| Portici to Oberriet | 507.38 mi (816.55 km) |
| Portici to Obersiggenthal | 549.27 mi (883.96 km) |
| Portici to Oberwil | 571.38 mi (919.55 km) |
| Portici to Oberwingert | 538.54 mi (866.70 km) |
| Portici to Oftringen | 550.24 mi (885.52 km) |
| Portici to Olten | 552.54 mi (889.22 km) |
| Portici to Onex | 554.37 mi (892.17 km) |
| Portici to Opfikon | 538.93 mi (867.32 km) |
| Portici to Ostermundigen | 543.71 mi (875.01 km) |
| Portici to Payerne | 554.54 mi (892.45 km) |
| Portici to Pfaffikon | 529.47 mi (852.11 km) |
| Portici to Plan-les-Ouates | 553.02 mi (890.01 km) |
| Portici to Pratteln | 567.37 mi (913.09 km) |
| Portici to Prilly | 552.19 mi (888.67 km) |
| Portici to Pully | 549.09 mi (883.67 km) |
