| Boulder to Argentona | 5,206.56 mi (8,379.14 km) |
| Boulder to Arico el Nuevo | 4,935.26 mi (7,942.54 km) |
| Boulder to Armilla | 5,155.50 mi (8,296.97 km) |
| Boulder to Arnedo | 4,999.37 mi (8,045.71 km) |
| Boulder to Arona | 4,929.95 mi (7,933.98 km) |
| Boulder to Arrecife | 5,047.32 mi (8,122.87 km) |
| Boulder to Arrigorriaga | 4,925.67 mi (7,927.10 km) |
| Boulder to Arroyomolinos | 5,009.46 mi (8,061.94 km) |
| Boulder to Arteijo | 4,693.73 mi (7,553.83 km) |
| Boulder to Arucas | 4,986.06 mi (8,024.29 km) |
| Boulder to Aspe | 5,223.05 mi (8,405.69 km) |
| Boulder to Astorga | 4,828.50 mi (7,770.72 km) |
| Boulder to Atarfe | 5,149.20 mi (8,286.83 km) |
| Boulder to Avila | 4,960.69 mi (7,983.46 km) |
| Boulder to Aviles | 4,789.98 mi (7,708.72 km) |
