| Castelo Branco to Orangevale (California) | 5,585.98 mi (8,989.76 km) |
| Castelo Branco to Orchards (Washington) | 5,294.87 mi (8,521.26 km) |
| Castelo Branco to Orcutt (California) | 5,739.68 mi (9,237.12 km) |
| Castelo Branco to Oregon (Ohio) | 3,841.07 mi (6,181.61 km) |
| Castelo Branco to Oregon (Wisconsin) | 4,074.61 mi (6,557.45 km) |
| Castelo Branco to Oregon City (Oregon) | 5,313.78 mi (8,551.71 km) |
| Castelo Branco to Orem (Utah) | 5,134.27 mi (8,262.81 km) |
| Castelo Branco to Orinda (California) | 5,662.15 mi (9,112.36 km) |
| Castelo Branco to Orland Park (Illinois) | 4,047.28 mi (6,513.47 km) |
| Castelo Branco to Orlando (Florida) | 4,176.32 mi (6,721.14 km) |
| Castelo Branco to Ormond Beach (Florida) | 4,134.33 mi (6,653.57 km) |
| Castelo Branco to Oro Valley (Arizona) | 5,452.76 mi (8,775.37 km) |
| Castelo Branco to Oroville (California) | 5,559.65 mi (8,947.39 km) |
| Castelo Branco to Oshkosh (Wisconsin) | 4,003.27 mi (6,442.64 km) |
| Castelo Branco to Oskaloosa (Iowa) | 4,274.93 mi (6,879.83 km) |
