The Nomenclature of Territorial Units for Statistical Purposes (NTS) was an ordered list of names of territorial units and their territorial symbols. These units were organized both into different levels of territorial division of the country and two additional statistical levels (grouping smaller units of territorial division). The NTS nomenclature was used in the process of collection, storage, processing and analysis of statistical data as well as in publication, sharing and dissemination of statistical research results in territorial breakdowns. The nomenclature was introduced by the Regulation of the Council of Ministers of 13 July 2000 (entered into force on 8 August 2000) and was abolished on 1 January 2018.
The NTS nomenclature was developed on the basis of the Classification of Territorial Units for Statistics (NUTS) used in the European Union, and the Polish National Official Register of the Territorial Division of the Country (TERYT). The NTS nomenclature was based on the existing three-level division of the country into voivodships, powiats and gminas. On this basis two additional non-administrative levels, i.e. regions and subregions, were established.
The NTS nomenclature divided Poland into hierarchically related territorial units at five levels – three of them were defined as regional and following two as local. Each unit of the lower level was included only in one unit of the higher level. However, a particular territorial unit might have represented at several NTS levels.
Regional levels consisted of:
- NTS 1 level – regions (grouping voivodships)
- NTS 2 level – voivodships
- NTS 3 level – subregions (grouping powiats)
Local levels consisted of:
- NTS 4 level – powiats (including cities with powiat status)
- NTS 5 level – gminas (and in addition: urban parts of urban-rural gminas, rural parts of urban-rural gminas, districts of Warsaw, representations of Kraków, Łódź, Poznań, and Wrocław)