ISO 3166-2:PL is the entry for Poland 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 Poland, ISO 3166-2 codes are defined for 16 provinces.
Each code consists of two parts, separated by a hyphen. The first part is PL, the ISO 3166-1 alpha-2 code of Poland. The second part is two letters.
Read more about ISO 3166-2:PL: Current Codes, Changes