| Piqua to Nyon | 4,315.32 mi (6,944.84 km) |
| Piqua to Oberriet | 4,416.73 mi (7,108.05 km) |
| Piqua to Obersiggenthal | 4,359.76 mi (7,016.36 km) |
| Piqua to Oberwil | 4,329.28 mi (6,967.30 km) |
| Piqua to Oberwingert | 4,377.72 mi (7,045.26 km) |
| Piqua to Oftringen | 4,350.78 mi (7,001.91 km) |
| Piqua to Olten | 4,348.93 mi (6,998.93 km) |
| Piqua to Onex | 4,316.84 mi (6,947.29 km) |
| Piqua to Opfikon | 4,372.66 mi (7,037.11 km) |
| Piqua to Ostermundigen | 4,346.40 mi (6,994.85 km) |
| Piqua to Payerne | 4,328.72 mi (6,966.41 km) |
| Piqua to Pfaffikon | 4,383.70 mi (7,054.89 km) |
| Piqua to Plan-les-Ouates | 4,318.11 mi (6,949.33 km) |
| Piqua to Pratteln | 4,335.00 mi (6,976.51 km) |
| Piqua to Prilly | 4,325.10 mi (6,960.57 km) |
