Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Manzanita Park | Park | 47 | Orange | 33 51 11 N | 117 55 43 W |
| Maple Avenue School | School | 47 | Orange | 33 51 57 N | 117 55 16 W |
| Maple Spring | Spring | 1295 | Orange | 33 43 54 N | 117 32 55 W |
| Maple Spring Truck Trail | Trail | 1052 | Orange | 33 44 29 N | 117 32 46 W |
| Maranatha Christian Academy | School | 7 | Orange | 33 41 50 N | 117 54 32 W |
| Marco Forster Middle School | School | 23 | Orange | 33 29 16 N | 117 40 45 W |
| Margaret Landell Elementary School | School | 10 | Orange | 33 49 16 N | 118 03 19 W |
| Marguerite M O'Neill Elementary School | School | 149 | Orange | 33 36 17 N | 117 40 09 W |
| Marguerite M O'Neill Park | Park | 121 | Orange | 33 36 10 N | 117 41 14 W |
| Marina Community Park | Park | 2 | Orange | 33 44 45 N | 118 06 38 W |
| Marina High School | School | 4 | Orange | 33 43 53 N | 118 01 33 W |
| Marina View Park | Park | 15 | Orange | 33 38 33 N | 117 56 34 W |
| Marine Corps Air Station El Toro (historical) | Military (Historical) | | Orange | 33 40 18 N | 117 43 05 W |
| Marine Corps Air Station Tustin (historical) | Military (Historical) | | Orange | 33 42 22 N | 117 49 35 W |
| Marine Memorial Golf Course | Locale | 105 | Orange | 33 39 34 N | 117 43 13 W |
| Marine View Middle School | School | 1 | Orange | 33 42 34 N | 118 01 46 W |
| Marine View Park | Park | 0 | Orange | 33 42 32 N | 118 01 50 W |
| Mariners Branch Newport Beach Public Library | Building | 25 | Orange | 33 37 58 N | 117 54 09 W |
| Mariners Elementary School | School | 26 | Orange | 33 37 54 N | 117 54 15 W |
| Mariners Park | Park | 25 | Orange | 33 37 56 N | 117 54 10 W |
| Mariposa Elementary School | School | 132 | Orange | 33 56 06 N | 117 53 49 W |
| Mark Twain Special Center | School | 33 | Orange | 33 47 30 N | 117 56 12 W |
| Market on the Lake Shopping Center | Locale | 235 | Orange | 33 37 58 N | 117 38 45 W |
| Marlboro | Populated Place | 55 | Orange | 33 48 45 N | 117 51 32 W |
| Martin Luther Hospital | Hospital | 40 | Orange | 33 51 04 N | 117 56 43 W |
| Martin R Heninger Elementary School | School | 33 | Orange | 33 44 42 N | 117 52 18 W |
| Martins Landing Field (historical) | Airport | 11 | Orange | 33 41 04 N | 117 51 58 W |
| Mary Wilson Branch Orange County Public Library | Building | 3 | Orange | 33 44 37 N | 118 06 17 W |
| Marywood Central Catholic High School (historical) | School | | Orange | 33 49 57 N | 117 55 05 W |
| Marywood School | School | 167 | Orange | 33 50 06 N | 117 49 26 W |