Kolozs County was formed in the 11th century. In 1876, when the administrative structure of
Transylvania was changed, the territory of Kolozs was modified and some villages of
Doboka County (which was then disbanded) were annexed to it. In 1920, by the
Treaty of Trianon, the county became part of Romania. Following the
Second Vienna Award, large part of it was retaken by Hungary in 1940 and the county was recreated; however, after
World War II it became part of Romania again. Most of the territory of the county lies in the present Romanian county
Cluj, some parts of the county are in the present Romanian counties
Sălaj (north-west),
Bistrița-Năsăud (north-east), and
Mureș (south-east). ==Demographics==