| Spencer to Opwijk | 4,340.96 mi (6,986.09 km) |
| Spencer to Ostend | 4,285.93 mi (6,897.54 km) |
| Spencer to Oud-Heverlee | 4,363.40 mi (7,022.22 km) |
| Spencer to Oud-Turnhout | 4,354.70 mi (7,008.21 km) |
| Spencer to Oudenaarde | 4,325.07 mi (6,960.53 km) |
| Spencer to Oudenburg | 4,290.47 mi (6,904.85 km) |
| Spencer to Oupeye | 4,402.80 mi (7,085.61 km) |
| Spencer to Overijse | 4,360.75 mi (7,017.95 km) |
| Spencer to Overpelt | 4,373.88 mi (7,039.07 km) |
| Spencer to Paal | 4,372.69 mi (7,037.16 km) |
| Spencer to Peer | 4,378.62 mi (7,046.70 km) |
| Spencer to Pepinster | 4,414.76 mi (7,104.87 km) |
| Spencer to Peruwelz | 4,337.93 mi (6,981.23 km) |
| Spencer to Perwez | 4,377.20 mi (7,044.42 km) |
| Spencer to Philippeville | 4,385.25 mi (7,057.38 km) |
