Northwest Territories is as of now utilizing one zone code. Northwest Territories isn't using any region code overlay designs.
Region code 867 was framed in 1997 from a split of zone code 403 and 819. Zone code 403 initially secured Alberta, Yukon and parts of the Northwest Territories. Zone code 819 secured Quebec. In 1997 zone code 403 was part, alongside a segment of territory code 819, to frame region code 867 which covers Yukon, Northwest Territories and Nunavut.
Changes and History of Northwest Territories Area Codes:
Region code 867 was put into benefit. Region code 867 was made from a part of zone codes 403 and 819.