| Ridge to Oerlinghausen | 3,748.47 mi (6,032.57 km) |
| Ridge to Oestrich-Winkel | 3,775.72 mi (6,076.43 km) |
| Ridge to Offenburg | 3,816.53 mi (6,142.11 km) |
| Ridge to Oftersheim | 3,817.37 mi (6,143.47 km) |
| Ridge to Ohrdruf | 3,861.76 mi (6,214.91 km) |
| Ridge to Ohringen | 3,859.76 mi (6,211.68 km) |
| Ridge to Olbernhau | 3,969.03 mi (6,387.54 km) |
| Ridge to Olching | 3,964.49 mi (6,380.23 km) |
| Ridge to Oldenburg | 3,699.91 mi (5,954.44 km) |
| Ridge to Oldenburg in Holstein | 3,770.58 mi (6,068.15 km) |
| Ridge to Olfen | 3,704.53 mi (5,961.86 km) |
| Ridge to Olpe | 3,741.08 mi (6,020.68 km) |
| Ridge to Olsberg | 3,757.92 mi (6,047.79 km) |
| Ridge to Oranienburg | 3,902.33 mi (6,280.19 km) |
| Ridge to Ortenberg | 3,808.38 mi (6,129.00 km) |
