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ISO 3166-2  : IE is the entry for Ireland in ISO 3166-2 , part of the ISO 3166 standard published by the International Organization for Standardization -LRB- ISO -RRB- , which defines codes for the names of the principal subdivisions -LRB- e.g. , provinces or states -RRB- of all countries coded in ISO 3166-1 .. Ireland. Republic of Ireland. ISO 3166-2. ISO 3166-2. ISO 3166. ISO 3166. standard. standardization. International Organization for Standardization. International Organization for Standardization. countries. country. ISO 3166-1. ISO 3166-1. Currently for Ireland , ISO 3166-2 codes are defined for two levels of subdivisions  :. Ireland. Republic of Ireland. ISO 3166-2. ISO 3166-2. ISO 3166. ISO 3166. 4 provinces. 4 provinces. provinces of Ireland. 26 counties. 26 counties. counties of the Republic of Ireland. The 26 counties are traditional counties , which are different from the first-level administrative subdivisions of Ireland .. Ireland. Republic of Ireland. 26 counties. counties of the Republic of Ireland. first-level administrative subdivisions of Ireland. local government in the Republic of Ireland. Each code consists of two parts , separated by a hyphen .. code. code. The first part is , the ISO 3166-1 alpha-2 code of Ireland .. Ireland. Republic of Ireland. ISO 3166. ISO 3166. code. code. ISO 3166-1. ISO 3166-1. ISO 3166-1 alpha-2. ISO 3166-1 alpha-2. The second part is one or two letters .. For the counties , the letters are generally the same as those currently used in vehicle registration plates , with the following exceptions  :. vehicle registration plates. vehicle registration plates of Ireland. County Cork vehicles rather than use ; in ISO 3166-2 the latter is used for the province of Connacht .. ISO 3166-2. ISO 3166-2. ISO 3166. ISO 3166. province. province. County Cork. County Cork. Connacht. Connacht. three counties where there were multiple councils and vehicle codes until the Local Government Reform Act 2014  :. Local Government Reform Act 2014. Local Government Reform Act 2014. County Limerick vehicles rather than now use , which was restricted to the city of Limerick before 2014. County Limerick. County Limerick. Limerick. Limerick. County Waterford vehicles rather than now use , which was restricted to the city of Waterford before 2014. County Waterford. County Waterford. Waterford. Waterford. County Tipperary vehicles rather than use .. County Tipperary. County Tipperary. Before 2014 North Tipperary and South Tipperary used and respectively .. North Tipperary. North Tipperary. South Tipperary. South Tipperary