| Tonawanda to Oerlinghausen | 3,881.76 mi (6,247.09 km) |
| Tonawanda to Oestrich-Winkel | 3,921.86 mi (6,311.62 km) |
| Tonawanda to Offenburg | 3,971.58 mi (6,391.65 km) |
| Tonawanda to Oftersheim | 3,966.03 mi (6,382.72 km) |
| Tonawanda to Ohrdruf | 3,997.96 mi (6,434.09 km) |
| Tonawanda to Ohringen | 4,007.62 mi (6,449.64 km) |
| Tonawanda to Olbernhau | 4,101.08 mi (6,600.05 km) |
| Tonawanda to Olching | 4,114.28 mi (6,621.29 km) |
| Tonawanda to Oldenburg | 3,826.84 mi (6,158.70 km) |
| Tonawanda to Oldenburg in Holstein | 3,885.84 mi (6,253.66 km) |
| Tonawanda to Olfen | 3,841.60 mi (6,182.45 km) |
| Tonawanda to Olpe | 3,881.54 mi (6,246.74 km) |
| Tonawanda to Olsberg | 3,895.23 mi (6,268.77 km) |
| Tonawanda to Oranienburg | 4,022.61 mi (6,473.77 km) |
| Tonawanda to Ortenberg | 3,950.48 mi (6,357.68 km) |
