| Greenock to McKeesport (Pennsylvania) | 3,436.77 mi (5,530.94 km) |
| Greenock to McKinleyville (California) | 4,862.18 mi (7,824.93 km) |
| Greenock to McKinney (Texas) | 4,422.93 mi (7,118.02 km) |
| Greenock to McLean (Virginia) | 3,405.49 mi (5,480.61 km) |
| Greenock to McMinnville (Oregon) | 4,588.23 mi (7,384.04 km) |
| Greenock to McMinnville (Tennessee) | 3,892.31 mi (6,264.07 km) |
| Greenock to McNair (Virginia) | 3,413.33 mi (5,493.22 km) |
| Greenock to McPherson (Kansas) | 4,181.38 mi (6,729.28 km) |
| Greenock to Mead Valley (California) | 5,081.80 mi (8,178.37 km) |
| Greenock to Meadow Woods (Florida) | 4,108.83 mi (6,612.52 km) |
| Greenock to Meadowbrook (Virginia) | 3,490.94 mi (5,618.13 km) |
| Greenock to Meadville (Pennsylvania) | 3,384.81 mi (5,447.33 km) |
| Greenock to Mebane (North Carolina) | 3,626.89 mi (5,836.92 km) |
| Greenock to Mechanicsville (Virginia) | 3,476.70 mi (5,595.20 km) |
| Greenock to Medford (Massachusetts) | 3,008.94 mi (4,842.42 km) |
