| Brock Hall to Oerlinghausen | 3,995.05 mi (6,429.42 km) |
| Brock Hall to Oestrich-Winkel | 4,023.49 mi (6,475.19 km) |
| Brock Hall to Offenburg | 4,064.89 mi (6,541.81 km) |
| Brock Hall to Oftersheim | 4,065.34 mi (6,542.54 km) |
| Brock Hall to Ohrdruf | 4,108.70 mi (6,612.31 km) |
| Brock Hall to Ohringen | 4,107.68 mi (6,610.68 km) |
| Brock Hall to Olbernhau | 4,215.58 mi (6,784.32 km) |
| Brock Hall to Olching | 4,212.58 mi (6,779.49 km) |
| Brock Hall to Oldenburg | 3,945.75 mi (6,350.07 km) |
| Brock Hall to Oldenburg in Holstein | 4,014.88 mi (6,461.33 km) |
| Brock Hall to Olfen | 3,951.48 mi (6,359.30 km) |
| Brock Hall to Olpe | 3,988.37 mi (6,418.66 km) |
| Brock Hall to Olsberg | 4,004.92 mi (6,445.30 km) |
| Brock Hall to Oranienburg | 4,147.42 mi (6,674.62 km) |
| Brock Hall to Ortenberg | 4,055.84 mi (6,527.24 km) |
