| Castle Rock to Devnya | 6,002.88 mi (9,660.70 km) |
| Castle Rock to Dimitrovgrad | 6,010.51 mi (9,672.99 km) |
| Castle Rock to Dobrich | 5,990.65 mi (9,641.02 km) |
| Castle Rock to Dospat | 5,988.80 mi (9,638.05 km) |
| Castle Rock to Dupnitsa | 5,922.36 mi (9,531.11 km) |
| Castle Rock to Elhovo | 6,032.94 mi (9,709.08 km) |
| Castle Rock to Etropole | 5,918.42 mi (9,524.78 km) |
| Castle Rock to Gabrovo | 5,956.94 mi (9,586.77 km) |
| Castle Rock to Gorna Oryahovitsa | 5,953.01 mi (9,580.44 km) |
| Castle Rock to Gotse Delchev | 5,979.88 mi (9,623.69 km) |
| Castle Rock to Harmanli | 6,026.09 mi (9,698.05 km) |
| Castle Rock to Haskovo | 6,016.02 mi (9,681.85 km) |
| Castle Rock to Ihtiman | 5,934.57 mi (9,550.77 km) |
| Castle Rock to Isperih | 5,953.47 mi (9,581.18 km) |
| Castle Rock to Kardzhali | 6,025.74 mi (9,697.50 km) |
