| Romulus to Orthez | 3,998.94 mi (6,435.67 km) |
| Romulus to Orvault | 3,837.52 mi (6,175.90 km) |
| Romulus to Osny | 3,930.39 mi (6,325.36 km) |
| Romulus to Ostwald | 4,170.79 mi (6,712.23 km) |
| Romulus to Ouistreham | 3,830.38 mi (6,164.40 km) |
| Romulus to Oullins | 4,156.74 mi (6,689.63 km) |
| Romulus to Outreau | 3,859.28 mi (6,210.92 km) |
| Romulus to Oyonnax | 4,171.88 mi (6,713.98 km) |
| Romulus to Ozoir-la-Ferriere | 3,964.30 mi (6,379.93 km) |
| Romulus to Pace | 3,803.80 mi (6,121.63 km) |
| Romulus to Palaiseau | 3,949.03 mi (6,355.35 km) |
| Romulus to Pamiers | 4,115.13 mi (6,622.67 km) |
| Romulus to Panazol | 4,007.17 mi (6,448.92 km) |
| Romulus to Pantin | 3,949.27 mi (6,355.73 km) |
| Romulus to Paray-le-Monial | 4,102.21 mi (6,601.87 km) |
