Selmer is a city in McNairy County, Tennessee, in the southwestern part of the state. The population was 4,396 at the 2010 census and estimated at 4,400 at the 2018 census. It is named after Selma, Alabama. It is the county seat of McNairy County, Tennessee Buford Pusser served as the sheriff of McNairy County from 1964 to 1970.