DCHP-1 Online
Columbia Department Hist. 
the administrative district of the Hudson's Bay Company occupying approximately what are now Oregon, Washington, and southern British Columbia.
See also: Columbia (def. 1)
- 1821 (1889-1890) A kind of demi-official report is in circulation that the Company have come to the conclusive resolve of evacuating the Columbia Department altogether.
- 1921 The country was also known as Columbia District. . . .
- 1946 . . . the Columbia Department extended over the whole vast watershed of the Columbia River, which includes most of the states of Washington and Oregon.
- 1821 (1889-1890) A kind of demi-official report is in circulation that the Company have come to the conclusive resolve of evacuating the Columbia Department altogether.