The regions represented the result of a Soviet-inspired experiment regarding the administrative and territorial organisation of the Romanian People's Republic (later Socialist Republic of Romania) between 1950 and 1968.
See also: Administrative divisions of the People's Republic of Romania.
1956 – An intermediary step in which the regions Arad and Bârlad were absorbed by their neighbours.
1960 – As of 24 December, the final step, with territory redistribution and some regions renamed.
The Magyar administrative entity was renamed Regiunea Mureș-Autonomă Maghiară (Mureș Region – Magyar Autonomous), also modifying its territory.