| North Richland Hills to Oberkirch | 5,177.97 mi (8,333.14 km) |
| North Richland Hills to Obernburg am Main | 5,168.59 mi (8,318.03 km) |
| North Richland Hills to Obernkirchen | 5,076.24 mi (8,169.42 km) |
| North Richland Hills to Oberschleissheim | 5,321.24 mi (8,563.70 km) |
| North Richland Hills to Oberstdorf | 5,305.56 mi (8,538.47 km) |
| North Richland Hills to Obertraubling | 5,314.90 mi (8,553.51 km) |
| North Richland Hills to Obertshausen | 5,148.54 mi (8,285.78 km) |
| North Richland Hills to Oberursel | 5,133.88 mi (8,262.18 km) |
| North Richland Hills to Ochsenfurt | 5,210.24 mi (8,385.07 km) |
| North Richland Hills to Ochsenhausen | 5,266.98 mi (8,476.39 km) |
| North Richland Hills to Ochtrup | 5,009.39 mi (8,061.84 km) |
| North Richland Hills to Odenthal | 5,049.13 mi (8,125.79 km) |
| North Richland Hills to Oelde | 5,057.63 mi (8,139.47 km) |
| North Richland Hills to Oelsnitz | 5,256.79 mi (8,459.99 km) |
| North Richland Hills to Oer-Erkenschwick | 5,031.96 mi (8,098.16 km) |
