07 60 W |
| McCarty School (historical) | School | 304 | Morgan | 39 38 33 N | 081 48 16 W |
| McCartyville | Populated Place | 297 | Shelby | 40 23 41 N | 084 15 21 W |
| McCartyville Post Office (historical) | Post Office | 297 | Shelby | 40 23 40 N | 084 15 20 W |
| McCaskey Cemetery | Cemetery | 198 | Meigs | 39 04 04 N | 082 13 37 W |
| McCaslin Family Cemetery | Cemetery | 302 | Perry | 39 43 58 N | 082 05 13 W |
| McCauley Cemetery | Cemetery | 214 | Defiance | 41 22 11 N | 084 25 13 W |
| McChesney Ridge | Ridge | 293 | Scioto | 38 55 06 N | 083 06 48 W |
| McClain Cemetery | Cemetery | 265 | Wyandot | 40 47 04 N | 083 14 27 W |
| McClain Field | Airport | 360 | Carroll | 40 36 30 N | 080 55 59 W |
| McClain High School | School | 283 | Highland | 39 21 05 N | 083 23 19 W |
| McClainville | Populated Place | 207 | Belmont | 40 01 24 N | 080 47 34 W |
| McClainville Post Office (historical) | Post Office | 207 | Belmont | 40 01 25 N | 080 47 34 W |