| Sintra to McKeesport (Pennsylvania) | 3,649.41 mi (5,873.15 km) |
| Sintra to McKinleyville (California) | 5,563.36 mi (8,953.36 km) |
| Sintra to McKinney (Texas) | 4,700.61 mi (7,564.91 km) |
| Sintra to McLean (Virginia) | 3,556.77 mi (5,724.08 km) |
| Sintra to McMinnville (Oregon) | 5,327.70 mi (8,574.11 km) |
| Sintra to McMinnville (Tennessee) | 4,079.25 mi (6,564.92 km) |
| Sintra to McNair (Virginia) | 3,567.33 mi (5,741.06 km) |
| Sintra to McPherson (Kansas) | 4,557.35 mi (7,334.35 km) |
| Sintra to Mead Valley (California) | 5,622.60 mi (9,048.71 km) |
| Sintra to Meadow Woods (Florida) | 4,099.21 mi (6,597.04 km) |
| Sintra to Meadowbrook (Virginia) | 3,612.14 mi (5,813.17 km) |
| Sintra to Meadville (Pennsylvania) | 3,629.61 mi (5,841.29 km) |
| Sintra to Mebane (North Carolina) | 3,741.47 mi (6,021.31 km) |
| Sintra to Mechanicsville (Virginia) | 3,600.75 mi (5,794.85 km) |
| Sintra to Medford (Massachusetts) | 3,174.96 mi (5,109.60 km) |
