| Isernia to Orthez | 774.01 mi (1,245.65 km) |
| Isernia to Orvault | 872.88 mi (1,404.77 km) |
| Isernia to Osny | 782.69 mi (1,259.61 km) |
| Isernia to Ostwald | 575.60 mi (926.33 km) |
| Isernia to Ouistreham | 878.03 mi (1,413.05 km) |
| Isernia to Oullins | 549.90 mi (884.98 km) |
| Isernia to Outreau | 870.47 mi (1,400.88 km) |
| Isernia to Oyonnax | 534.12 mi (859.58 km) |
| Isernia to Ozoir-la-Ferriere | 748.60 mi (1,204.75 km) |
| Isernia to Pace | 902.55 mi (1,452.52 km) |
| Isernia to Palaiseau | 761.92 mi (1,226.19 km) |
| Isernia to Pamiers | 652.55 mi (1,050.17 km) |
| Isernia to Panazol | 707.79 mi (1,139.07 km) |
| Isernia to Pantin | 763.64 mi (1,228.96 km) |
| Isernia to Paray-le-Monial | 603.40 mi (971.09 km) |
