| San Gwann to Oerlinghausen | 1,145.59 mi (1,843.65 km) |
| San Gwann to Oestrich-Winkel | 1,026.23 mi (1,651.56 km) |
| San Gwann to Offenburg | 929.21 mi (1,495.42 km) |
| San Gwann to Oftersheim | 976.36 mi (1,571.30 km) |
| San Gwann to Ohrdruf | 1,047.46 mi (1,685.72 km) |
| San Gwann to Ohringen | 952.07 mi (1,532.20 km) |
| San Gwann to Olbernhau | 1,021.22 mi (1,643.50 km) |
| San Gwann to Olching | 864.35 mi (1,391.04 km) |
| San Gwann to Oldenburg | 1,228.96 mi (1,977.82 km) |
| San Gwann to Oldenburg in Holstein | 1,282.29 mi (2,063.64 km) |
| San Gwann to Olfen | 1,146.70 mi (1,845.44 km) |
| San Gwann to Olpe | 1,094.60 mi (1,761.60 km) |
| San Gwann to Olsberg | 1,107.24 mi (1,781.93 km) |
| San Gwann to Oranienburg | 1,165.45 mi (1,875.61 km) |
| San Gwann to Ortenberg | 1,034.22 mi (1,664.41 km) |
