| Crystal to Oerlinghausen | 4,296.63 mi (6,914.76 km) |
| Crystal to Oestrich-Winkel | 4,359.22 mi (7,015.48 km) |
| Crystal to Offenburg | 4,423.99 mi (7,119.72 km) |
| Crystal to Oftersheim | 4,406.99 mi (7,092.36 km) |
| Crystal to Ohrdruf | 4,415.38 mi (7,105.88 km) |
| Crystal to Ohringen | 4,446.20 mi (7,155.47 km) |
| Crystal to Olbernhau | 4,508.46 mi (7,255.67 km) |
| Crystal to Olching | 4,554.06 mi (7,329.05 km) |
| Crystal to Oldenburg | 4,231.36 mi (6,809.71 km) |
| Crystal to Oldenburg in Holstein | 4,267.26 mi (6,867.50 km) |
| Crystal to Olfen | 4,264.33 mi (6,862.78 km) |
| Crystal to Olpe | 4,309.52 mi (6,935.50 km) |
| Crystal to Olsberg | 4,317.13 mi (6,947.75 km) |
| Crystal to Oranienburg | 4,409.94 mi (7,097.11 km) |
| Crystal to Ortenberg | 4,379.82 mi (7,048.65 km) |
