Forest City is a village in Mason County, Illinois, United States.

According to the U.S. Census Bureau, Forest City has a total area of 0.52 square miles (1.35 km2), all land.

[1] Sand Ridge State Forest occupies hilly country to the northwest.

The racial makeup of the village was 98.61% White, 1.05% Native American, and 0.35% from two or more races.

About 4.3% of families and 8.0% of the population were below the poverty line, including 8.6% of those under the age of eighteen and none of those 65 or over.