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Statistical units are units for the distribution or use of statistical data. The statistical units consist of Statistical Circle, Census Circle and Polling Station Area. It contains data on: registration number or code of the spatial unit, type of spatial unit, hierarchical connection with superior and subordinate spatial units, geospatial data and history of change. The statistical circle is the smallest constant spatial unit. The network of statistical circles is formed within the settlement - inhabited place, ie within the cadastral municipality. One statistical circle can contain one or more census circles. The census circle is the smallest spatial unit about which data are kept in the Register of Spatial Units and which is formed for needs census, for the purpose of precise distribution of enumerators in the field and ensuring complete coverage of census units. When defining local communities whose border is part of a statistical circle, the border is defined by census circles. The criteria for determining the size of the census circle are the number of households and the character of the settlement. For each polling station, the area of the polling station is determined, from which voters vote at that polling station (street, village, hamlet, settlement, etc.) and which usually includes a list of streets with house numbers, the name of the settlement, etc. Statistical units also consist of spatial units defined by the nomenclature of statistical territorial units (NSTJ): Serbia-North and Serbia-South (NSTJ1), regions (NSTJ2) and areas (NSTJ3). NSTJ grouping levels are provided by aggregating territorial units. The nomenclature of statistical territorial units is a set of terms, names and symbols that describe groups of territorial units with levels of grouping. The criteria according to which the NSTJ levels are grouped are based on general criteria determined by the standards of the European Union: number of inhabitants, geopolitical position, natural potentials, existing territorial organization, cultural - historical heritage.