| Trier to Orzesze | 538.39 mi (866.45 km) |
| Trier to Osowa | 595.75 mi (958.77 km) |
| Trier to Ostroda | 630.70 mi (1,015.02 km) |
| Trier to Ostroleka | 681.12 mi (1,096.16 km) |
| Trier to Ostrow Mazowiecka | 690.64 mi (1,111.48 km) |
| Trier to Ostrow Wielkopolski | 505.63 mi (813.73 km) |
| Trier to Ostrowiec Swietokrzyski | 654.69 mi (1,053.61 km) |
| Trier to Ostrzeszow | 507.90 mi (817.39 km) |
| Trier to Oswiecim | 559.57 mi (900.55 km) |
| Trier to Otwock | 656.09 mi (1,055.88 km) |
| Trier to Ozarow Mazowiecki | 637.68 mi (1,026.24 km) |
| Trier to Ozimek | 514.99 mi (828.79 km) |
| Trier to Ozorkow | 571.25 mi (919.34 km) |
| Trier to Pabianice | 571.91 mi (920.40 km) |
| Trier to Parczew | 720.30 mi (1,159.21 km) |
