| San Marcos to Commerce (California) | 81.91 mi (131.82 km) |
| San Marcos to Commerce City (Colorado) | 826.55 mi (1,330.20 km) |
| San Marcos to Compton (California) | 80.14 mi (128.98 km) |
| San Marcos to Comstock Park (Michigan) | 1,831.10 mi (2,946.87 km) |
| San Marcos to Concord (California) | 430.36 mi (692.60 km) |
| San Marcos to Concord (Missouri) | 1,541.60 mi (2,480.97 km) |
| San Marcos to Concord (New Hampshire) | 2,539.78 mi (4,087.39 km) |
| San Marcos to Concord (North Carolina) | 2,080.39 mi (3,348.07 km) |
| San Marcos to Conneaut (Ohio) | 2,078.02 mi (3,344.26 km) |
| San Marcos to Connersville (Indiana) | 1,827.12 mi (2,940.47 km) |
| San Marcos to Conroe (Texas) | 1,287.10 mi (2,071.39 km) |
| San Marcos to Converse (Texas) | 1,139.65 mi (1,834.08 km) |
| San Marcos to Conway (Arkansas) | 1,416.09 mi (2,278.98 km) |
| San Marcos to Conway (Florida) | 2,140.41 mi (3,444.65 km) |
| San Marcos to Conway (South Carolina) | 2,185.08 mi (3,516.54 km) |
