The 2011 National Census of population and housing was the second census (after the 2002 census) in which the national and ethnic composition of Poland was examined. The new census methodology and order of questions resulted in data that are not yet sufficiently precise. Generally, the number of people declaring non-Polish origins significantly increased, mostly because of very large increases in the Silesian and Kashubian population. According to the new census methodology, new possibilities of data interpretation occurred, mainly as two groups (which are distinct language groups as well) such as: Silesian-Polish, German-Polish, Kashub-Polish met each other at the affiliation point. At the moment analyses of the demographic structures of selected national groups and their localization in Poland are conducted at the level of individual districts (counties). The course of those researches is connected to aspects which include recognition of spatial development conditions in consideration of the demographic differentiation of distinguished subpopulations.
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