| Middlesex to Opole | 4,224.49 mi (6,798.65 km) |
| Middlesex to Orzesze | 4,273.55 mi (6,877.62 km) |
| Middlesex to Osowa | 4,117.47 mi (6,626.43 km) |
| Middlesex to Ostroda | 4,194.90 mi (6,751.05 km) |
| Middlesex to Ostroleka | 4,273.92 mi (6,878.21 km) |
| Middlesex to Ostrow Mazowiecka | 4,295.34 mi (6,912.68 km) |
| Middlesex to Ostrow Wielkopolski | 4,186.47 mi (6,737.47 km) |
| Middlesex to Ostrowiec Swietokrzyski | 4,344.88 mi (6,992.40 km) |
| Middlesex to Ostrzeszow | 4,198.76 mi (6,757.25 km) |
| Middlesex to Oswiecim | 4,295.45 mi (6,912.87 km) |
| Middlesex to Otwock | 4,297.14 mi (6,915.57 km) |
| Middlesex to Ozarow Mazowiecki | 4,276.63 mi (6,882.58 km) |
| Middlesex to Ozimek | 4,234.87 mi (6,815.37 km) |
| Middlesex to Ozorkow | 4,229.98 mi (6,807.49 km) |
| Middlesex to Pabianice | 4,244.69 mi (6,831.17 km) |
