| Merrillville to Oberkirch | 4,372.61 mi (7,037.03 km) |
| Merrillville to Obernburg am Main | 4,362.79 mi (7,021.24 km) |
| Merrillville to Obernkirchen | 4,270.87 mi (6,873.29 km) |
| Merrillville to Oberschleissheim | 4,515.50 mi (7,266.99 km) |
| Merrillville to Oberstdorf | 4,500.25 mi (7,242.45 km) |
| Merrillville to Obertraubling | 4,509.10 mi (7,256.70 km) |
| Merrillville to Obertshausen | 4,342.75 mi (6,988.97 km) |
| Merrillville to Oberursel | 4,328.08 mi (6,965.37 km) |
| Merrillville to Ochsenfurt | 4,404.44 mi (7,088.26 km) |
| Merrillville to Ochsenhausen | 4,461.48 mi (7,180.05 km) |
| Merrillville to Ochtrup | 4,203.75 mi (6,765.28 km) |
| Merrillville to Odenthal | 4,243.32 mi (6,828.97 km) |
| Merrillville to Oelde | 4,251.98 mi (6,842.90 km) |
| Merrillville to Oelsnitz | 4,451.22 mi (7,163.54 km) |
| Merrillville to Oer-Erkenschwick | 4,226.20 mi (6,801.42 km) |
