| Houma to Nuth | 4,927.82 mi (7,930.56 km) |
| Houma to Oegstgeest | 4,837.08 mi (7,784.53 km) |
| Houma to Oirschot | 4,888.39 mi (7,867.11 km) |
| Houma to Oisterwijk | 4,882.15 mi (7,857.07 km) |
| Houma to Oldebroek | 4,885.40 mi (7,862.30 km) |
| Houma to Oldenzaal | 4,928.94 mi (7,932.35 km) |
| Houma to Ommen | 4,903.41 mi (7,891.27 km) |
| Houma to Oosterend | 4,876.39 mi (7,847.79 km) |
| Houma to Oosterhout | 4,867.00 mi (7,832.68 km) |
| Houma to Oosterwolde | 4,885.32 mi (7,862.16 km) |
| Houma to Oostzaan | 4,846.56 mi (7,799.79 km) |
| Houma to Opmeer | 4,841.93 mi (7,792.34 km) |
| Houma to Oss | 4,889.51 mi (7,868.90 km) |
| Houma to Oud-Beijerland | 4,844.31 mi (7,796.17 km) |
| Houma to Oudenbosch | 4,855.33 mi (7,813.91 km) |
