| San Marcos to Jeffersontown (Kentucky) | 1,799.12 mi (2,895.40 km) |
| San Marcos to Jeffersonville (Indiana) | 1,792.20 mi (2,884.27 km) |
| San Marcos to Jenison (Michigan) | 1,821.85 mi (2,931.98 km) |
| San Marcos to Jenks (Oklahoma) | 1,219.84 mi (1,963.15 km) |
| San Marcos to Jennings (Missouri) | 1,548.10 mi (2,491.42 km) |
| San Marcos to Jensen Beach (Florida) | 2,231.17 mi (3,590.72 km) |
| San Marcos to Jericho (New York) | 2,440.18 mi (3,927.08 km) |
| San Marcos to Jerome (Idaho) | 677.68 mi (1,090.62 km) |
| San Marcos to Jersey City (New Jersey) | 2,412.74 mi (3,882.93 km) |
| San Marcos to Jessup (Maryland) | 2,272.87 mi (3,657.83 km) |
| San Marcos to Johns Creek (Georgia) | 1,890.62 mi (3,042.67 km) |
| San Marcos to Johnson City (New York) | 2,314.79 mi (3,725.30 km) |
| San Marcos to Johnson City (Tennessee) | 1,977.26 mi (3,182.09 km) |
| San Marcos to Johnston (Iowa) | 1,410.19 mi (2,269.49 km) |
| San Marcos to Johnstown (Colorado) | 839.33 mi (1,350.78 km) |
