| Castelo Branco to Oak Harbor (Washington) | 5,172.90 mi (8,324.99 km) |
| Castelo Branco to Oak Hills (Oregon) | 5,312.77 mi (8,550.08 km) |
| Castelo Branco to Oak Lawn (Illinois) | 4,038.90 mi (6,499.98 km) |
| Castelo Branco to Oak Park (California) | 5,705.02 mi (9,181.35 km) |
| Castelo Branco to Oak Park (Illinois) | 4,035.11 mi (6,493.87 km) |
| Castelo Branco to Oak Park (Michigan) | 3,805.64 mi (6,124.58 km) |
| Castelo Branco to Oak Ridge (Florida) | 4,180.61 mi (6,728.04 km) |
| Castelo Branco to Oak Ridge (New Jersey) | 3,433.95 mi (5,526.40 km) |
| Castelo Branco to Oak Ridge (Tennessee) | 4,062.44 mi (6,537.86 km) |
| Castelo Branco to Oakdale (California) | 5,616.39 mi (9,038.70 km) |
| Castelo Branco to Oakdale (Minnesota) | 4,165.46 mi (6,703.67 km) |
| Castelo Branco to Oakland (California) | 5,668.03 mi (9,121.82 km) |
| Castelo Branco to Oakland (New Jersey) | 3,421.58 mi (5,506.51 km) |
| Castelo Branco to Oakland Park (Florida) | 4,200.16 mi (6,759.51 km) |
| Castelo Branco to Oakleaf Plantation (Florida) | 4,140.49 mi (6,663.47 km) |
