This reform would further reduce the number of municipalities in Denmark, and replace the counties with regions.
The parish municipalities belonged to 24 counties while the market towns were under direct control of the Ministry of the Interior.
In 1958, interior minister Søren Olesen (da) began what would eventually lead to the 1970 Municipal Reform.
The concept of market towns was abandoned, with Copenhagen and Frederiksberg being the only municipalities not part of a county after the reform.
The last bits of the reform were not fully implemented until 1 April 1974 when the number of municipalities was further reduced to 275.