| San Marcos to Groveton (Virginia) | 2,256.80 mi (3,631.96 km) |
| San Marcos to Grovetown (Georgia) | 2,009.90 mi (3,234.62 km) |
| San Marcos to Guayama (Puerto Rico) | 3,315.83 mi (5,336.31 km) |
| San Marcos to Guaynabo (Puerto Rico) | 3,302.13 mi (5,314.26 km) |
| San Marcos to Gulf Shores (Alabama) | 1,737.95 mi (2,796.96 km) |
| San Marcos to Gulfport (Florida) | 2,076.95 mi (3,342.52 km) |
| San Marcos to Gulfport (Mississippi) | 1,656.25 mi (2,665.48 km) |
| San Marcos to Gunbarrel (Colorado) | 818.80 mi (1,317.73 km) |
| San Marcos to Gurnee (Illinois) | 1,709.21 mi (2,750.70 km) |
| San Marcos to Guthrie (Oklahoma) | 1,137.49 mi (1,830.61 km) |
| San Marcos to Guttenberg (New Jersey) | 2,415.94 mi (3,888.08 km) |
| San Marcos to Guymon (Oklahoma) | 921.44 mi (1,482.91 km) |
| San Marcos to Hacienda Heights (California) | 75.23 mi (121.07 km) |
| San Marcos to Hackensack (New Jersey) | 2,413.62 mi (3,884.34 km) |
| San Marcos to Hackettstown (New Jersey) | 2,372.95 mi (3,818.89 km) |
