| Boulder to Anoka (Minnesota) | 700.50 mi (1,127.34 km) |
| Boulder to Ansonia (Connecticut) | 1,679.01 mi (2,702.10 km) |
| Boulder to Antelope (California) | 863.97 mi (1,390.42 km) |
| Boulder to Anthem (Arizona) | 570.02 mi (917.37 km) |
| Boulder to Antioch (California) | 898.12 mi (1,445.39 km) |
| Boulder to Antioch (Illinois) | 906.72 mi (1,459.23 km) |
| Boulder to Apache Junction (Arizona) | 574.72 mi (924.92 km) |
| Boulder to Apex (North Carolina) | 1,463.34 mi (2,355.02 km) |
| Boulder to Apollo Beach (Florida) | 1,553.39 mi (2,499.93 km) |
| Boulder to Apopka (Florida) | 1,555.53 mi (2,503.39 km) |
| Boulder to Apple Valley (California) | 758.03 mi (1,219.93 km) |
| Boulder to Apple Valley (Minnesota) | 695.21 mi (1,118.83 km) |
| Boulder to Appleton (Wisconsin) | 910.43 mi (1,465.20 km) |
| Boulder to Arbutus (Maryland) | 1,514.16 mi (2,436.81 km) |
| Boulder to Arcadia (California) | 812.63 mi (1,307.80 km) |
