| Round Rock to Montana | 6,108.27 mi (9,830.31 km) |
| Round Rock to Nova Zagora | 6,254.51 mi (10,065.65 km) |
| Round Rock to Novi Iskar | 6,141.33 mi (9,883.52 km) |
| Round Rock to Novi Pazar | 6,255.53 mi (10,067.30 km) |
| Round Rock to Omurtag | 6,239.70 mi (10,041.82 km) |
| Round Rock to Panagyurishte | 6,186.51 mi (9,956.23 km) |
| Round Rock to Parvomay | 6,243.90 mi (10,048.58 km) |
| Round Rock to Pavlikeni | 6,193.20 mi (9,966.99 km) |
| Round Rock to Pazardzhik | 6,206.25 mi (9,988.00 km) |
| Round Rock to Pernik | 6,138.74 mi (9,879.34 km) |
| Round Rock to Peshtera | 6,212.87 mi (9,998.65 km) |
| Round Rock to Petrich | 6,201.31 mi (9,980.05 km) |
| Round Rock to Pleven | 6,159.78 mi (9,913.21 km) |
| Round Rock to Plovdiv | 6,224.17 mi (10,016.84 km) |
| Round Rock to Pomorie | 6,308.69 mi (10,152.85 km) |
