| Castle Rock to Norwich | 4,702.22 mi (7,567.49 km) |
| Castle Rock to Nottingham | 4,606.44 mi (7,413.36 km) |
| Castle Rock to Nuneaton | 4,612.66 mi (7,423.35 km) |
| Castle Rock to Oadby | 4,623.09 mi (7,440.14 km) |
| Castle Rock to Oakengates | 4,571.99 mi (7,357.91 km) |
| Castle Rock to Oakham | 4,631.94 mi (7,454.39 km) |
| Castle Rock to Oldbury | 4,594.47 mi (7,394.09 km) |
| Castle Rock to Oldham | 4,550.33 mi (7,323.05 km) |
| Castle Rock to Ollerton | 4,601.05 mi (7,404.68 km) |
| Castle Rock to Olton | 4,604.39 mi (7,410.05 km) |
| Castle Rock to Omagh | 4,334.56 mi (6,975.80 km) |
| Castle Rock to Ormesby | 4,542.40 mi (7,310.29 km) |
| Castle Rock to Ormskirk | 4,523.28 mi (7,279.52 km) |
| Castle Rock to Orpington | 4,713.19 mi (7,585.14 km) |
| Castle Rock to Ossett | 4,563.18 mi (7,343.73 km) |
