| Union to Devnya | 5,611.04 mi (9,030.09 km) |
| Union to Dimitrovgrad | 5,598.15 mi (9,009.34 km) |
| Union to Dobrich | 5,602.97 mi (9,017.10 km) |
| Union to Dospat | 5,564.83 mi (8,955.73 km) |
| Union to Dupnitsa | 5,496.54 mi (8,845.82 km) |
| Union to Elhovo | 5,627.40 mi (9,056.42 km) |
| Union to Etropole | 5,501.97 mi (8,854.56 km) |
| Union to Gabrovo | 5,548.78 mi (8,929.90 km) |
| Union to Gorna Oryahovitsa | 5,549.01 mi (8,930.26 km) |
| Union to Gotse Delchev | 5,552.70 mi (8,936.21 km) |
| Union to Harmanli | 5,614.75 mi (9,036.06 km) |
| Union to Haskovo | 5,602.62 mi (9,016.54 km) |
| Union to Ihtiman | 5,514.16 mi (8,874.18 km) |
| Union to Isperih | 5,560.63 mi (8,948.96 km) |
| Union to Kardzhali | 5,609.10 mi (9,026.97 km) |
