Preemption is an unincorporated community and census-designated place in Preemption Township, Mercer County, Illinois, United States. As of the 2020 census, it had a population of 254. Preemption is west of Sherrard.
Roy James Carver (1909-1981), American philanthropist and businessman, was born in Preemption.
Preemption first appeared as a census designated place in the 2020 U.S. census.