| Gurnee to Opwijk | 4,116.92 mi (6,625.54 km) |
| Gurnee to Ostend | 4,060.62 mi (6,534.94 km) |
| Gurnee to Oud-Heverlee | 4,139.71 mi (6,662.22 km) |
| Gurnee to Oud-Turnhout | 4,134.01 mi (6,653.05 km) |
| Gurnee to Oudenaarde | 4,099.28 mi (6,597.16 km) |
| Gurnee to Oudenburg | 4,065.12 mi (6,542.17 km) |
| Gurnee to Oupeye | 4,180.52 mi (6,727.90 km) |
| Gurnee to Overijse | 4,136.54 mi (6,657.12 km) |
| Gurnee to Overpelt | 4,153.59 mi (6,684.56 km) |
| Gurnee to Paal | 4,151.04 mi (6,680.45 km) |
| Gurnee to Peer | 4,158.00 mi (6,691.66 km) |
| Gurnee to Pepinster | 4,192.17 mi (6,746.65 km) |
| Gurnee to Peruwelz | 4,110.49 mi (6,615.19 km) |
| Gurnee to Perwez | 4,152.80 mi (6,683.29 km) |
| Gurnee to Philippeville | 4,158.26 mi (6,692.08 km) |
