Events from the year 1804 in Canada.

This article relies largely or entirely on a single source. (December 2009)

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• Monarch: George III^[1]

• October 8 – HMS Speedy sinks during a snowstorm.
• David Thompson works in Peace River country.
• Lewis and Clark start up the Missouri River.
• Merger of the North West Company and XY Fur Companies. The XY Company is absorbed by the North West Company.
• 1,400 American ships are fishing off Labrador and in the Gulf of St. Lawrence.
• The earliest Fraktur paintings appear in Lincoln County, Upper Canada.
• Russians return to Sitka and attack Kiksadi fort on Indian River. Russians lose the battle, but Natives are forced to flee. Baranov re-establishes trading post.
• Locks are placed at Coteau, the Cascades and at Long Sault.

• February 29 – Antoine Plamondon, artist (d.1895)
• May 12 – Robert Baldwin, politician (d.1858)
• December 13 – Joseph Howe, Premier of Nova Scotia (d.1873)

• July 6 – Simon McTavish, fur trader and dealer in furs, militia officer, office holder, landowner, seigneur, and businessman (b.1750)