| Portchester to Norwich | 160.91 mi (258.95 km) |
| Portchester to Nottingham | 145.88 mi (234.77 km) |
| Portchester to Nuneaton | 117.10 mi (188.45 km) |
| Portchester to Oadby | 121.39 mi (195.36 km) |
| Portchester to Oakengates | 140.10 mi (225.47 km) |
| Portchester to Oakham | 127.41 mi (205.05 km) |
| Portchester to Oldbury | 121.14 mi (194.96 km) |
| Portchester to Oldham | 191.43 mi (308.07 km) |
| Portchester to Ollerton | 162.98 mi (262.29 km) |
| Portchester to Olton | 114.11 mi (183.63 km) |
| Portchester to Omagh | 365.46 mi (588.15 km) |
| Portchester to Ormesby | 256.16 mi (412.24 km) |
| Portchester to Ormskirk | 202.55 mi (325.98 km) |
| Portchester to Orpington | 64.39 mi (103.62 km) |
| Portchester to Ossett | 197.05 mi (317.12 km) |
