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ISO 3166-2:SE is the entry for Sweden 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 Sweden, ISO 3166-2 codes are defined for 21 counties.
Each code consists of two parts, separated by a hyphen. The first part is SE, the ISO 3166-1 alpha-2 code of Sweden. The second part is one or two letters, which is the alphabetic code (Swedish: länsbokstav) of the county, and was used in vehicle registration plates until 1973.