| Santo Tirso to Oakley (California) | 5,529.46 mi (8,898.80 km) |
| Santo Tirso to Oakton (Virginia) | 3,542.41 mi (5,700.95 km) |
| Santo Tirso to Oakville (Missouri) | 4,172.98 mi (6,715.77 km) |
| Santo Tirso to Oatfield (Oregon) | 5,198.12 mi (8,365.56 km) |
| Santo Tirso to Ocala (Florida) | 4,117.40 mi (6,626.31 km) |
| Santo Tirso to Ocean Acres (New Jersey) | 3,371.19 mi (5,425.40 km) |
| Santo Tirso to Ocean City (New Jersey) | 3,400.46 mi (5,472.51 km) |
| Santo Tirso to Ocean Pines (Maryland) | 3,453.18 mi (5,557.35 km) |
| Santo Tirso to Ocean Pointe (Hawaii) | 7,689.23 mi (12,374.63 km) |
| Santo Tirso to Ocean Springs (Mississippi) | 4,400.76 mi (7,082.33 km) |
| Santo Tirso to Oceanside (California) | 5,586.22 mi (8,990.16 km) |
| Santo Tirso to Oceanside (New York) | 3,315.16 mi (5,335.23 km) |
| Santo Tirso to Ocoee (Florida) | 4,108.96 mi (6,612.73 km) |
| Santo Tirso to Oconomowoc (Wisconsin) | 3,930.96 mi (6,326.26 km) |
| Santo Tirso to Odenton (Maryland) | 3,507.69 mi (5,645.08 km) |
