| Difficult Run to Opole | 4,413.32 mi (7,102.56 km) |
| Difficult Run to Orzesze | 4,462.47 mi (7,181.65 km) |
| Difficult Run to Osowa | 4,304.27 mi (6,927.05 km) |
| Difficult Run to Ostroda | 4,381.84 mi (7,051.89 km) |
| Difficult Run to Ostroleka | 4,460.89 mi (7,179.12 km) |
| Difficult Run to Ostrow Mazowiecka | 4,482.40 mi (7,213.73 km) |
| Difficult Run to Ostrow Wielkopolski | 4,374.90 mi (7,040.72 km) |
| Difficult Run to Ostrowiec Swietokrzyski | 4,533.02 mi (7,295.19 km) |
| Difficult Run to Ostrzeszow | 4,387.28 mi (7,060.64 km) |
| Difficult Run to Oswiecim | 4,484.35 mi (7,216.86 km) |
| Difficult Run to Otwock | 4,484.71 mi (7,217.44 km) |
| Difficult Run to Ozarow Mazowiecki | 4,464.25 mi (7,184.51 km) |
| Difficult Run to Ozimek | 4,423.67 mi (7,119.20 km) |
| Difficult Run to Ozorkow | 4,418.01 mi (7,110.09 km) |
| Difficult Run to Pabianice | 4,432.86 mi (7,134.00 km) |
