| River Grove to Norwich | 3,970.32 mi (6,389.62 km) |
| River Grove to Nottingham | 3,869.30 mi (6,227.04 km) |
| River Grove to Nuneaton | 3,870.61 mi (6,229.14 km) |
| River Grove to Oadby | 3,882.99 mi (6,249.07 km) |
| River Grove to Oakengates | 3,828.34 mi (6,161.12 km) |
| River Grove to Oakham | 3,893.61 mi (6,266.16 km) |
| River Grove to Oldbury | 3,850.50 mi (6,196.78 km) |
| River Grove to Oldham | 3,815.51 mi (6,140.47 km) |
| River Grove to Ollerton | 3,866.58 mi (6,222.65 km) |
| River Grove to Olton | 3,860.49 mi (6,212.85 km) |
| River Grove to Omagh | 3,594.38 mi (5,784.60 km) |
| River Grove to Ormesby | 3,820.02 mi (6,147.73 km) |
| River Grove to Ormskirk | 3,786.25 mi (6,093.39 km) |
| River Grove to Orpington | 3,966.26 mi (6,383.08 km) |
| River Grove to Ossett | 3,831.33 mi (6,165.93 km) |
