| San Marcos to University Place (Washington) | 1,012.66 mi (1,629.73 km) |
| San Marcos to Upland (California) | 73.44 mi (118.19 km) |
| San Marcos to Upper Arlington (Ohio) | 1,938.40 mi (3,119.55 km) |
| San Marcos to Upper Grand Lagoon (Florida) | 1,853.19 mi (2,982.42 km) |
| San Marcos to Upper Montclair (New Jersey) | 2,405.63 mi (3,871.48 km) |
| San Marcos to Urbana (Illinois) | 1,669.11 mi (2,686.18 km) |
| San Marcos to Urbana (Maryland) | 2,242.23 mi (3,608.52 km) |
| San Marcos to Urbana (Ohio) | 1,902.68 mi (3,062.07 km) |
| San Marcos to Urbandale (Iowa) | 1,406.29 mi (2,263.20 km) |
| San Marcos to Utica (New York) | 2,354.83 mi (3,789.74 km) |
| San Marcos to Uvalde (Texas) | 1,062.01 mi (1,709.13 km) |
| San Marcos to Vacaville (California) | 449.85 mi (723.96 km) |
| San Marcos to Vadnais Heights (Minnesota) | 1,523.36 mi (2,451.61 km) |
| San Marcos to Vail (Arizona) | 385.00 mi (619.60 km) |
| San Marcos to Valdosta (Georgia) | 1,983.92 mi (3,192.81 km) |
