| Isernia to Orzesze | 628.85 mi (1,012.03 km) |
| Isernia to Osowa | 906.98 mi (1,459.65 km) |
| Isernia to Ostroda | 876.60 mi (1,410.75 km) |
| Isernia to Ostroleka | 862.11 mi (1,387.43 km) |
| Isernia to Ostrow Mazowiecka | 851.99 mi (1,371.15 km) |
| Isernia to Ostrow Wielkopolski | 714.37 mi (1,149.67 km) |
| Isernia to Ostrowiec Swietokrzyski | 728.96 mi (1,173.15 km) |
| Isernia to Ostrzeszow | 700.22 mi (1,126.89 km) |
| Isernia to Oswiecim | 629.90 mi (1,013.72 km) |
| Isernia to Otwock | 797.80 mi (1,283.94 km) |
| Isernia to Ozarow Mazowiecki | 795.24 mi (1,279.82 km) |
| Isernia to Ozimek | 654.68 mi (1,053.61 km) |
| Isernia to Ozorkow | 754.32 mi (1,213.96 km) |
| Isernia to Pabianice | 735.38 mi (1,183.48 km) |
| Isernia to Parczew | 803.67 mi (1,293.38 km) |
