| Castaic to Devnya | 6,660.77 mi (10,719.48 km) |
| Castaic to Dimitrovgrad | 6,684.45 mi (10,757.59 km) |
| Castaic to Dobrich | 6,645.45 mi (10,694.82 km) |
| Castaic to Dospat | 6,672.09 mi (10,737.69 km) |
| Castaic to Dupnitsa | 6,608.15 mi (10,634.79 km) |
| Castaic to Elhovo | 6,701.14 mi (10,784.44 km) |
| Castaic to Etropole | 6,597.10 mi (10,617.01 km) |
| Castaic to Gabrovo | 6,628.53 mi (10,667.60 km) |
| Castaic to Gorna Oryahovitsa | 6,621.42 mi (10,656.15 km) |
| Castaic to Gotse Delchev | 6,665.77 mi (10,727.52 km) |
| Castaic to Harmanli | 6,698.96 mi (10,780.93 km) |
| Castaic to Haskovo | 6,690.67 mi (10,767.59 km) |
| Castaic to Ihtiman | 6,616.03 mi (10,647.47 km) |
| Castaic to Isperih | 6,613.08 mi (10,642.72 km) |
| Castaic to Kardzhali | 6,702.75 mi (10,787.04 km) |
