| Grantham to Opole | 806.34 mi (1,297.68 km) |
| Grantham to Orzesze | 852.11 mi (1,371.34 km) |
| Grantham to Osowa | 786.57 mi (1,265.87 km) |
| Grantham to Ostroda | 849.35 mi (1,366.89 km) |
| Grantham to Ostroleka | 919.82 mi (1,480.31 km) |
| Grantham to Ostrow Mazowiecka | 936.38 mi (1,506.97 km) |
| Grantham to Ostrow Wielkopolski | 782.74 mi (1,259.70 km) |
| Grantham to Ostrowiec Swietokrzyski | 945.13 mi (1,521.04 km) |
| Grantham to Ostrzeszow | 791.57 mi (1,273.90 km) |
| Grantham to Oswiecim | 874.39 mi (1,407.20 km) |
| Grantham to Otwock | 919.05 mi (1,479.07 km) |
| Grantham to Ozarow Mazowiecki | 898.28 mi (1,445.64 km) |
| Grantham to Ozimek | 817.84 mi (1,316.18 km) |
| Grantham to Ozorkow | 838.87 mi (1,350.03 km) |
| Grantham to Pabianice | 847.98 mi (1,364.70 km) |
