Seaton is a village in Mercer County, Illinois, United States.

According to the U.S. Census Bureau, Seaton has a total area of 1.58 square miles (4.09 km2), all land.

There were 94 housing units at an average density of 59.9 per square mile (23.1/km2).

15.9% of all households were made up of individuals, and 6.8% had someone living alone who was 65 years of age or older.

About 4.1% of families and 2.7% of the population were below the poverty line, including none of those under the age of eighteen and 10.7% of those 65 or over.