| Conneaut to Oerlinghausen | 3,995.73 mi (6,430.50 km) |
| Conneaut to Oestrich-Winkel | 4,035.87 mi (6,495.10 km) |
| Conneaut to Offenburg | 4,085.52 mi (6,575.01 km) |
| Conneaut to Oftersheim | 4,080.03 mi (6,566.18 km) |
| Conneaut to Ohrdruf | 4,111.94 mi (6,617.53 km) |
| Conneaut to Ohringen | 4,121.63 mi (6,633.12 km) |
| Conneaut to Olbernhau | 4,215.02 mi (6,783.41 km) |
| Conneaut to Olching | 4,228.27 mi (6,804.75 km) |
| Conneaut to Oldenburg | 3,940.72 mi (6,341.97 km) |
| Conneaut to Oldenburg in Holstein | 3,999.44 mi (6,436.47 km) |
| Conneaut to Olfen | 3,955.59 mi (6,365.91 km) |
| Conneaut to Olpe | 3,995.55 mi (6,430.22 km) |
| Conneaut to Olsberg | 4,009.23 mi (6,452.23 km) |
| Conneaut to Oranienburg | 4,136.33 mi (6,656.78 km) |
| Conneaut to Ortenberg | 4,064.49 mi (6,541.17 km) |
