The article deals with the administrative development of the area of the former Municipality of Ljubljana Vič - Rudnik. The implementation of the communal system in 1955 led to larger changes in the organisation and range of municipalities. Their number began decreasing, and city areas began connecting with rural areas. This is illustrated by the Municipality of Ljubljana Rudnik. The process of merging continued until 1961, when the large Municipality of Ljubljana Vič Rudnik was formed as well. One of the more significant reasons for merging Vič and Rudnik into one municipality was the authorities’ goal of achieving a more uniform economic development of city areas and rural areas. The article also shows the economic foundations of the former municipalities of Ljubljana Vič and Ljubljana Rudnik as well as the consequences the administrative merging had on the development of the area.