| Naperville to Oberkirch | 4,391.95 mi (7,068.16 km) |
| Naperville to Obernburg am Main | 4,380.87 mi (7,050.34 km) |
| Naperville to Obernkirchen | 4,287.18 mi (6,899.55 km) |
| Naperville to Oberschleissheim | 4,533.92 mi (7,296.64 km) |
| Naperville to Oberstdorf | 4,519.67 mi (7,273.71 km) |
| Naperville to Obertraubling | 4,526.83 mi (7,285.24 km) |
| Naperville to Obertshausen | 4,360.76 mi (7,017.96 km) |
| Naperville to Oberursel | 4,346.07 mi (6,994.33 km) |
| Naperville to Ochsenfurt | 4,422.37 mi (7,117.11 km) |
| Naperville to Ochsenhausen | 4,480.55 mi (7,210.74 km) |
| Naperville to Ochtrup | 4,220.67 mi (6,792.51 km) |
| Naperville to Odenthal | 4,261.15 mi (6,857.65 km) |
| Naperville to Oelde | 4,268.90 mi (6,870.14 km) |
| Naperville to Oelsnitz | 4,467.94 mi (7,190.45 km) |
| Naperville to Oer-Erkenschwick | 4,243.53 mi (6,829.30 km) |
