The aim of the study is to conduct a statistical analysis of population changes in Poland's municipalities in 2021 compared to 2011 using national censuses data. Population changes in cities and their surroundings play a crucial role in shaping urban environments, economies, and societies. Monitoring these changes is essential for various reasons, including urban planning, resource allocation, and environmental conservation. Firstly, understanding population trends empowers city officials and planners to make well-informed decisions that promote sustainable urban growth. Secondly, effective resource allocation is dependent on accurate population data. By tracking the changes in the population, city administrators can ensure equitable distribution of resources, such as healthcare, education, and public safety. Thirdly, monitoring population changes enables cities to gauge the economic and social impacts of demographic shifts. The conducted study takes into account the analysis of changes in the population in two dimensions. The first is the analysis of population changes in relative terms. The second dimension refers to identifying patterns in population changes. Determining the main directions of population shifts will identify those areas where an influx of population will be associated with challenges for local authorities related to new investment needs in public infrastructure, and areas where a decline in population will be associated with a decline in income for local authorities and difficulties in implementing both current policies and future investments.