| Gardner to Opwijk | 4,549.65 mi (7,321.96 km) |
| Gardner to Ostend | 4,493.68 mi (7,231.87 km) |
| Gardner to Oud-Heverlee | 4,572.36 mi (7,358.50 km) |
| Gardner to Oud-Turnhout | 4,565.77 mi (7,347.89 km) |
| Gardner to Oudenaarde | 4,532.50 mi (7,294.36 km) |
| Gardner to Oudenburg | 4,498.19 mi (7,239.13 km) |
| Gardner to Oupeye | 4,612.79 mi (7,423.56 km) |
| Gardner to Overijse | 4,569.34 mi (7,353.64 km) |
| Gardner to Overpelt | 4,585.24 mi (7,379.23 km) |
| Gardner to Paal | 4,583.09 mi (7,375.78 km) |
| Gardner to Peer | 4,589.75 mi (7,386.49 km) |
| Gardner to Pepinster | 4,624.54 mi (7,442.48 km) |
| Gardner to Peruwelz | 4,544.18 mi (7,313.15 km) |
| Gardner to Perwez | 4,585.66 mi (7,379.91 km) |
| Gardner to Philippeville | 4,591.86 mi (7,389.88 km) |
