| Delaware to Oberkirch | 4,262.04 mi (6,859.09 km) |
| Delaware to Obernburg am Main | 4,258.34 mi (6,853.14 km) |
| Delaware to Obernkirchen | 4,175.20 mi (6,719.33 km) |
| Delaware to Oberschleissheim | 4,409.08 mi (7,095.73 km) |
| Delaware to Oberstdorf | 4,389.05 mi (7,063.49 km) |
| Delaware to Obertraubling | 4,406.02 mi (7,090.81 km) |
| Delaware to Obertshausen | 4,238.67 mi (6,821.48 km) |
| Delaware to Oberursel | 4,224.14 mi (6,798.09 km) |
| Delaware to Ochsenfurt | 4,300.64 mi (6,921.21 km) |
| Delaware to Ochsenhausen | 4,352.03 mi (7,003.91 km) |
| Delaware to Ochtrup | 4,105.30 mi (6,606.85 km) |
| Delaware to Odenthal | 4,140.41 mi (6,663.34 km) |
| Delaware to Oelde | 4,153.41 mi (6,684.27 km) |
| Delaware to Oelsnitz | 4,353.16 mi (7,005.73 km) |
| Delaware to Oer-Erkenschwick | 4,125.73 mi (6,639.72 km) |
