| Castro Valley to Devnya | 6,529.88 mi (10,508.82 km) |
| Castro Valley to Dimitrovgrad | 6,561.99 mi (10,560.51 km) |
| Castro Valley to Dobrich | 6,513.06 mi (10,481.75 km) |
| Castro Valley to Dospat | 6,554.95 mi (10,549.18 km) |
| Castro Valley to Dupnitsa | 6,492.87 mi (10,449.26 km) |
| Castro Valley to Elhovo | 6,575.44 mi (10,582.15 km) |
| Castro Valley to Etropole | 6,477.85 mi (10,425.09 km) |
| Castro Valley to Gabrovo | 6,505.15 mi (10,469.03 km) |
| Castro Valley to Gorna Oryahovitsa | 6,496.36 mi (10,454.88 km) |
| Castro Valley to Gotse Delchev | 6,550.17 mi (10,541.49 km) |
| Castro Valley to Harmanli | 6,575.82 mi (10,582.75 km) |
| Castro Valley to Haskovo | 6,568.56 mi (10,571.08 km) |
| Castro Valley to Ihtiman | 6,498.22 mi (10,457.87 km) |
| Castro Valley to Isperih | 6,483.39 mi (10,434.00 km) |
| Castro Valley to Kardzhali | 6,581.87 mi (10,592.50 km) |
