| Castel San Giorgio to Nottingham | 1,120.89 mi (1,803.89 km) |
| Castel San Giorgio to Nuneaton | 1,111.23 mi (1,788.36 km) |
| Castel San Giorgio to Oadby | 1,102.24 mi (1,773.88 km) |
| Castel San Giorgio to Oakengates | 1,150.58 mi (1,851.68 km) |
| Castel San Giorgio to Oakham | 1,094.86 mi (1,762.01 km) |
| Castel San Giorgio to Oldbury | 1,128.13 mi (1,815.55 km) |
| Castel San Giorgio to Oldham | 1,177.92 mi (1,895.67 km) |
| Castel San Giorgio to Ollerton | 1,128.48 mi (1,816.12 km) |
| Castel San Giorgio to Olton | 1,118.34 mi (1,799.80 km) |
| Castel San Giorgio to Omagh | 1,387.69 mi (2,233.27 km) |
| Castel San Giorgio to Ormesby | 1,198.62 mi (1,928.99 km) |
| Castel San Giorgio to Ormskirk | 1,202.81 mi (1,935.74 km) |
| Castel San Giorgio to Orpington | 1,008.92 mi (1,623.69 km) |
| Castel San Giorgio to Ossett | 1,167.98 mi (1,879.68 km) |
| Castel San Giorgio to Oswaldtwistle | 1,195.48 mi (1,923.95 km) |
