| North Richland Hills to Nuth | 5,007.47 mi (8,058.75 km) |
| North Richland Hills to Oegstgeest | 4,910.81 mi (7,903.19 km) |
| North Richland Hills to Oirschot | 4,965.21 mi (7,990.74 km) |
| North Richland Hills to Oisterwijk | 4,958.60 mi (7,980.09 km) |
| North Richland Hills to Oldebroek | 4,953.99 mi (7,972.68 km) |
| North Richland Hills to Oldenzaal | 4,996.12 mi (8,040.48 km) |
| North Richland Hills to Ommen | 4,970.34 mi (7,998.99 km) |
| North Richland Hills to Oosterend | 4,940.59 mi (7,951.11 km) |
| North Richland Hills to Oosterhout | 4,943.79 mi (7,956.26 km) |
| North Richland Hills to Oosterwolde | 4,949.12 mi (7,964.84 km) |
| North Richland Hills to Oostzaan | 4,917.54 mi (7,914.02 km) |
| North Richland Hills to Opmeer | 4,910.82 mi (7,903.20 km) |
| North Richland Hills to Oss | 4,963.91 mi (7,988.63 km) |
| North Richland Hills to Oud-Beijerland | 4,920.86 mi (7,919.36 km) |
| North Richland Hills to Oudenbosch | 4,933.27 mi (7,939.32 km) |
