| Campbell to Opwijk | 5,522.04 mi (8,886.86 km) |
| Campbell to Ostend | 5,472.45 mi (8,807.05 km) |
| Campbell to Oud-Heverlee | 5,542.74 mi (8,920.18 km) |
| Campbell to Oud-Turnhout | 5,526.16 mi (8,893.50 km) |
| Campbell to Oudenaarde | 5,511.48 mi (8,869.87 km) |
| Campbell to Oudenburg | 5,476.96 mi (8,814.32 km) |
| Campbell to Oupeye | 5,576.80 mi (8,975.00 km) |
| Campbell to Overijse | 5,541.59 mi (8,918.33 km) |
| Campbell to Overpelt | 5,543.51 mi (8,921.42 km) |
| Campbell to Paal | 5,546.11 mi (8,925.60 km) |
| Campbell to Peer | 5,548.98 mi (8,930.23 km) |
| Campbell to Pepinster | 5,589.19 mi (8,994.93 km) |
| Campbell to Peruwelz | 5,528.35 mi (8,897.01 km) |
| Campbell to Perwez | 5,557.96 mi (8,944.67 km) |
| Campbell to Philippeville | 5,572.74 mi (8,968.46 km) |
