The article presents the classification of municipalities in Poland, divided into urbanised and non-urbanised based on their spatial dimensions. The spatial distribution of urbanised municipalities and their basic characteristics are discussed. The classification was performed using the k-means clustering algorithm on the spatial data from Corine Land Cover databases. The comparison of the administrative and land-use driven classification of municipalities in Poland indicates that the widest differences occur between the functional areas of cities and along dynamically developing transport routes, when identification of urbanised areas in terms of land use is taken into consideration.