| Chelmsford to Opole | 757.38 mi (1,218.89 km) |
| Chelmsford to Orzesze | 800.74 mi (1,288.66 km) |
| Chelmsford to Osowa | 767.29 mi (1,234.84 km) |
| Chelmsford to Ostroda | 824.19 mi (1,326.41 km) |
| Chelmsford to Ostroleka | 890.50 mi (1,433.13 km) |
| Chelmsford to Ostrow Mazowiecka | 905.39 mi (1,457.09 km) |
| Chelmsford to Ostrow Wielkopolski | 740.83 mi (1,192.25 km) |
| Chelmsford to Ostrowiec Swietokrzyski | 901.69 mi (1,451.13 km) |
| Chelmsford to Ostrzeszow | 748.01 mi (1,203.81 km) |
| Chelmsford to Oswiecim | 822.93 mi (1,324.37 km) |
| Chelmsford to Otwock | 883.11 mi (1,421.23 km) |
| Chelmsford to Ozarow Mazowiecki | 862.71 mi (1,388.39 km) |
| Chelmsford to Ozimek | 769.26 mi (1,238.00 km) |
| Chelmsford to Ozorkow | 800.49 mi (1,288.27 km) |
| Chelmsford to Pabianice | 807.42 mi (1,299.41 km) |
