| Castelo Branco to Oberriet | 996.02 mi (1,602.94 km) |
| Castelo Branco to Obersiggenthal | 948.04 mi (1,525.72 km) |
| Castelo Branco to Oberwil | 918.83 mi (1,478.71 km) |
| Castelo Branco to Oberwingert | 968.71 mi (1,558.98 km) |
| Castelo Branco to Oftringen | 927.01 mi (1,491.88 km) |
| Castelo Branco to Olten | 927.42 mi (1,492.53 km) |
| Castelo Branco to Onex | 814.25 mi (1,310.41 km) |
| Castelo Branco to Opfikon | 957.66 mi (1,541.20 km) |
| Castelo Branco to Ostermundigen | 897.51 mi (1,444.41 km) |
| Castelo Branco to Payerne | 869.86 mi (1,399.90 km) |
| Castelo Branco to Pfaffikon | 964.57 mi (1,552.33 km) |
| Castelo Branco to Plan-les-Ouates | 814.42 mi (1,310.68 km) |
| Castelo Branco to Pratteln | 924.83 mi (1,488.38 km) |
| Castelo Branco to Prilly | 846.65 mi (1,362.56 km) |
| Castelo Branco to Pully | 848.91 mi (1,366.19 km) |
