| Harrow to Devnya | 1,416.40 mi (2,279.48 km) |
| Harrow to Dimitrovgrad | 1,382.01 mi (2,224.12 km) |
| Harrow to Dobrich | 1,414.27 mi (2,276.05 km) |
| Harrow to Dospat | 1,341.17 mi (2,158.40 km) |
| Harrow to Dupnitsa | 1,272.57 mi (2,048.00 km) |
| Harrow to Elhovo | 1,416.74 mi (2,280.03 km) |
| Harrow to Etropole | 1,284.28 mi (2,066.84 km) |
| Harrow to Gabrovo | 1,337.50 mi (2,152.49 km) |
| Harrow to Gorna Oryahovitsa | 1,341.99 mi (2,159.72 km) |
| Harrow to Gotse Delchev | 1,327.51 mi (2,136.42 km) |
| Harrow to Harmanli | 1,399.14 mi (2,251.70 km) |
| Harrow to Haskovo | 1,385.56 mi (2,229.84 km) |
| Harrow to Ihtiman | 1,293.31 mi (2,081.38 km) |
| Harrow to Isperih | 1,366.68 mi (2,199.46 km) |
| Harrow to Kardzhali | 1,389.49 mi (2,236.17 km) |
