| Huntsville to Oerlinghausen | 4,582.76 mi (7,375.25 km) |
| Huntsville to Oestrich-Winkel | 4,618.15 mi (7,432.20 km) |
| Huntsville to Offenburg | 4,663.95 mi (7,505.90 km) |
| Huntsville to Oftersheim | 4,661.31 mi (7,501.65 km) |
| Huntsville to Ohrdruf | 4,698.10 mi (7,560.87 km) |
| Huntsville to Ohringen | 4,703.28 mi (7,569.20 km) |
| Huntsville to Olbernhau | 4,802.70 mi (7,729.19 km) |
| Huntsville to Olching | 4,809.21 mi (7,739.68 km) |
| Huntsville to Oldenburg | 4,529.73 mi (7,289.89 km) |
| Huntsville to Oldenburg in Holstein | 4,591.66 mi (7,389.56 km) |
| Huntsville to Olfen | 4,541.28 mi (7,308.48 km) |
| Huntsville to Olpe | 4,580.03 mi (7,370.85 km) |
| Huntsville to Olsberg | 4,594.89 mi (7,394.75 km) |
| Huntsville to Oranienburg | 4,727.42 mi (7,608.04 km) |
| Huntsville to Ortenberg | 4,648.42 mi (7,480.91 km) |
