| Barreiro to Nottingham | 1,056.63 mi (1,700.49 km) |
| Barreiro to Nuneaton | 1,024.06 mi (1,648.07 km) |
| Barreiro to Oadby | 1,035.60 mi (1,666.64 km) |
| Barreiro to Oakengates | 1,019.45 mi (1,640.65 km) |
| Barreiro to Oakham | 1,046.22 mi (1,683.74 km) |
| Barreiro to Oldbury | 1,013.91 mi (1,631.73 km) |
| Barreiro to Oldham | 1,079.26 mi (1,736.90 km) |
| Barreiro to Ollerton | 1,074.40 mi (1,729.08 km) |
| Barreiro to Olton | 1,013.01 mi (1,630.29 km) |
| Barreiro to Omagh | 1,103.33 mi (1,775.63 km) |
| Barreiro to Ormesby | 1,157.70 mi (1,863.14 km) |
| Barreiro to Ormskirk | 1,070.18 mi (1,722.28 km) |
| Barreiro to Orpington | 983.73 mi (1,583.17 km) |
| Barreiro to Ossett | 1,095.95 mi (1,763.76 km) |
| Barreiro to Oswaldtwistle | 1,088.28 mi (1,751.41 km) |
