| Butler to Opwijk | 3,878.14 mi (6,241.26 km) |
| Butler to Ostend | 3,820.82 mi (6,149.02 km) |
| Butler to Oud-Heverlee | 3,901.12 mi (6,278.25 km) |
| Butler to Oud-Turnhout | 3,899.24 mi (6,275.22 km) |
| Butler to Oudenaarde | 3,858.48 mi (6,209.63 km) |
| Butler to Oudenburg | 3,825.21 mi (6,156.07 km) |
| Butler to Oupeye | 3,943.31 mi (6,346.14 km) |
| Butler to Overijse | 3,897.34 mi (6,272.17 km) |
| Butler to Overpelt | 3,919.12 mi (6,307.22 km) |
| Butler to Paal | 3,914.89 mi (6,300.40 km) |
| Butler to Peer | 3,923.08 mi (6,313.58 km) |
| Butler to Pepinster | 3,954.45 mi (6,364.07 km) |
| Butler to Peruwelz | 3,867.50 mi (6,224.14 km) |
| Butler to Perwez | 3,913.20 mi (6,297.69 km) |
| Butler to Philippeville | 3,915.38 mi (6,301.19 km) |
