What is banque nationale du canadas institution number? Banque Nationale Du Canada's institution number is 006. Banque Nationale Du Canada currently has 1753 routing & transit numbers assigned depending on inpidual branch locations.What are the phone numbers for customer service at national bank? The numbers used for these communications are 1-877-985-4202 or 262-898 (BNC-TXT). National Bank works with specialized business partners to better measure its clientele’s satisfaction.Where is the headquarters of the national bank of canada? The headquarters of the National Bank of Canada is located in Tour de la Banque Nationale. National Bank of Canada Office in Toronto.What is the history of the banque nationale? In 1859, francophone businessmen in Ontario and Quebec were keen to establish a bank under their local control, and persuade the provincial legislature to pass the act that created the Banque Nationale on May 4, 1859.