| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Ingenio La Fincona | city | Departamento de Sonsonate | El Salvador | 13.6833333 | -89.7333333 | 554 | 129956 |
| Ishuatan | city | Departamento de Sonsonate | El Salvador | 13.61 | -89.5852778 | 1299 | 18635 |
| Ishuatán | city | Departamento de Sonsonate | El Salvador | 13.61 | -89.5852778 | 1299 | 18635 |
| Isla del Cerro | city | Departamento de Sonsonate | El Salvador | 13.8427778 | -89.5602778 | 2463 | 55666 |
| Izalco | city | Departamento de Sonsonate | El Salvador | 13.7447222 | -89.6730556 | 1279 | 136148 |