| Helena to Nuth | 4,755.32 mi (7,652.94 km) |
| Helena to Oegstgeest | 4,649.39 mi (7,482.47 km) |
| Helena to Oirschot | 4,708.32 mi (7,577.31 km) |
| Helena to Oisterwijk | 4,701.16 mi (7,565.78 km) |
| Helena to Oldebroek | 4,675.62 mi (7,524.68 km) |
| Helena to Oldenzaal | 4,711.01 mi (7,581.64 km) |
| Helena to Ommen | 4,686.36 mi (7,541.97 km) |
| Helena to Oosterend | 4,651.34 mi (7,485.61 km) |
| Helena to Oosterhout | 4,688.34 mi (7,545.15 km) |
| Helena to Oosterwolde | 4,658.18 mi (7,496.61 km) |
| Helena to Oostzaan | 4,648.21 mi (7,480.57 km) |
| Helena to Opmeer | 4,636.30 mi (7,461.40 km) |
| Helena to Oss | 4,700.54 mi (7,564.79 km) |
| Helena to Oud-Beijerland | 4,666.39 mi (7,509.82 km) |
| Helena to Oudenbosch | 4,681.65 mi (7,534.39 km) |
