| Des Plaines to Oerlinghausen | 4,258.71 mi (6,853.73 km) |
| Des Plaines to Oestrich-Winkel | 4,308.97 mi (6,934.62 km) |
| Des Plaines to Offenburg | 4,365.41 mi (7,025.46 km) |
| Des Plaines to Oftersheim | 4,354.88 mi (7,008.51 km) |
| Des Plaines to Ohrdruf | 4,376.50 mi (7,043.29 km) |
| Des Plaines to Ohringen | 4,395.58 mi (7,074.00 km) |
| Des Plaines to Olbernhau | 4,475.47 mi (7,202.58 km) |
| Des Plaines to Olching | 4,503.13 mi (7,247.09 km) |
| Des Plaines to Oldenburg | 4,198.85 mi (6,757.40 km) |
| Des Plaines to Oldenburg in Holstein | 4,247.41 mi (6,835.54 km) |
| Des Plaines to Olfen | 4,221.92 mi (6,794.53 km) |
| Des Plaines to Olpe | 4,264.36 mi (6,862.82 km) |
| Des Plaines to Olsberg | 4,275.39 mi (6,880.57 km) |
| Des Plaines to Oranienburg | 4,387.50 mi (7,060.99 km) |
| Des Plaines to Ortenberg | 4,334.16 mi (6,975.16 km) |
