| North Tonawanda to Orbetello | 4,326.69 mi (6,963.13 km) |
| North Tonawanda to Oria | 4,673.57 mi (7,521.39 km) |
| North Tonawanda to Oristano | 4,313.80 mi (6,942.39 km) |
| North Tonawanda to Orta Nova | 4,559.08 mi (7,337.12 km) |
| North Tonawanda to Orte | 4,374.95 mi (7,040.80 km) |
| North Tonawanda to Ortona | 4,462.89 mi (7,182.33 km) |
| North Tonawanda to Orvieto | 4,353.23 mi (7,005.84 km) |
| North Tonawanda to Orzinuovi | 4,160.35 mi (6,695.44 km) |
| North Tonawanda to Osimo | 4,379.54 mi (7,048.19 km) |
| North Tonawanda to Ospitaletto | 4,160.27 mi (6,695.31 km) |
| North Tonawanda to Ostuni | 4,661.54 mi (7,502.03 km) |
| North Tonawanda to Ottaviano | 4,527.65 mi (7,286.55 km) |
| North Tonawanda to Ovada | 4,135.63 mi (6,655.65 km) |
| North Tonawanda to Ozieri | 4,305.12 mi (6,928.43 km) |
| North Tonawanda to Paceco | 4,564.00 mi (7,345.05 km) |
