| Tralee to Oerlinghausen | 777.27 mi (1,250.89 km) |
| Tralee to Oestrich-Winkel | 780.98 mi (1,256.87 km) |
| Tralee to Offenburg | 817.70 mi (1,315.96 km) |
| Tralee to Oftersheim | 820.27 mi (1,320.09 km) |
| Tralee to Ohrdruf | 880.40 mi (1,416.87 km) |
| Tralee to Ohringen | 862.98 mi (1,388.84 km) |
| Tralee to Olbernhau | 993.14 mi (1,598.30 km) |
| Tralee to Olching | 966.33 mi (1,555.15 km) |
| Tralee to Oldenburg | 750.26 mi (1,207.42 km) |
| Tralee to Oldenburg in Holstein | 858.42 mi (1,381.50 km) |
| Tralee to Olfen | 725.96 mi (1,168.33 km) |
| Tralee to Olpe | 754.69 mi (1,214.55 km) |
| Tralee to Olsberg | 777.14 mi (1,250.69 km) |
| Tralee to Oranienburg | 960.86 mi (1,546.35 km) |
| Tralee to Ortenberg | 818.17 mi (1,316.72 km) |
