ISO 3166-2:SL is the entry for Sierra Leone in ISO 3166-2, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), which defines codes for the names of the principal subdivisions (e.g. provinces or states) of all countries coded in ISO 3166-1.
Currently for Sierra Leone, ISO 3166-2 codes are defined for one area and four provinces. The Western Area contains the capital of the country Freetown and has special status equal to the provinces.
Each code consists of two parts, separated by a hyphen. The first part is SL, the ISO 3166-1 alpha-2 code of Sierra Leone. The second part is one or two letters.