| Porterville to Devnya | 6,570.01 mi (10,573.42 km) |
| Porterville to Dimitrovgrad | 6,595.82 mi (10,614.95 km) |
| Porterville to Dobrich | 6,554.32 mi (10,548.15 km) |
| Porterville to Dospat | 6,584.82 mi (10,597.24 km) |
| Porterville to Dupnitsa | 6,521.33 mi (10,495.07 km) |
| Porterville to Elhovo | 6,611.70 mi (10,640.50 km) |
| Porterville to Etropole | 6,509.25 mi (10,475.63 km) |
| Porterville to Gabrovo | 6,539.64 mi (10,524.54 km) |
| Porterville to Gorna Oryahovitsa | 6,532.10 mi (10,512.41 km) |
| Porterville to Gotse Delchev | 6,578.90 mi (10,587.71 km) |
| Porterville to Harmanli | 6,610.16 mi (10,638.03 km) |
| Porterville to Haskovo | 6,602.13 mi (10,625.11 km) |
| Porterville to Ihtiman | 6,528.56 mi (10,506.70 km) |
| Porterville to Isperih | 6,522.60 mi (10,497.11 km) |
| Porterville to Kardzhali | 6,614.53 mi (10,645.06 km) |
