| Round Rock to Ondokuzmayis | 6,653.03 mi (10,707.02 km) |
| Round Rock to Ordu | 6,738.68 mi (10,844.86 km) |
| Round Rock to Ortahisar | 6,765.98 mi (10,888.79 km) |
| Round Rock to Ortakent | 6,564.04 mi (10,563.81 km) |
| Round Rock to Ortaklar | 6,534.02 mi (10,515.48 km) |
| Round Rock to Ortakoy | 6,731.10 mi (10,832.67 km) |
| Round Rock to Ortakoy | 6,691.24 mi (10,768.51 km) |
| Round Rock to Osmaneli | 6,505.28 mi (10,469.23 km) |
| Round Rock to Osmaniye | 6,896.47 mi (11,098.80 km) |
| Round Rock to Ozdere | 6,513.13 mi (10,481.87 km) |
| Round Rock to Palu | 6,930.49 mi (11,153.54 km) |
| Round Rock to Pamukkale | 6,594.05 mi (10,612.09 km) |
| Round Rock to Patnos | 6,990.41 mi (11,249.98 km) |
| Round Rock to Pazar | 6,727.12 mi (10,826.25 km) |
| Round Rock to Pazarcik | 6,910.23 mi (11,120.94 km) |
