| San Marcos to Hutchinson (Kansas) | 1,132.26 mi (1,822.20 km) |
| San Marcos to Hutchinson (Minnesota) | 1,460.71 mi (2,350.79 km) |
| San Marcos to Hutto (Texas) | 1,164.36 mi (1,873.86 km) |
| San Marcos to Hyattsville (Maryland) | 2,263.88 mi (3,643.36 km) |
| San Marcos to Hybla Valley (Virginia) | 2,257.69 mi (3,633.40 km) |
| San Marcos to Idaho Falls (Idaho) | 767.18 mi (1,234.66 km) |
| San Marcos to Idylwood (Virginia) | 2,250.62 mi (3,622.02 km) |
| San Marcos to Ilchester (Maryland) | 2,273.16 mi (3,658.30 km) |
| San Marcos to Immokalee (Florida) | 2,182.36 mi (3,512.17 km) |
| San Marcos to Imperial (California) | 95.09 mi (153.03 km) |
| San Marcos to Imperial Beach (California) | 39.22 mi (63.12 km) |
| San Marcos to Independence (Kentucky) | 1,855.96 mi (2,986.88 km) |
| San Marcos to Independence (Missouri) | 1,334.52 mi (2,147.70 km) |
| San Marcos to Indian Trail (North Carolina) | 2,082.53 mi (3,351.50 km) |
| San Marcos to Indiana (Pennsylvania) | 2,146.21 mi (3,453.99 km) |
