 Initially Longleng was under the district administration of Tuensang District but later on it was bifurcated as a separate district in January 2004

Carved out of Tuensang district, Longleng is tenth district of Nagaland.It is bordered by Mon district in the north, Mokokchung district in the west and Tuensang district in the south.The district's headquarters is Longleng, which is at an altitude of about 1,066 m above sea level.