The work has two goals: 1) to identify the dominant charges in complaints to administrative courts regarding land use plans for municipalities (gminy), to assess their legitimacy and effectiveness, and to classify the complainants; 2) to show that the court rulings are related to the diversity of municipalities, i.e., their character (morphology, social and economic functions, etc.) and characteristics of socio-economic development. All the judgments of voivodship (regional) administrative courts issued in 2010–2019 concerning complaints about municipal plans were analysed (531). The problem turns out to be the undefined scope of such plans, which, however, does not affect the extent to which these instruments are challenged by property owners. A high concentration of complaints in the regional capitals and their suburban areas is also demonstrated.