| Alpena to Opwijk | 3,825.01 mi (6,155.76 km) |
| Alpena to Ostend | 3,768.68 mi (6,065.10 km) |
| Alpena to Oud-Heverlee | 3,847.81 mi (6,192.45 km) |
| Alpena to Oud-Turnhout | 3,842.24 mi (6,183.48 km) |
| Alpena to Oudenaarde | 3,807.32 mi (6,127.29 km) |
| Alpena to Oudenburg | 3,773.17 mi (6,072.33 km) |
| Alpena to Oupeye | 3,888.67 mi (6,258.21 km) |
| Alpena to Overijse | 3,844.62 mi (6,187.32 km) |
| Alpena to Overpelt | 3,861.83 mi (6,215.02 km) |
| Alpena to Paal | 3,859.21 mi (6,210.81 km) |
| Alpena to Peer | 3,866.23 mi (6,222.09 km) |
| Alpena to Pepinster | 3,900.31 mi (6,276.94 km) |
| Alpena to Peruwelz | 3,818.48 mi (6,145.25 km) |
| Alpena to Perwez | 3,860.87 mi (6,213.48 km) |
| Alpena to Philippeville | 3,866.26 mi (6,222.15 km) |
