Eureka Mill is a census-designated place (CDP) in Chester County, South Carolina, United States.

Eureka Mill is an unincorporated suburban area on the northeastern side of the city of Chester, the county seat.

South Carolina Highway 9 forms the southern boundary of the CDP, leading eastward out from the center of Chester.

According to the United States Census Bureau, the Eureka Mill CDP has a total area of 1.29 square miles (3.34 km2), all of it land.

26.3% of all households were made up of individuals, and 11.4% had someone living alone who was 65 years of age or older.