Cornersville is a small town in Marshall County, Tennessee. Prior to its incorporation in 1830, the town was known as Marathon, as its distance to Pulaski was equal to a marathon. Its current name refers to its location near the corner where the counties of Giles, Maury, Bedford and Lincoln come together. At the time of its incorporation, it was part of Giles County, but boundaries changed in 1870, placing it in Marshall County.