| San Marcos to Anoka (Minnesota) | 1,513.87 mi (2,436.34 km) |
| San Marcos to Ansonia (Connecticut) | 2,463.76 mi (3,965.04 km) |
| San Marcos to Antelope (California) | 451.01 mi (725.83 km) |
| San Marcos to Anthem (Arizona) | 295.60 mi (475.73 km) |
| San Marcos to Antioch (California) | 423.53 mi (681.60 km) |
| San Marcos to Antioch (Illinois) | 1,704.12 mi (2,742.52 km) |
| San Marcos to Apache Junction (Arizona) | 326.25 mi (525.06 km) |
| San Marcos to Apex (North Carolina) | 2,176.25 mi (3,502.33 km) |
| San Marcos to Apollo Beach (Florida) | 2,094.51 mi (3,370.79 km) |
| San Marcos to Apopka (Florida) | 2,124.58 mi (3,419.18 km) |
| San Marcos to Apple Valley (California) | 96.77 mi (155.73 km) |
| San Marcos to Apple Valley (Minnesota) | 1,508.96 mi (2,428.44 km) |
| San Marcos to Appleton (Wisconsin) | 1,720.23 mi (2,768.44 km) |
| San Marcos to Arbutus (Maryland) | 2,277.17 mi (3,664.75 km) |
| San Marcos to Arcadia (California) | 85.03 mi (136.85 km) |
