| Ironton to Oberkirch | 4,326.47 mi (6,962.78 km) |
| Ironton to Obernburg am Main | 4,325.80 mi (6,961.70 km) |
| Ironton to Obernkirchen | 4,246.92 mi (6,834.76 km) |
| Ironton to Oberschleissheim | 4,475.37 mi (7,202.42 km) |
| Ironton to Oberstdorf | 4,452.98 mi (7,166.38 km) |
| Ironton to Obertraubling | 4,473.95 mi (7,200.12 km) |
| Ironton to Obertshausen | 4,306.33 mi (6,930.37 km) |
| Ironton to Oberursel | 4,291.88 mi (6,907.11 km) |
| Ironton to Ochsenfurt | 4,368.35 mi (7,030.18 km) |
| Ironton to Ochsenhausen | 4,416.90 mi (7,108.31 km) |
| Ironton to Ochtrup | 4,175.83 mi (6,720.35 km) |
| Ironton to Odenthal | 4,208.76 mi (6,773.35 km) |
| Ironton to Oelde | 4,223.81 mi (6,797.57 km) |
| Ironton to Oelsnitz | 4,423.54 mi (7,119.00 km) |
| Ironton to Oer-Erkenschwick | 4,195.27 mi (6,751.63 km) |
