| Richardson to Devnya | 6,106.20 mi (9,826.98 km) |
| Richardson to Dimitrovgrad | 6,093.51 mi (9,806.56 km) |
| Richardson to Dobrich | 6,098.02 mi (9,813.82 km) |
| Richardson to Dospat | 6,060.08 mi (9,752.76 km) |
| Richardson to Dupnitsa | 5,991.77 mi (9,642.83 km) |
| Richardson to Elhovo | 6,122.76 mi (9,853.63 km) |
| Richardson to Etropole | 5,997.32 mi (9,651.76 km) |
| Richardson to Gabrovo | 6,044.15 mi (9,727.12 km) |
| Richardson to Gorna Oryahovitsa | 6,044.35 mi (9,727.44 km) |
| Richardson to Gotse Delchev | 6,047.89 mi (9,733.14 km) |
| Richardson to Harmanli | 6,110.11 mi (9,833.28 km) |
| Richardson to Haskovo | 6,097.98 mi (9,813.75 km) |
| Richardson to Ihtiman | 6,009.47 mi (9,671.31 km) |
| Richardson to Isperih | 6,055.80 mi (9,745.86 km) |
| Richardson to Kardzhali | 6,104.44 mi (9,824.14 km) |
