Preemption Township is located in Mercer County, Illinois.

As of the 2010 census, its population was 1,783 and it contained 737 housing units.

[2] Preemption Township changed its name from Fairfield Township sometime before 1921.

According to the 2010 census, the township has a total area of 36.88 square miles (95.5 km2), of which 36.85 square miles (95.4 km2) (or 99.92%) is land and 0.03 square miles (0.078 km2) (or 0.08%) is water.

This Mercer County, Illinois location article is a stub.