| Romanshorn to Orthez | 564.68 mi (908.77 km) |
| Romanshorn to Orvault | 513.25 mi (826.00 km) |
| Romanshorn to Osny | 350.58 mi (564.20 km) |
| Romanshorn to Ostwald | 102.03 mi (164.21 km) |
| Romanshorn to Ouistreham | 456.17 mi (734.14 km) |
| Romanshorn to Oullins | 250.66 mi (403.40 km) |
| Romanshorn to Outreau | 412.27 mi (663.48 km) |
| Romanshorn to Oyonnax | 196.63 mi (316.44 km) |
| Romanshorn to Ozoir-la-Ferriere | 318.76 mi (513.00 km) |
| Romanshorn to Pace | 517.14 mi (832.26 km) |
| Romanshorn to Palaiseau | 337.23 mi (542.71 km) |
| Romanshorn to Pamiers | 485.30 mi (781.02 km) |
| Romanshorn to Panazol | 399.24 mi (642.52 km) |
| Romanshorn to Pantin | 332.95 mi (535.83 km) |
| Romanshorn to Paray-le-Monial | 258.37 mi (415.81 km) |
