| Port Huron to Devnya | 5,076.54 mi (8,169.91 km) |
| Port Huron to Dimitrovgrad | 5,060.17 mi (8,143.56 km) |
| Port Huron to Dobrich | 5,069.27 mi (8,158.20 km) |
| Port Huron to Dospat | 5,025.17 mi (8,087.24 km) |
| Port Huron to Dupnitsa | 4,956.75 mi (7,977.12 km) |
| Port Huron to Elhovo | 5,090.46 mi (8,192.31 km) |
| Port Huron to Etropole | 4,963.57 mi (7,988.10 km) |
| Port Huron to Gabrovo | 5,011.61 mi (8,065.40 km) |
| Port Huron to Gorna Oryahovitsa | 5,012.53 mi (8,066.88 km) |
| Port Huron to Gotse Delchev | 5,012.61 mi (8,067.02 km) |
| Port Huron to Harmanli | 5,076.90 mi (8,170.48 km) |
| Port Huron to Haskovo | 5,064.47 mi (8,150.48 km) |
| Port Huron to Ihtiman | 4,975.13 mi (8,006.69 km) |
| Port Huron to Isperih | 5,026.09 mi (8,088.71 km) |
| Port Huron to Kardzhali | 5,070.43 mi (8,160.07 km) |
