Urban and rural environments are often perceived as different social worlds with their own economic, social and cultural relations. One of the encounters of such worlds would then be a suburbanization process that turns the countryside into the hinterland of our cities. In this paper, we will focus on changes in the political behaviour of the population in connection with this process, in which not only the physical environment of the conurbations is transformed, but also the social and cultural characteristics of the local population significantly change. Using the data from the elections to the National Council of the Slovak Republic in the years 1998 – 2016, we will mainly monitor changes in support of the urban parties, which to a certain extent reflect the changing social structure in this area. Although the paper deals with only one specific aspect of suburbanization, we believe that understanding and interpreting changes in electoral behaviour is part of the mosaic of complex social and cultural transformation of the urban hinterland.