| Williamstown to Devnya | 4,947.82 mi (7,962.75 km) |
| Williamstown to Dimitrovgrad | 4,917.15 mi (7,913.39 km) |
| Williamstown to Dobrich | 4,943.63 mi (7,956.01 km) |
| Williamstown to Dospat | 4,874.44 mi (7,844.65 km) |
| Williamstown to Dupnitsa | 4,805.89 mi (7,734.34 km) |
| Williamstown to Elhovo | 4,951.76 mi (7,969.08 km) |
| Williamstown to Etropole | 4,819.37 mi (7,756.03 km) |
| Williamstown to Gabrovo | 4,872.49 mi (7,841.51 km) |
| Williamstown to Gorna Oryahovitsa | 4,876.37 mi (7,847.75 km) |
| Williamstown to Gotse Delchev | 4,859.77 mi (7,821.05 km) |
| Williamstown to Harmanli | 4,934.30 mi (7,940.99 km) |
| Williamstown to Haskovo | 4,920.63 mi (7,918.99 km) |
| Williamstown to Ihtiman | 4,827.85 mi (7,769.68 km) |
| Williamstown to Isperih | 4,897.63 mi (7,881.97 km) |
| Williamstown to Kardzhali | 4,924.16 mi (7,924.67 km) |
