| Duluth to Opwijk | 4,060.39 mi (6,534.56 km) |
| Duluth to Ostend | 4,005.76 mi (6,446.65 km) |
| Duluth to Oud-Heverlee | 4,082.72 mi (6,570.50 km) |
| Duluth to Oud-Turnhout | 4,073.26 mi (6,555.28 km) |
| Duluth to Oudenaarde | 4,044.99 mi (6,509.78 km) |
| Duluth to Oudenburg | 4,010.31 mi (6,453.97 km) |
| Duluth to Oupeye | 4,121.70 mi (6,633.24 km) |
| Duluth to Overijse | 4,080.20 mi (6,566.46 km) |
| Duluth to Overpelt | 4,092.32 mi (6,585.95 km) |
| Duluth to Paal | 4,091.47 mi (6,584.59 km) |
| Duluth to Peer | 4,097.14 mi (6,593.70 km) |
| Duluth to Pepinster | 4,133.73 mi (6,652.60 km) |
| Duluth to Peruwelz | 4,058.28 mi (6,531.17 km) |
| Duluth to Perwez | 4,096.68 mi (6,592.98 km) |
| Duluth to Philippeville | 4,105.41 mi (6,607.02 km) |
