Purdy, Tennessee is a rural unincorporated community 3.5 mi northeast of Selmer in McNairy County, Tennessee. Until 1890, Purdy was the county seat of McNairy County. Failed development in the 1850s kept the community rural thereafter, without industries, major business ventures or tourism. During the Civil War the town was a crossroads, but during t…Purdy, Tennessee is a rural unincorporated community 3.5 mi northeast of Selmer in McNairy County, Tennessee. Until 1890, Purdy was the county seat of McNairy County. Failed development in the 1850s kept the community rural thereafter, without industries, major business ventures or tourism. During the Civil War the town was a crossroads, but during the war damage was done to the town which led to its decline.