| Gainsborough to Nottingham | 34.68 mi (55.82 km) |
| Gainsborough to Nuneaton | 67.24 mi (108.21 km) |
| Gainsborough to Oadby | 56.89 mi (91.55 km) |
| Gainsborough to Oakengates | 85.08 mi (136.93 km) |
| Gainsborough to Oakham | 50.54 mi (81.34 km) |
| Gainsborough to Oldbury | 80.70 mi (129.88 km) |
| Gainsborough to Oldham | 56.13 mi (90.34 km) |
| Gainsborough to Ollerton | 17.26 mi (27.78 km) |
| Gainsborough to Olton | 79.28 mi (127.59 km) |
| Gainsborough to Omagh | 277.01 mi (445.81 km) |
| Gainsborough to Ormesby | 81.01 mi (130.37 km) |
| Gainsborough to Ormskirk | 87.64 mi (141.05 km) |
| Gainsborough to Orpington | 144.83 mi (233.08 km) |
| Gainsborough to Ossett | 38.31 mi (61.65 km) |
| Gainsborough to Oswaldtwistle | 70.52 mi (113.49 km) |
