Hearn's Pond was created in 1816, when Nathaniel Ross established a grist mill on Clear Brook Branch at this location. Known by various names, notably those of early owners William Cannon and William Ross, the mill was destroyed by fire in 1879. It became known as Hearn's Mill when Marcellus Hearn bought the property in 1885, and the Corn Stone from the original mill was saved from the fire and installed in the new mill erected in its place. Hearn later installed rollers for grinding grain to replace the traditional wheel turned stones, making the mill more efficient for flour production. Following his death in 1916, George H. Hearn and Mary Rawlins, his son and daughter, took over the mill. Hearn and Rollins Flour Mill remained in the possession of family members until 1999, when it was purchased by the United Nation of Islam. The mill structure was added to the National Register of Historic Places in 1978, and Hearn's Pond is now the property of the State of Delaware.