| Howard to Nuth | 4,083.13 mi (6,571.16 km) |
| Howard to Oegstgeest | 3,984.18 mi (6,411.92 km) |
| Howard to Oirschot | 4,039.74 mi (6,501.33 km) |
| Howard to Oisterwijk | 4,032.98 mi (6,490.46 km) |
| Howard to Oldebroek | 4,024.95 mi (6,477.52 km) |
| Howard to Oldenzaal | 4,066.32 mi (6,544.12 km) |
| Howard to Ommen | 4,040.55 mi (6,502.63 km) |
| Howard to Oosterend | 4,009.82 mi (6,453.18 km) |
| Howard to Oosterhout | 4,018.41 mi (6,467.00 km) |
| Howard to Oosterwolde | 4,018.15 mi (6,466.59 km) |
| Howard to Oostzaan | 3,989.67 mi (6,420.75 km) |
| Howard to Opmeer | 3,982.08 mi (6,408.54 km) |
| Howard to Oss | 4,037.34 mi (6,497.46 km) |
| Howard to Oud-Beijerland | 3,995.47 mi (6,430.09 km) |
| Howard to Oudenbosch | 4,008.46 mi (6,450.99 km) |
