| Santo Tirso to Oswego (Illinois) | 3,970.39 mi (6,389.72 km) |
| Santo Tirso to Oswego (New York) | 3,374.79 mi (5,431.19 km) |
| Santo Tirso to Otsego (Minnesota) | 4,082.16 mi (6,569.60 km) |
| Santo Tirso to Ottawa (Illinois) | 4,003.48 mi (6,442.99 km) |
| Santo Tirso to Ottawa (Kansas) | 4,393.52 mi (7,070.68 km) |
| Santo Tirso to Ottumwa (Iowa) | 4,176.85 mi (6,721.99 km) |
| Santo Tirso to Overland (Missouri) | 4,166.34 mi (6,705.08 km) |
| Santo Tirso to Overland Park (Kansas) | 4,356.64 mi (7,011.34 km) |
| Santo Tirso to Overlea (Maryland) | 3,490.26 mi (5,617.03 km) |
| Santo Tirso to Oviedo (Florida) | 4,088.46 mi (6,579.74 km) |
| Santo Tirso to Owasso (Oklahoma) | 4,508.13 mi (7,255.14 km) |
| Santo Tirso to Owatonna (Minnesota) | 4,105.50 mi (6,607.16 km) |
| Santo Tirso to Owensboro (Kentucky) | 4,047.86 mi (6,514.40 km) |
| Santo Tirso to Owings Mills (Maryland) | 3,502.04 mi (5,635.99 km) |
| Santo Tirso to Owosso (Michigan) | 3,740.04 mi (6,019.00 km) |
