| Harrow to Ames | 713.88 mi (1,148.89 km) |
| Harrow to Amorebieta | 588.53 mi (947.14 km) |
| Harrow to Amposta | 752.54 mi (1,211.10 km) |
| Harrow to Amurrio | 602.29 mi (969.29 km) |
| Harrow to Andoain | 583.31 mi (938.74 km) |
| Harrow to Andraitx | 840.30 mi (1,352.33 km) |
| Harrow to Andujar | 952.96 mi (1,533.63 km) |
| Harrow to Antequera | 1,027.26 mi (1,653.21 km) |
| Harrow to Antigua | 1,749.87 mi (2,816.14 km) |
| Harrow to Aranda de Duero | 701.93 mi (1,129.65 km) |
| Harrow to Aranjuez | 813.10 mi (1,308.55 km) |
| Harrow to Archena | 931.74 mi (1,499.49 km) |
| Harrow to Arcos de la Frontera | 1,059.19 mi (1,704.60 km) |
| Harrow to Arenys de Mar | 704.46 mi (1,133.72 km) |
| Harrow to Arenys de Munt | 702.27 mi (1,130.19 km) |
