| Great Neck to Oerlinghausen | 3,786.56 mi (6,093.89 km) |
| Great Neck to Oestrich-Winkel | 3,814.80 mi (6,139.33 km) |
| Great Neck to Offenburg | 3,856.27 mi (6,206.07 km) |
| Great Neck to Oftersheim | 3,856.65 mi (6,206.68 km) |
| Great Neck to Ohrdruf | 3,900.12 mi (6,276.64 km) |
| Great Neck to Ohringen | 3,898.99 mi (6,274.82 km) |
| Great Neck to Olbernhau | 4,007.10 mi (6,448.81 km) |
| Great Neck to Olching | 4,003.89 mi (6,443.64 km) |
| Great Neck to Oldenburg | 3,737.50 mi (6,014.92 km) |
| Great Neck to Oldenburg in Holstein | 3,807.24 mi (6,127.16 km) |
| Great Neck to Olfen | 3,742.90 mi (6,023.62 km) |
| Great Neck to Olpe | 3,779.72 mi (6,082.87 km) |
| Great Neck to Olsberg | 3,796.33 mi (6,109.61 km) |
| Great Neck to Oranienburg | 3,939.45 mi (6,339.93 km) |
| Great Neck to Ortenberg | 3,847.17 mi (6,191.42 km) |
