| Difficult Run to Ames | 3,497.62 mi (5,628.87 km) |
| Difficult Run to Amorebieta | 3,766.48 mi (6,061.57 km) |
| Difficult Run to Amposta | 3,993.15 mi (6,426.36 km) |
| Difficult Run to Amurrio | 3,758.53 mi (6,048.77 km) |
| Difficult Run to Andoain | 3,799.80 mi (6,115.18 km) |
| Difficult Run to Andraitx | 4,115.20 mi (6,622.77 km) |
| Difficult Run to Andujar | 3,850.39 mi (6,196.61 km) |
| Difficult Run to Antequera | 3,855.97 mi (6,205.59 km) |
| Difficult Run to Antigua | 3,641.14 mi (5,859.85 km) |
| Difficult Run to Aranda de Duero | 3,763.68 mi (6,057.06 km) |
| Difficult Run to Aranjuez | 3,813.84 mi (6,137.77 km) |
| Difficult Run to Archena | 3,982.49 mi (6,409.20 km) |
| Difficult Run to Arcos de la Frontera | 3,802.39 mi (6,119.35 km) |
| Difficult Run to Arenys de Mar | 4,058.66 mi (6,531.78 km) |
| Difficult Run to Arenys de Munt | 4,057.25 mi (6,529.51 km) |
