Most of the island is in Northwest Territories, while its easternmost portion lies in Nunavut.

Mackenzie King has an area of 5,048 km2 (1,949 sq mi), 60 miles (97 km) long in northeast or 47 miles (76 km) in southeast and 60 miles (97 km) wide, making it the 116th largest island in the world, and Canada's 26th largest island.

The first known visit to the island was by Vilhjalmur Stefansson in 1915, and it was later named for William Lyon Mackenzie King.

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