En todo el mundo existen al menos 21 ciudades llamadas San Marcos. A continuación se encuentra la información geográfica de todas estas ciudades.
| # | País | Región | Ciudad | Coordenadas |
|---|---|---|---|---|
| 1 | Estados Unidos | California | San Marcos | 33.143, -117.166 |
| 2 | México | Jalisco | San Marcos | 20.793, -104.197 |
| 3 | México | Durango | San Marcos | 24.296, -103.545 |
| 4 | México | Coahuila de Zaragoza | San Marcos | 25.667, -103.009 |
| 5 | México | Zacatecas | San Marcos | 22.277, -101.952 |
| 6 | México | Guanajuato | San Marcos | 20.937, -101.344 |
| 7 | México | Guerrero | San Marcos | 16.798, -99.389 |
| 8 | México | Hidalgo | San Marcos | 20.031, -99.335 |
| 9 | Estados Unidos | Texas | San Marcos | 29.883, -97.941 |
| 10 | México | Veracruz-Llave | San Marcos | 19.424, -96.964 |
| 11 | México | Chiapas | San Marcos | 16.958, -92.212 |
| 12 | Guatemala | San Marcos | San Marcos | 14.964, -91.794 |
| 13 | El Salvador | San Salvador | San Marcos | 13.661, -89.183 |
| 14 | Honduras | Ocotepeque | San Marcos | 14.4, -88.95 |
| 15 | Honduras | Santa Bárbara | San Marcos | 15.3, -88.417 |
| 16 | Honduras | Choluteca | San Marcos | 13.433, -86.8 |
| 17 | Nicaragua | Carazo | San Marcos | 11.909, -86.204 |
| 18 | Costa Rica | San José | San Marcos | 9.66, -84.02 |
| 19 | Perú | Cajamarca | San Marcos | -7.333, -78.183 |
| 20 | Perú | Ancash | San Marcos | -9.525, -77.157 |
| 21 | Colombia | Sucre | San Marcos | 8.66, -75.128 |
