| Holbrook to Opwijk | 3,607.69 mi (5,806.02 km) |
| Holbrook to Ostend | 3,550.05 mi (5,713.26 km) |
| Holbrook to Oud-Heverlee | 3,630.66 mi (5,842.99 km) |
| Holbrook to Oud-Turnhout | 3,631.40 mi (5,844.18 km) |
| Holbrook to Oudenaarde | 3,586.79 mi (5,772.37 km) |
| Holbrook to Oudenburg | 3,554.33 mi (5,720.15 km) |
| Holbrook to Oupeye | 3,673.51 mi (5,911.94 km) |
| Holbrook to Overijse | 3,626.49 mi (5,836.27 km) |
| Holbrook to Overpelt | 3,651.37 mi (5,876.31 km) |
| Holbrook to Paal | 3,646.01 mi (5,867.68 km) |
| Holbrook to Peer | 3,654.98 mi (5,882.13 km) |
| Holbrook to Pepinster | 3,684.23 mi (5,929.20 km) |
| Holbrook to Peruwelz | 3,594.25 mi (5,784.39 km) |
| Holbrook to Perwez | 3,641.97 mi (5,861.19 km) |
| Holbrook to Philippeville | 3,641.90 mi (5,861.07 km) |
