| McHenry to Oberkirch | 4,369.13 mi (7,031.44 km) |
| McHenry to Obernburg am Main | 4,357.08 mi (7,012.04 km) |
| McHenry to Obernkirchen | 4,262.07 mi (6,859.14 km) |
| McHenry to Oberschleissheim | 4,510.37 mi (7,258.74 km) |
| McHenry to Oberstdorf | 4,496.90 mi (7,237.06 km) |
| McHenry to Obertraubling | 4,502.76 mi (7,246.49 km) |
| McHenry to Obertshausen | 4,336.91 mi (6,979.59 km) |
| McHenry to Oberursel | 4,322.21 mi (6,955.93 km) |
| McHenry to Ochsenfurt | 4,398.45 mi (7,078.62 km) |
| McHenry to Ochsenhausen | 4,457.51 mi (7,173.66 km) |
| McHenry to Ochtrup | 4,196.01 mi (6,752.82 km) |
| McHenry to Odenthal | 4,237.16 mi (6,819.05 km) |
| McHenry to Oelde | 4,244.24 mi (6,830.45 km) |
| McHenry to Oelsnitz | 4,443.11 mi (7,150.49 km) |
| McHenry to Oer-Erkenschwick | 4,219.17 mi (6,790.11 km) |
