Rosemont is an unincorporated community in Mahoning County, in the U.S. state of Ohio. [1]
A post office called Rosemont was established in 1888, and remained in operation until 1928. [2] Besides the post office, Rosemont had a country store, operated by D. L. Rose. [3] Early industries at Rosemont included two mills and two coal mines. [4]