| Sumner to Oerlinghausen | 4,995.13 mi (8,038.88 km) |
| Sumner to Oestrich-Winkel | 5,093.89 mi (8,197.83 km) |
| Sumner to Offenburg | 5,181.53 mi (8,338.86 km) |
| Sumner to Oftersheim | 5,144.61 mi (8,279.46 km) |
| Sumner to Ohrdruf | 5,108.96 mi (8,222.07 km) |
| Sumner to Ohringen | 5,176.45 mi (8,330.69 km) |
| Sumner to Olbernhau | 5,175.98 mi (8,329.93 km) |
| Sumner to Olching | 5,278.36 mi (8,494.70 km) |
| Sumner to Oldenburg | 4,916.48 mi (7,912.31 km) |
| Sumner to Oldenburg in Holstein | 4,907.43 mi (7,897.75 km) |
| Sumner to Olfen | 4,979.79 mi (8,014.19 km) |
| Sumner to Olpe | 5,030.89 mi (8,096.44 km) |
| Sumner to Olsberg | 5,026.78 mi (8,089.82 km) |
| Sumner to Oranienburg | 5,048.61 mi (8,124.96 km) |
| Sumner to Ortenberg | 5,098.16 mi (8,204.69 km) |
