| Harrow to Argentona | 704.91 mi (1,134.45 km) |
| Harrow to Arico el Nuevo | 1,819.84 mi (2,928.75 km) |
| Harrow to Armilla | 1,010.00 mi (1,625.43 km) |
| Harrow to Arnedo | 652.41 mi (1,049.95 km) |
| Harrow to Arona | 1,829.98 mi (2,945.06 km) |
| Harrow to Arrecife | 1,704.83 mi (2,743.66 km) |
| Harrow to Arrigorriaga | 590.68 mi (950.61 km) |
| Harrow to Arroyomolinos | 800.10 mi (1,287.64 km) |
| Harrow to Arteijo | 686.66 mi (1,105.08 km) |
| Harrow to Arucas | 1,801.89 mi (2,899.86 km) |
| Harrow to Aspe | 914.89 mi (1,472.37 km) |
| Harrow to Astorga | 685.03 mi (1,102.45 km) |
| Harrow to Atarfe | 1,005.58 mi (1,618.33 km) |
| Harrow to Avila | 783.11 mi (1,260.30 km) |
| Harrow to Aviles | 611.82 mi (984.63 km) |
