| Callaway to Oerlinghausen | 4,776.68 mi (7,687.32 km) |
| Callaway to Oestrich-Winkel | 4,802.46 mi (7,728.81 km) |
| Callaway to Offenburg | 4,841.24 mi (7,791.23 km) |
| Callaway to Oftersheim | 4,843.59 mi (7,795.01 km) |
| Callaway to Ohrdruf | 4,889.74 mi (7,869.27 km) |
| Callaway to Ohringen | 4,886.09 mi (7,863.40 km) |
| Callaway to Olbernhau | 4,997.25 mi (8,042.30 km) |
| Callaway to Olching | 4,990.31 mi (8,031.13 km) |
| Callaway to Oldenburg | 4,728.26 mi (7,609.41 km) |
| Callaway to Oldenburg in Holstein | 4,798.25 mi (7,722.04 km) |
| Callaway to Olfen | 4,732.49 mi (7,616.21 km) |
| Callaway to Olpe | 4,768.68 mi (7,674.44 km) |
| Callaway to Olsberg | 4,785.85 mi (7,702.07 km) |
| Callaway to Oranienburg | 4,930.48 mi (7,934.84 km) |
| Callaway to Ortenberg | 4,835.73 mi (7,782.35 km) |
