| Niagara Falls to Nasaud | 4,645.48 mi (7,476.18 km) |
| Niagara Falls to Navodari | 4,932.67 mi (7,938.36 km) |
| Niagara Falls to Negresti-Oas | 4,584.40 mi (7,377.87 km) |
| Niagara Falls to Nehoiu | 4,800.92 mi (7,726.33 km) |
| Niagara Falls to Ocna Mures | 4,664.93 mi (7,507.47 km) |
| Niagara Falls to Odobesti | 4,809.67 mi (7,740.42 km) |
| Niagara Falls to Odorheiu Secuiesc | 4,720.97 mi (7,597.67 km) |
| Niagara Falls to Oltenita | 4,871.09 mi (7,839.26 km) |
| Niagara Falls to Onesti | 4,776.49 mi (7,687.02 km) |
| Niagara Falls to Oradea | 4,563.89 mi (7,344.88 km) |
| Niagara Falls to Orastie | 4,664.28 mi (7,506.43 km) |
| Niagara Falls to Oravita | 4,642.66 mi (7,471.64 km) |
| Niagara Falls to Orsova | 4,683.39 mi (7,537.19 km) |
| Niagara Falls to Otelu Rosu | 4,647.10 mi (7,478.78 km) |
| Niagara Falls to Otopeni | 4,828.89 mi (7,771.35 km) |
