| Castelli Calepio to Nottingham | 708.23 mi (1,139.78 km) |
| Castelli Calepio to Nuneaton | 699.44 mi (1,125.65 km) |
| Castelli Calepio to Oadby | 689.97 mi (1,110.41 km) |
| Castelli Calepio to Oakengates | 739.44 mi (1,190.02 km) |
| Castelli Calepio to Oakham | 682.26 mi (1,098.00 km) |
| Castelli Calepio to Oldbury | 716.96 mi (1,153.83 km) |
| Castelli Calepio to Oldham | 765.18 mi (1,231.44 km) |
| Castelli Calepio to Ollerton | 715.58 mi (1,151.61 km) |
| Castelli Calepio to Olton | 707.09 mi (1,137.95 km) |
| Castelli Calepio to Omagh | 976.88 mi (1,572.14 km) |
| Castelli Calepio to Ormesby | 785.99 mi (1,264.93 km) |
| Castelli Calepio to Ormskirk | 790.47 mi (1,272.14 km) |
| Castelli Calepio to Orpington | 597.98 mi (962.35 km) |
| Castelli Calepio to Ossett | 755.00 mi (1,215.05 km) |
| Castelli Calepio to Oswaldtwistle | 782.71 mi (1,259.64 km) |
