| Harrow to Aleksandrow Lodzki | 839.05 mi (1,350.33 km) |
| Harrow to Andrychow | 866.77 mi (1,394.93 km) |
| Harrow to Augustow | 984.13 mi (1,583.80 km) |
| Harrow to Banino | 801.12 mi (1,289.28 km) |
| Harrow to Barlinek | 662.89 mi (1,066.82 km) |
| Harrow to Bartoszyce | 896.43 mi (1,442.67 km) |
| Harrow to Bedzin | 848.90 mi (1,366.17 km) |
| Harrow to Belchatow | 845.91 mi (1,361.37 km) |
| Harrow to Biala Podlaska | 998.46 mi (1,606.87 km) |
| Harrow to Bialogard | 700.68 mi (1,127.64 km) |
| Harrow to Bialy Kamien | 719.54 mi (1,157.99 km) |
| Harrow to Bialystok | 992.51 mi (1,597.29 km) |
| Harrow to Bielawa | 736.19 mi (1,184.79 km) |
| Harrow to Bielsk Podlaski | 996.54 mi (1,603.78 km) |
| Harrow to Bielsko-Biala | 854.62 mi (1,375.38 km) |
