| Sintra to Monticello (Minnesota) | 4,151.25 mi (6,680.80 km) |
| Sintra to Montrose (Colorado) | 5,012.55 mi (8,066.92 km) |
| Sintra to Moody (Alabama) | 4,184.02 mi (6,733.53 km) |
| Sintra to Moore (Oklahoma) | 4,660.03 mi (7,499.59 km) |
| Sintra to Moorestown-Lenola (New Jersey) | 3,420.05 mi (5,504.04 km) |
| Sintra to Mooresville (North Carolina) | 3,834.83 mi (6,171.56 km) |
| Sintra to Moorhead (Minnesota) | 4,228.15 mi (6,804.55 km) |
| Sintra to Moorpark (California) | 5,669.73 mi (9,124.56 km) |
| Sintra to Moraga (California) | 5,636.02 mi (9,070.29 km) |
| Sintra to Moreno Valley (California) | 5,614.97 mi (9,036.42 km) |
| Sintra to Morgan City (Louisiana) | 4,559.03 mi (7,337.05 km) |
| Sintra to Morgan Hill (California) | 5,650.55 mi (9,093.69 km) |
| Sintra to Morganton (North Carolina) | 3,873.95 mi (6,234.53 km) |
| Sintra to Morgantown (West Virginia) | 3,673.44 mi (5,911.83 km) |
| Sintra to Morris (Illinois) | 4,028.78 mi (6,483.69 km) |
