| South Bend to Oerlinghausen | 4,217.75 mi (6,787.82 km) |
| South Bend to Oestrich-Winkel | 4,265.16 mi (6,864.12 km) |
| South Bend to Offenburg | 4,319.67 mi (6,951.84 km) |
| South Bend to Oftersheim | 4,310.60 mi (6,937.24 km) |
| South Bend to Ohrdruf | 4,335.17 mi (6,976.78 km) |
| South Bend to Ohringen | 4,351.58 mi (7,003.18 km) |
| South Bend to Olbernhau | 4,435.36 mi (7,138.03 km) |
| South Bend to Olching | 4,458.92 mi (7,175.94 km) |
| South Bend to Oldenburg | 4,159.22 mi (6,693.62 km) |
| South Bend to Oldenburg in Holstein | 4,210.64 mi (6,776.37 km) |
| South Bend to Olfen | 4,180.00 mi (6,727.05 km) |
| South Bend to Olpe | 4,221.75 mi (6,794.26 km) |
| South Bend to Olsberg | 4,233.54 mi (6,813.23 km) |
| South Bend to Oranienburg | 4,349.93 mi (7,000.54 km) |
| South Bend to Ortenberg | 4,291.35 mi (6,906.26 km) |
