| Cave Spring to Oerlinghausen | 4,200.94 mi (6,760.75 km) |
| Cave Spring to Oestrich-Winkel | 4,230.93 mi (6,809.02 km) |
| Cave Spring to Offenburg | 4,273.23 mi (6,877.11 km) |
| Cave Spring to Oftersheim | 4,273.06 mi (6,876.82 km) |
| Cave Spring to Ohrdruf | 4,314.99 mi (6,944.31 km) |
| Cave Spring to Ohringen | 4,315.33 mi (6,944.85 km) |
| Cave Spring to Olbernhau | 4,421.38 mi (7,115.53 km) |
| Cave Spring to Olching | 4,420.46 mi (7,114.04 km) |
| Cave Spring to Oldenburg | 4,150.74 mi (6,679.97 km) |
| Cave Spring to Oldenburg in Holstein | 4,218.13 mi (6,788.42 km) |
| Cave Spring to Olfen | 4,157.83 mi (6,691.38 km) |
| Cave Spring to Olpe | 4,195.14 mi (6,751.43 km) |
| Cave Spring to Olsberg | 4,211.32 mi (6,777.47 km) |
| Cave Spring to Oranienburg | 4,351.51 mi (7,003.07 km) |
| Cave Spring to Ortenberg | 4,262.83 mi (6,860.36 km) |
