| Carol Stream to Oberkirch | 4,382.65 mi (7,053.20 km) |
| Carol Stream to Obernburg am Main | 4,371.37 mi (7,035.04 km) |
| Carol Stream to Obernkirchen | 4,277.40 mi (6,883.82 km) |
| Carol Stream to Oberschleissheim | 4,524.47 mi (7,281.43 km) |
| Carol Stream to Oberstdorf | 4,510.39 mi (7,258.76 km) |
| Carol Stream to Obertraubling | 4,517.27 mi (7,269.85 km) |
| Carol Stream to Obertshausen | 4,351.25 mi (7,002.65 km) |
| Carol Stream to Oberursel | 4,336.56 mi (6,979.01 km) |
| Carol Stream to Ochsenfurt | 4,412.84 mi (7,101.78 km) |
| Carol Stream to Ochsenhausen | 4,471.21 mi (7,195.71 km) |
| Carol Stream to Ochtrup | 4,210.98 mi (6,776.92 km) |
| Carol Stream to Odenthal | 4,251.60 mi (6,842.29 km) |
| Carol Stream to Oelde | 4,259.22 mi (6,854.55 km) |
| Carol Stream to Oelsnitz | 4,458.22 mi (7,174.81 km) |
| Carol Stream to Oer-Erkenschwick | 4,233.91 mi (6,813.82 km) |
