| Gresham to Opwijk | 5,050.58 mi (8,128.13 km) |
| Gresham to Ostend | 5,003.62 mi (8,052.54 km) |
| Gresham to Oud-Heverlee | 5,070.39 mi (8,160.01 km) |
| Gresham to Oud-Turnhout | 5,051.25 mi (8,129.20 km) |
| Gresham to Oudenaarde | 5,042.09 mi (8,114.46 km) |
| Gresham to Oudenburg | 5,008.06 mi (8,059.69 km) |
| Gresham to Oupeye | 5,102.13 mi (8,211.08 km) |
| Gresham to Overijse | 5,069.80 mi (8,159.05 km) |
| Gresham to Overpelt | 5,067.74 mi (8,155.74 km) |
| Gresham to Paal | 5,071.63 mi (8,161.99 km) |
| Gresham to Peer | 5,073.40 mi (8,164.84 km) |
| Gresham to Pepinster | 5,114.51 mi (8,231.00 km) |
| Gresham to Peruwelz | 5,060.21 mi (8,143.63 km) |
| Gresham to Perwez | 5,085.92 mi (8,185.00 km) |
| Gresham to Philippeville | 5,102.95 mi (8,212.41 km) |
