Pfeiffer Lake is an unorganized territory in Saint Louis County, Minnesota, United States.
According to the United States Census Bureau, the unorganized territory has a total area of 36.3 square miles (94.1 km2); 36.2 square miles (93.7 km2) is land and 0.2 square mile (0.4 km2) (0.47%) is water.
As of the census[1] of 2000, there were three people, two households, and one family residing in the unorganized territory.
The population density was 0.1 people per square mile (0/km2).
There were thirteen housing units at an average density of 0.4 per square mile (0.15/km2).