Limestone is an unincorporated community on the western border of Washington County and the eastern border of Greene County in the northeastern part of the U.S. state of Tennessee. Its zip code is 37681. The Washington County portion of Limestone is part of the Johnson City Metropolitan Statistical Area, which is a component of the Johnson City–Kingsport–Bristol, TN-VA Combined Statistical Area – commonly known as the "Tri-Cities" region. The Greene County portion of the community is part of the Greenville Micropolitan Statistical Area. Washington College Academy was founded in Limestone in 1780 by Rev. Samuel Doak, and was the first institution to bear the name of the first American president. Limestone was the birthplace of Davy Crockett (1786) and is the location of the Davy Crockett Birthplace State Park. The Gillespie House, built in 1792 by pioneer settler George Gillespie, still stands in Limestone. One of the locations used in the TV movie Goodbye, Miss 4th of July (1988) was the Old Stone House in Limestone.