Mattson, MississippiMattson, also known as Earnest, is an unincorporated community located near U.S. Route 49 in Coahoma County, Mississippi, United States.Mattson is south of Clarksdale and north of Dublin.HistoryMattson is named after a local family that owned a large sawmill in the area. Mattson is located at a junction of the former Yazoo and Mississippi Valley Railroad. A post office operated under the name Earnest from 1887 to 1897 and first began operation under the name Mattson in 1897. A drug store operated by T. R. Montgomery formerly operated in Mattson.Notable people Big George Brock, blues harmonica player Clayton Love, blues pianist, bandleader, singer