| Castellana Grotte to Oerlinghausen | 864.84 mi (1,391.82 km) |
| Castellana Grotte to Oestrich-Winkel | 769.63 mi (1,238.60 km) |
| Castellana Grotte to Offenburg | 692.06 mi (1,113.76 km) |
| Castellana Grotte to Oftersheim | 719.34 mi (1,157.67 km) |
| Castellana Grotte to Ohrdruf | 752.95 mi (1,211.75 km) |
| Castellana Grotte to Ohringen | 684.98 mi (1,102.37 km) |
| Castellana Grotte to Olbernhau | 700.50 mi (1,127.35 km) |
| Castellana Grotte to Olching | 581.45 mi (935.75 km) |
| Castellana Grotte to Oldenburg | 944.61 mi (1,520.20 km) |
| Castellana Grotte to Oldenburg in Holstein | 971.19 mi (1,562.98 km) |
| Castellana Grotte to Olfen | 880.52 mi (1,417.05 km) |
| Castellana Grotte to Olpe | 829.95 mi (1,335.67 km) |
| Castellana Grotte to Olsberg | 832.91 mi (1,340.44 km) |
| Castellana Grotte to Oranienburg | 840.67 mi (1,352.92 km) |
| Castellana Grotte to Ortenberg | 761.86 mi (1,226.09 km) |
