| Opelika to McHenry (Illinois) | 687.37 mi (1,106.22 km) |
| Opelika to McKeesport (Pennsylvania) | 612.90 mi (986.37 km) |
| Opelika to McKinleyville (California) | 2,197.27 mi (3,536.16 km) |
| Opelika to McKinney (Texas) | 655.48 mi (1,054.89 km) |
| Opelika to McLean (Virginia) | 630.88 mi (1,015.30 km) |
| Opelika to McMinnville (Oregon) | 2,184.66 mi (3,515.86 km) |
| Opelika to McMinnville (Tennessee) | 210.29 mi (338.44 km) |
| Opelika to McNair (Virginia) | 622.48 mi (1,001.78 km) |
| Opelika to McPherson (Kansas) | 794.52 mi (1,278.66 km) |
| Opelika to Mead Valley (California) | 1,838.18 mi (2,958.26 km) |
| Opelika to Meadow Woods (Florida) | 381.32 mi (613.67 km) |
| Opelika to Meadowbrook (Virginia) | 555.00 mi (893.18 km) |
| Opelika to Meadville (Pennsylvania) | 684.09 mi (1,100.94 km) |
| Opelika to Mebane (North Carolina) | 420.70 mi (677.05 km) |
| Opelika to Mechanicsville (Virginia) | 567.99 mi (914.09 km) |
