| Glen Carbon to Opwijk | 4,367.85 mi (7,029.38 km) |
| Glen Carbon to Ostend | 4,311.20 mi (6,938.20 km) |
| Glen Carbon to Oud-Heverlee | 4,390.72 mi (7,066.18 km) |
| Glen Carbon to Oud-Turnhout | 4,386.08 mi (7,058.71 km) |
| Glen Carbon to Oudenaarde | 4,349.62 mi (7,000.03 km) |
| Glen Carbon to Oudenburg | 4,315.66 mi (6,945.39 km) |
| Glen Carbon to Oupeye | 4,431.96 mi (7,132.56 km) |
| Glen Carbon to Overijse | 4,387.37 mi (7,060.80 km) |
| Glen Carbon to Overpelt | 4,405.76 mi (7,090.39 km) |
| Glen Carbon to Paal | 4,402.74 mi (7,085.53 km) |
| Glen Carbon to Peer | 4,410.05 mi (7,097.29 km) |
| Glen Carbon to Pepinster | 4,443.48 mi (7,151.10 km) |
| Glen Carbon to Peruwelz | 4,360.20 mi (7,017.06 km) |
| Glen Carbon to Perwez | 4,403.54 mi (7,086.81 km) |
| Glen Carbon to Philippeville | 4,408.06 mi (7,094.08 km) |
