This empirical-analytical paper deals with the topic of the classification of Austrian municipalities in connection with economic aspects and economic sectors. In the course of this research, the corresponding nomenclatures, differences, and similarities at the international level were considered. In Austria, it is necessary to remain strategic and competitive for 2098 municipalities, to regularly adapt and optimize the administration to the changing times. The focus is also on aspects such as comparability, transparency and efficiency. Classifications are important tools when it comes to comparability and optimization. Municipalities have a very extensive and diverse range of tasks and services. A classification based on economic characteristics is a meaningful method for a specified assignment. So far, only classifications according to municipality codes or population sizes are known, which provide comparatively inaccurate results. Thus a supplementary classification by economic sectors appears to be particularly valuable. The aim of the work was to present an optimal or meaningful classification of Austrian municipalities by industry and to find out which data should be used. The main part of the thesis is to present three different Austrian models that represent approaches to economic activity classifications at the community level. Among other things, helpful tools such as international, european and national nomenclatures are presented and defined, as they contain all valid and important economic categories. The relevant economic categories include agriculture, industry and tourism. In order to also include the international context, approaches of such classifications in Germany and Switzerland were also examined and discussed in more detail.