| Campton Hills to Oerlinghausen | 4,281.30 mi (6,890.09 km) |
| Campton Hills to Oestrich-Winkel | 4,332.11 mi (6,971.86 km) |
| Campton Hills to Offenburg | 4,388.90 mi (7,063.26 km) |
| Campton Hills to Oftersheim | 4,378.11 mi (7,045.88 km) |
| Campton Hills to Ohrdruf | 4,399.16 mi (7,079.77 km) |
| Campton Hills to Ohringen | 4,418.75 mi (7,111.29 km) |
| Campton Hills to Olbernhau | 4,497.89 mi (7,238.66 km) |
| Campton Hills to Olching | 4,526.33 mi (7,284.43 km) |
| Campton Hills to Oldenburg | 4,221.20 mi (6,793.36 km) |
| Campton Hills to Oldenburg in Holstein | 4,269.18 mi (6,870.58 km) |
| Campton Hills to Olfen | 4,244.71 mi (6,831.20 km) |
| Campton Hills to Olpe | 4,287.27 mi (6,899.70 km) |
| Campton Hills to Olsberg | 4,298.16 mi (6,917.22 km) |
| Campton Hills to Oranienburg | 4,409.42 mi (7,096.27 km) |
| Campton Hills to Ortenberg | 4,357.11 mi (7,012.09 km) |
