| Middletown to McHenry (Illinois) | 283.52 mi (456.28 km) |
| Middletown to McKeesport (Pennsylvania) | 246.48 mi (396.67 km) |
| Middletown to McKinleyville (California) | 2,079.61 mi (3,346.80 km) |
| Middletown to McKinney (Texas) | 810.10 mi (1,303.73 km) |
| Middletown to McLean (Virginia) | 385.70 mi (620.73 km) |
| Middletown to McMinnville (Oregon) | 2,001.09 mi (3,220.44 km) |
| Middletown to McMinnville (Tennessee) | 274.86 mi (442.34 km) |
| Middletown to McNair (Virginia) | 374.07 mi (602.01 km) |
| Middletown to McPherson (Kansas) | 718.09 mi (1,155.66 km) |
| Middletown to Mead Valley (California) | 1,855.10 mi (2,985.50 km) |
| Middletown to Meadow Woods (Florida) | 788.34 mi (1,268.71 km) |
| Middletown to Meadowbrook (Virginia) | 399.27 mi (642.57 km) |
| Middletown to Meadville (Pennsylvania) | 266.36 mi (428.67 km) |
| Middletown to Mebane (North Carolina) | 364.68 mi (586.90 km) |
| Middletown to Mechanicsville (Virginia) | 400.16 mi (643.99 km) |
