Sumner is a town in Tallahatchie County, Mississippi. The population was 407 at the 2000 census. Sumner is one of the two county seats of Tallahatchie County. It is located on the west side of the county and the Tallahatchie River, which runs through the county north-south. The other county seat is Charleston, located east of the river. Charleston was the first county seat, as settlement came from the east, and it is the larger of the two towns.
The Tallahatchie County Courthouse in Sumner was the site in 1955 of the trial of two men charged with the lynching murder in August of Emmett Till, a 14-year-old African-American boy from Chicago who was visiting his great-uncle in Money, Mississippi. The all-white jury acquitted the men; a few months later, they sold their story to Look and admitted killing Till. The courthouse has been restored and also houses the Emmett Till Interpretive Center which opened in 2012.