| Markham to Oberkirch | 4,380.81 mi (7,050.24 km) |
| Markham to Obernburg am Main | 4,370.44 mi (7,033.54 km) |
| Markham to Obernkirchen | 4,277.72 mi (6,884.32 km) |
| Markham to Oberschleissheim | 4,523.30 mi (7,279.54 km) |
| Markham to Oberstdorf | 4,508.49 mi (7,255.72 km) |
| Markham to Obertraubling | 4,516.59 mi (7,268.75 km) |
| Markham to Obertshausen | 4,350.36 mi (7,001.22 km) |
| Markham to Oberursel | 4,335.68 mi (6,977.61 km) |
| Markham to Ochsenfurt | 4,412.01 mi (7,100.45 km) |
| Markham to Ochsenhausen | 4,469.56 mi (7,193.06 km) |
| Markham to Ochtrup | 4,210.87 mi (6,776.74 km) |
| Markham to Odenthal | 4,250.85 mi (6,841.08 km) |
| Markham to Oelde | 4,259.10 mi (6,854.37 km) |
| Markham to Oelsnitz | 4,458.25 mi (7,174.87 km) |
| Markham to Oer-Erkenschwick | 4,233.51 mi (6,813.17 km) |
