| Niagara Falls to Norwich | 3,583.33 mi (5,766.81 km) |
| Niagara Falls to Nottingham | 3,480.58 mi (5,601.46 km) |
| Niagara Falls to Nuneaton | 3,479.45 mi (5,599.63 km) |
| Niagara Falls to Oadby | 3,492.69 mi (5,620.94 km) |
| Niagara Falls to Oakengates | 3,436.74 mi (5,530.90 km) |
| Niagara Falls to Oakham | 3,504.09 mi (5,639.29 km) |
| Niagara Falls to Oldbury | 3,458.56 mi (5,566.01 km) |
| Niagara Falls to Oldham | 3,428.42 mi (5,517.51 km) |
| Niagara Falls to Ollerton | 3,479.20 mi (5,599.24 km) |
| Niagara Falls to Olton | 3,468.50 mi (5,582.01 km) |
| Niagara Falls to Omagh | 3,206.64 mi (5,160.58 km) |
| Niagara Falls to Ormesby | 3,439.12 mi (5,534.73 km) |
| Niagara Falls to Ormskirk | 3,398.32 mi (5,469.07 km) |
| Niagara Falls to Orpington | 3,571.94 mi (5,748.48 km) |
| Niagara Falls to Ossett | 3,445.58 mi (5,545.12 km) |
