| Irmo to Opole | 4,801.21 mi (7,726.81 km) |
| Irmo to Orzesze | 4,850.11 mi (7,805.49 km) |
| Irmo to Osowa | 4,696.03 mi (7,557.53 km) |
| Irmo to Ostroda | 4,773.42 mi (7,682.08 km) |
| Irmo to Ostroleka | 4,852.42 mi (7,809.22 km) |
| Irmo to Ostrow Mazowiecka | 4,873.82 mi (7,843.65 km) |
| Irmo to Ostrow Wielkopolski | 4,763.86 mi (7,666.70 km) |
| Irmo to Ostrowiec Swietokrzyski | 4,922.61 mi (7,922.18 km) |
| Irmo to Ostrzeszow | 4,776.03 mi (7,686.27 km) |
| Irmo to Oswiecim | 4,872.06 mi (7,840.83 km) |
| Irmo to Otwock | 4,875.36 mi (7,846.13 km) |
| Irmo to Ozarow Mazowiecki | 4,854.83 mi (7,813.10 km) |
| Irmo to Ozimek | 4,811.68 mi (7,743.66 km) |
| Irmo to Ozorkow | 4,807.84 mi (7,737.46 km) |
| Irmo to Pabianice | 4,822.41 mi (7,760.92 km) |
