ISO 3166-2:HR is the entry for Croatia 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 Croatia, ISO 3166-2 codes are defined for 1 city and 20 counties. The city Zagreb is the capital of the country and has special status equal to the counties.
Each code consists of two parts, separated by a hyphen. The first part is HR, the ISO 3166-1 alpha-2 code of Croatia. The second part is two digits: