| Castle Pines to Devnya | 5,998.35 mi (9,653.42 km) |
| Castle Pines to Dimitrovgrad | 6,006.12 mi (9,665.91 km) |
| Castle Pines to Dobrich | 5,986.10 mi (9,633.70 km) |
| Castle Pines to Dospat | 5,984.49 mi (9,631.10 km) |
| Castle Pines to Dupnitsa | 5,918.06 mi (9,524.20 km) |
| Castle Pines to Elhovo | 6,028.50 mi (9,701.94 km) |
| Castle Pines to Etropole | 5,914.06 mi (9,517.76 km) |
| Castle Pines to Gabrovo | 5,952.52 mi (9,579.66 km) |
| Castle Pines to Gorna Oryahovitsa | 5,948.57 mi (9,573.29 km) |
| Castle Pines to Gotse Delchev | 5,975.59 mi (9,616.78 km) |
| Castle Pines to Harmanli | 6,021.69 mi (9,690.97 km) |
| Castle Pines to Haskovo | 6,011.63 mi (9,674.79 km) |
| Castle Pines to Ihtiman | 5,930.24 mi (9,543.79 km) |
| Castle Pines to Isperih | 5,948.95 mi (9,573.92 km) |
| Castle Pines to Kardzhali | 6,021.38 mi (9,690.47 km) |
