| Castelo Branco to Oswego (Illinois) | 4,066.62 mi (6,544.59 km) |
| Castelo Branco to Oswego (New York) | 3,467.98 mi (5,581.18 km) |
| Castelo Branco to Otsego (Minnesota) | 4,184.52 mi (6,734.34 km) |
| Castelo Branco to Ottawa (Illinois) | 4,099.56 mi (6,597.61 km) |
| Castelo Branco to Ottawa (Kansas) | 4,489.78 mi (7,225.60 km) |
| Castelo Branco to Ottumwa (Iowa) | 4,274.28 mi (6,878.79 km) |
| Castelo Branco to Overland (Missouri) | 4,260.07 mi (6,855.92 km) |
| Castelo Branco to Overland Park (Kansas) | 4,452.91 mi (7,166.26 km) |
| Castelo Branco to Overlea (Maryland) | 3,577.19 mi (5,756.94 km) |
| Castelo Branco to Oviedo (Florida) | 4,162.01 mi (6,698.10 km) |
| Castelo Branco to Owasso (Oklahoma) | 4,602.22 mi (7,406.56 km) |
| Castelo Branco to Owatonna (Minnesota) | 4,206.54 mi (6,769.77 km) |
| Castelo Branco to Owensboro (Kentucky) | 4,138.59 mi (6,660.41 km) |
| Castelo Branco to Owings Mills (Maryland) | 3,589.20 mi (5,776.26 km) |
| Castelo Branco to Owosso (Michigan) | 3,835.96 mi (6,173.39 km) |
