| Boulder to Arcata (California) | 989.58 mi (1,592.57 km) |
| Boulder to Archdale (North Carolina) | 1,401.90 mi (2,256.15 km) |
| Boulder to Arden-Arcade (California) | 866.75 mi (1,394.91 km) |
| Boulder to Ardmore (Oklahoma) | 601.81 mi (968.52 km) |
| Boulder to Ardmore (Pennsylvania) | 1,577.72 mi (2,539.09 km) |
| Boulder to Arecibo (Puerto Rico) | 2,727.42 mi (4,389.35 km) |
| Boulder to Arkadelphia (Arkansas) | 784.37 mi (1,262.32 km) |
| Boulder to Arkansas City (Kansas) | 488.21 mi (785.70 km) |
| Boulder to Arlington (Tennessee) | 912.44 mi (1,468.44 km) |
| Boulder to Arlington (Texas) | 678.07 mi (1,091.25 km) |
| Boulder to Arlington (Virginia) | 1,497.74 mi (2,410.38 km) |
| Boulder to Arlington (Washington) | 1,006.11 mi (1,619.18 km) |
| Boulder to Arlington Heights (Illinois) | 909.41 mi (1,463.55 km) |
| Boulder to Arnold (Maryland) | 1,527.13 mi (2,457.68 km) |
| Boulder to Arnold (Missouri) | 802.99 mi (1,292.29 km) |
