Abstract: | ABSTRACTThe aim of the article is to explain the phenomena of mergers and territorial disintegration of Polish towns and cities from three perspectives: social, economic and spatial-primal. Administrative border changes are fundamental components of local urban policy guidelines in countries that have experienced a dual history in the socialist and post-socialist periods, such as Poland. The main method of the authors research was the application of statistical and cartographic methods focused on measuring quantitative administrative changes in urban areas and their demographic effects. The scope of the research covered all towns in Poland existing in the years 1945–2018. Since the changes in the administrative boundaries of cities particularly concern the rural areas in the vicinity of large cities, the suburban municipalities surrounding urban centres were analysed too. The findings underline the deterministic role of political systems in the territorial expansion of towns and cities, and indicates their role for current planning decisions. The authors conclude that noticeable differences between two analysed periods have had at least two significant causes. First, the political and economic systems determining the changes differed, and second, each system was accompanied by differing directions of economic development and therefore also different ‘urbogenic’ forces. |