| McDonough to Oerlinghausen | 4,551.33 mi (7,324.65 km) |
| McDonough to Oestrich-Winkel | 4,580.62 mi (7,371.80 km) |
| McDonough to Offenburg | 4,622.12 mi (7,438.59 km) |
| McDonough to Oftersheim | 4,622.55 mi (7,439.27 km) |
| McDonough to Ohrdruf | 4,665.26 mi (7,508.01 km) |
| McDonough to Ohringen | 4,664.87 mi (7,507.39 km) |
| McDonough to Olbernhau | 4,771.79 mi (7,679.46 km) |
| McDonough to Olching | 4,769.81 mi (7,676.26 km) |
| McDonough to Oldenburg | 4,501.28 mi (7,244.11 km) |
| McDonough to Oldenburg in Holstein | 4,568.63 mi (7,352.51 km) |
| McDonough to Olfen | 4,508.08 mi (7,255.05 km) |
| McDonough to Olpe | 4,545.22 mi (7,314.82 km) |
| McDonough to Olsberg | 4,561.55 mi (7,341.11 km) |
| McDonough to Oranienburg | 4,702.08 mi (7,567.26 km) |
| McDonough to Ortenberg | 4,612.80 mi (7,423.58 km) |
