the largest of the administrative divisions of the Hudson's Bay Company. See 1956 quote.
1824  (1931)  I do not conceive that the business of the Northn Deptmt requires at any time exceeding Twenty Clerks whose Education & abilities should lead them to expect preferment in the Service, while there are Thirty Four commissioned Gentlemen attached thereto.
1956  The Hudson Bay Company's Northern Department extended from Hudson Bay to the Rocky Mountains and from the United States Boundary to the Arctic Ocean.
1963  On July 5 [1823] the Council of the Northern Department of Rupert's Land appointed Grant . . . to be clerk in Lower Red River for three years at a salary of not more than £120.