| Euclid to Opwijk | 3,908.57 mi (6,290.24 km) |
| Euclid to Ostend | 3,851.46 mi (6,198.33 km) |
| Euclid to Oud-Heverlee | 3,931.53 mi (6,327.19 km) |
| Euclid to Oud-Turnhout | 3,928.63 mi (6,322.51 km) |
| Euclid to Oudenaarde | 3,889.44 mi (6,259.44 km) |
| Euclid to Oudenburg | 3,855.88 mi (6,205.45 km) |
| Euclid to Oupeye | 3,973.39 mi (6,394.56 km) |
| Euclid to Overijse | 3,927.91 mi (6,321.36 km) |
| Euclid to Overpelt | 3,948.45 mi (6,354.42 km) |
| Euclid to Paal | 3,944.66 mi (6,348.32 km) |
| Euclid to Peer | 3,952.53 mi (6,360.98 km) |
| Euclid to Pepinster | 3,984.68 mi (6,412.73 km) |
| Euclid to Peruwelz | 3,899.05 mi (6,274.92 km) |
| Euclid to Perwez | 3,943.89 mi (6,347.08 km) |
| Euclid to Philippeville | 3,946.95 mi (6,352.01 km) |
