| South San Francisco to Oerlinghausen | 5,579.88 mi (8,979.95 km) |
| South San Francisco to Oestrich-Winkel | 5,670.33 mi (9,125.51 km) |
| South San Francisco to Offenburg | 5,752.60 mi (9,257.92 km) |
| South San Francisco to Oftersheim | 5,720.76 mi (9,206.68 km) |
| South San Francisco to Ohrdruf | 5,696.05 mi (9,166.91 km) |
| South San Francisco to Ohringen | 5,754.87 mi (9,261.56 km) |
| South San Francisco to Olbernhau | 5,769.95 mi (9,285.84 km) |
| South San Francisco to Olching | 5,859.32 mi (9,429.67 km) |
| South San Francisco to Oldenburg | 5,503.72 mi (8,857.39 km) |
| South San Francisco to Oldenburg in Holstein | 5,505.02 mi (8,859.48 km) |
| South San Francisco to Olfen | 5,560.10 mi (8,948.12 km) |
| South San Francisco to Olpe | 5,610.19 mi (9,028.73 km) |
| South San Francisco to Olsberg | 5,609.05 mi (9,026.89 km) |
| South San Francisco to Oranienburg | 5,647.90 mi (9,089.42 km) |
| South San Francisco to Ortenberg | 5,678.92 mi (9,139.33 km) |
