Member for Northern Tablelands Adam Marshall offered his support to the listing and said both churches were not only important for their religious significance but added to the rich heritage of the city of Armidale.
"These are Armidale's most iconic buildings and it's a great thing that they are being considered for heritage listing as this will help preserve them for future generations," Mr Marshall said.
Built and opened for worship in 1875, the Anglican Cathedral Church was the first cathedral to be constructed in what was then considered by religious hierarchy as a regional outpost.
The design was a collaborative effort between prominent architect John Horbury Hunt and Bishop James Francis Turner and the intricately detailed building is regarded as one of Hunt's finest works.
Canadian by birth, Hunt revolutionized Australian architecture and was responsible for some of its most powerful and austere landmarks. He also designed Booloominbah for Armidale's first family, the Whites.
Anglican Bishop of Armidale, the Right Reverend Rick Lewers said the cathedral was a great gift from the past and it was important to preserve it for the future.
"It is not only the heritage of brick and mortar, but the heritage of a community. The people who have gathered here and worshiped in the cathedral are the main gift," Bishop Lewers said.
St Mary and St Joseph Catholic Cathedral when built in 1911-12 was considered to be the finest Catholic cathedral in Australia.
It was designed by prominent architectural firm, Sherrin and Hennessy and was the centre of the first order of the Ursuline Sisters who had settled in Armidale in 1882.