| DeForest to Oerlinghausen | 4,250.25 mi (6,840.11 km) |
| DeForest to Oestrich-Winkel | 4,304.58 mi (6,927.55 km) |
| DeForest to Offenburg | 4,363.80 mi (7,022.86 km) |
| DeForest to Oftersheim | 4,351.14 mi (7,002.49 km) |
| DeForest to Ohrdruf | 4,368.47 mi (7,030.38 km) |
| DeForest to Ohringen | 4,391.40 mi (7,067.27 km) |
| DeForest to Olbernhau | 4,465.63 mi (7,186.74 km) |
| DeForest to Olching | 4,499.15 mi (7,240.68 km) |
| DeForest to Oldenburg | 4,188.58 mi (6,740.86 km) |
| DeForest to Oldenburg in Holstein | 4,233.11 mi (6,812.53 km) |
| DeForest to Olfen | 4,214.88 mi (6,783.20 km) |
| DeForest to Olpe | 4,258.26 mi (6,853.00 km) |
| DeForest to Olsberg | 4,268.19 mi (6,868.98 km) |
| DeForest to Oranienburg | 4,374.17 mi (7,039.55 km) |
| DeForest to Ortenberg | 4,328.30 mi (6,965.72 km) |
