| Niagara Falls to Oststeinbek | 3,885.94 mi (6,253.81 km) |
| Niagara Falls to Ottendorf-Okrilla | 4,101.67 mi (6,601.00 km) |
| Niagara Falls to Ottersberg | 3,863.62 mi (6,217.90 km) |
| Niagara Falls to Ottobrunn | 4,134.50 mi (6,653.84 km) |
| Niagara Falls to Ottweiler | 3,912.36 mi (6,296.34 km) |
| Niagara Falls to Overath | 3,864.79 mi (6,219.78 km) |
| Niagara Falls to Oyten | 3,860.06 mi (6,212.16 km) |
| Niagara Falls to Paderborn | 3,894.52 mi (6,267.62 km) |
| Niagara Falls to Papenburg | 3,800.38 mi (6,116.12 km) |
| Niagara Falls to Parchim | 3,950.10 mi (6,357.07 km) |
| Niagara Falls to Pasewalk | 4,024.15 mi (6,476.24 km) |
| Niagara Falls to Passau | 4,185.02 mi (6,735.14 km) |
| Niagara Falls to Pattensen | 3,913.89 mi (6,298.80 km) |
| Niagara Falls to Pegnitz | 4,068.08 mi (6,546.95 km) |
| Niagara Falls to Peine | 3,929.31 mi (6,323.61 km) |
