| a | | The total surface is 21 040.79 square kilometres, without taking into account the last ruling of The Hague. |
| b | | 2017 |
| c | | Refers to the urban parts of the municipalities San Salvador, Mejicanos, Soyapango, Delgado, Ilopango, Cuscatancingo, Ayutuxtepeque and San Marcos. |
| d | | 2019 |
| e | | 2018 |
| f | | Data classified according to ISIC Rev. 4. |
| g | | Excludes publishing activities. Includes irrigation and canals. |
| h | | Excludes computer and related activities and radio/TV activities. |
| i | | Excludes repair of personal and household goods. |
| j | | Estimate. |
| k | | Urban areas. |
| l | | 2016 |
| m | | Data refers to a 5-year period preceding the reference year. |
| n | | Including refugees. |
| o | | Data as at the end of December. |
| p | | 2008 |
| q | | Data are as at 1 January of reporting year. |
| r | | Population aged 10 years and over. |
| s | | Break in the time series. |