| Brock Hall to Oberkirch | 4,069.17 mi (6,548.69 km) |
| Brock Hall to Obernburg am Main | 4,074.26 mi (6,556.89 km) |
| Brock Hall to Obernkirchen | 4,004.32 mi (6,444.33 km) |
| Brock Hall to Oberschleissheim | 4,221.24 mi (6,793.42 km) |
| Brock Hall to Oberstdorf | 4,194.49 mi (6,750.38 km) |
| Brock Hall to Obertraubling | 4,222.98 mi (6,796.23 km) |
| Brock Hall to Obertshausen | 4,055.25 mi (6,526.30 km) |
| Brock Hall to Oberursel | 4,041.00 mi (6,503.37 km) |
| Brock Hall to Ochsenfurt | 4,117.22 mi (6,626.03 km) |
| Brock Hall to Ochsenhausen | 4,160.20 mi (6,695.20 km) |
| Brock Hall to Ochtrup | 3,930.90 mi (6,326.17 km) |
| Brock Hall to Odenthal | 3,959.31 mi (6,371.90 km) |
| Brock Hall to Oelde | 3,978.49 mi (6,402.76 km) |
| Brock Hall to Oelsnitz | 4,177.65 mi (6,723.28 km) |
| Brock Hall to Oer-Erkenschwick | 3,948.25 mi (6,354.09 km) |
