| Rockville Centre to Oerlinghausen | 3,789.21 mi (6,098.15 km) |
| Rockville Centre to Oestrich-Winkel | 3,817.01 mi (6,142.88 km) |
| Rockville Centre to Offenburg | 3,858.16 mi (6,209.11 km) |
| Rockville Centre to Oftersheim | 3,858.77 mi (6,210.08 km) |
| Rockville Centre to Ohrdruf | 3,902.66 mi (6,280.72 km) |
| Rockville Centre to Ohringen | 3,901.13 mi (6,278.26 km) |
| Rockville Centre to Olbernhau | 4,009.77 mi (6,453.10 km) |
| Rockville Centre to Olching | 4,005.95 mi (6,446.95 km) |
| Rockville Centre to Oldenburg | 3,740.37 mi (6,019.54 km) |
| Rockville Centre to Oldenburg in Holstein | 3,810.48 mi (6,132.37 km) |
| Rockville Centre to Olfen | 3,745.43 mi (6,027.69 km) |
| Rockville Centre to Olpe | 3,782.13 mi (6,086.75 km) |
| Rockville Centre to Olsberg | 3,798.85 mi (6,113.65 km) |
| Rockville Centre to Oranienburg | 3,942.51 mi (6,344.85 km) |
| Rockville Centre to Ortenberg | 3,849.51 mi (6,195.19 km) |
