McNairy County is located in the southwestern part of Tennessee, bordered by the Tennessee River to the west. Established in 1820, it is named after John McNairy, a prominent early settler and politician. The county seat is Selmer, which serves as the administrative center and is known for its rich history and community events. The county features a mix of rural landscapes, including forests and farmland, making it ideal for outdoor activities. McNairy County is also home to several historical sites, such as the McNairy County Museum, which showcases local heritage and culture.