| Boulder to Montana | 5,838.48 mi (9,396.13 km) |
| Boulder to Nova Zagora | 5,972.88 mi (9,612.42 km) |
| Boulder to Novi Iskar | 5,875.91 mi (9,456.36 km) |
| Boulder to Novi Pazar | 5,958.46 mi (9,589.22 km) |
| Boulder to Omurtag | 5,950.20 mi (9,575.92 km) |
| Boulder to Panagyurishte | 5,917.81 mi (9,523.80 km) |
| Boulder to Parvomay | 5,971.23 mi (9,609.77 km) |
| Boulder to Pavlikeni | 5,910.23 mi (9,511.59 km) |
| Boulder to Pazardzhik | 5,939.05 mi (9,557.98 km) |
| Boulder to Pernik | 5,877.26 mi (9,458.54 km) |
| Boulder to Peshtera | 5,947.33 mi (9,571.30 km) |
| Boulder to Petrich | 5,949.08 mi (9,574.12 km) |
| Boulder to Pleven | 5,880.31 mi (9,463.45 km) |
| Boulder to Plovdiv | 5,954.42 mi (9,582.72 km) |
| Boulder to Pomorie | 6,014.95 mi (9,680.12 km) |
