| Santo Tirso to Orangevale (California) | 5,477.22 mi (8,814.73 km) |
| Santo Tirso to Orchards (Washington) | 5,182.47 mi (8,340.39 km) |
| Santo Tirso to Orcutt (California) | 5,633.40 mi (9,066.08 km) |
| Santo Tirso to Oregon (Ohio) | 3,747.23 mi (6,030.58 km) |
| Santo Tirso to Oregon (Wisconsin) | 3,976.46 mi (6,399.49 km) |
| Santo Tirso to Oregon City (Oregon) | 5,201.51 mi (8,371.02 km) |
| Santo Tirso to Orem (Utah) | 5,028.55 mi (8,092.67 km) |
| Santo Tirso to Orinda (California) | 5,553.42 mi (8,937.37 km) |
| Santo Tirso to Orland Park (Illinois) | 3,951.37 mi (6,359.12 km) |
| Santo Tirso to Orlando (Florida) | 4,102.93 mi (6,603.02 km) |
| Santo Tirso to Ormond Beach (Florida) | 4,059.88 mi (6,533.74 km) |
| Santo Tirso to Oro Valley (Arizona) | 5,353.33 mi (8,615.35 km) |
| Santo Tirso to Oroville (California) | 5,450.34 mi (8,771.47 km) |
| Santo Tirso to Oshkosh (Wisconsin) | 3,904.22 mi (6,283.24 km) |
| Santo Tirso to Oskaloosa (Iowa) | 4,177.09 mi (6,722.38 km) |
