| Colton to Popovo | 6,616.03 mi (10,647.47 km) |
| Colton to Provadia | 6,655.54 mi (10,711.05 km) |
| Colton to Radnevo | 6,671.44 mi (10,736.65 km) |
| Colton to Radomir | 6,578.22 mi (10,586.63 km) |
| Colton to Rakitovo | 6,641.99 mi (10,689.26 km) |
| Colton to Rakovski | 6,647.19 mi (10,697.62 km) |
| Colton to Razgrad | 6,612.02 mi (10,641.02 km) |
| Colton to Razlog | 6,631.30 mi (10,672.05 km) |
| Colton to Ruse | 6,580.71 mi (10,590.63 km) |
| Colton to Samokov | 6,607.02 mi (10,632.98 km) |
| Colton to Sandanski | 6,644.78 mi (10,693.74 km) |
| Colton to Sevlievo | 6,607.15 mi (10,633.19 km) |
| Colton to Shumen | 6,637.31 mi (10,681.72 km) |
| Colton to Silistra | 6,594.83 mi (10,613.35 km) |
| Colton to Sliven | 6,658.57 mi (10,715.93 km) |
