| Keystone to Arcos de Valdevez | 4,174.66 mi (6,718.46 km) |
| Keystone to Arcozelo | 4,175.65 mi (6,720.07 km) |
| Keystone to Arganil | 4,218.91 mi (6,789.68 km) |
| Keystone to Arouca | 4,197.60 mi (6,755.39 km) |
| Keystone to Arruda dos Vinhos | 4,186.96 mi (6,738.25 km) |
| Keystone to Aveiro | 4,181.73 mi (6,729.85 km) |
| Keystone to Aver-o-Mar | 4,163.74 mi (6,700.89 km) |
| Keystone to Aves | 4,186.87 mi (6,738.12 km) |
| Keystone to Azambuja | 4,195.99 mi (6,752.79 km) |
| Keystone to Baiao | 4,204.64 mi (6,766.72 km) |
| Keystone to Barcelos | 4,169.71 mi (6,710.50 km) |
| Keystone to Barreiro | 4,192.24 mi (6,746.76 km) |
| Keystone to Batalha | 4,189.82 mi (6,742.87 km) |
| Keystone to Beja | 4,265.30 mi (6,864.33 km) |
| Keystone to Belas | 4,179.71 mi (6,726.59 km) |
