Torda-Aranyos county was formed in 1876, when the western part of the
Torda County and the
Székely seat of
Aranyosszék (plus small parts of
Alsó-Fehér County) were united. In 1920, by the
Treaty of Trianon, the county became part of Romania. Its territory lies in the present Romanian counties of
Cluj (the north, including Turda),
Alba (the south and west) and
Mureș (the east). ==Demographics==