| Santo Tirso to Odessa (Texas) | 4,988.59 mi (8,028.36 km) |
| Santo Tirso to Ogden (Utah) | 4,998.01 mi (8,043.51 km) |
| Santo Tirso to Oildale (California) | 5,550.38 mi (8,932.47 km) |
| Santo Tirso to Ojus (Florida) | 4,140.47 mi (6,663.45 km) |
| Santo Tirso to Okemos (Michigan) | 3,759.68 mi (6,050.62 km) |
| Santo Tirso to Oklahoma City (Oklahoma) | 4,617.82 mi (7,431.67 km) |
| Santo Tirso to Okmulgee (Oklahoma) | 4,542.61 mi (7,310.63 km) |
| Santo Tirso to Olathe (Kansas) | 4,362.79 mi (7,021.23 km) |
| Santo Tirso to Old Jamestown (Missouri) | 4,157.36 mi (6,690.63 km) |
| Santo Tirso to Oldsmar (Florida) | 4,186.75 mi (6,737.92 km) |
| Santo Tirso to Olean (New York) | 3,502.20 mi (5,636.25 km) |
| Santo Tirso to Olive Branch (Mississippi) | 4,278.39 mi (6,885.40 km) |
| Santo Tirso to Olivehurst (California) | 5,470.72 mi (8,804.28 km) |
| Santo Tirso to Olney (Maryland) | 3,523.49 mi (5,670.51 km) |
| Santo Tirso to Olympia (Washington) | 5,129.03 mi (8,254.38 km) |
