| San Marcos to Owosso (Michigan) | 1,905.06 mi (3,065.89 km) |
| San Marcos to Oxford (Alabama) | 1,799.83 mi (2,896.55 km) |
| San Marcos to Oxford (Mississippi) | 1,585.33 mi (2,551.33 km) |
| San Marcos to Oxford (Ohio) | 1,847.48 mi (2,973.23 km) |
| San Marcos to Oxnard (California) | 136.75 mi (220.07 km) |
| San Marcos to Oxon Hill (Maryland) | 2,263.45 mi (3,642.67 km) |
| San Marcos to Ozark (Alabama) | 1,838.15 mi (2,958.22 km) |
| San Marcos to Ozark (Missouri) | 1,377.27 mi (2,216.50 km) |
| San Marcos to Pace (Florida) | 1,763.20 mi (2,837.60 km) |
| San Marcos to Pacific Grove (California) | 361.13 mi (581.18 km) |
| San Marcos to Pacifica (California) | 429.90 mi (691.85 km) |
| San Marcos to Paducah (Kentucky) | 1,629.19 mi (2,621.93 km) |
| San Marcos to Pahrump (Nevada) | 223.62 mi (359.88 km) |
| San Marcos to Painesville (Ohio) | 2,041.67 mi (3,285.75 km) |
| San Marcos to Palatine (Illinois) | 1,700.38 mi (2,736.50 km) |
