Eidson is an unincorporated community located on Clinch Mountain in Hawkins County, Tennessee, United States. It is part of the Kingsport–Bristol (TN)–Bristol (VA) 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 community is the site of the Clinch School, a K-12 public school operated by Hawkins County. Clinch School is the smallest K-12 school in the state, with a 2006-2007 enrollment of 133 students. The main school building was constructed in 1938 as a Works Progress Administration project to provide a high school for the Eidson community. Before the high school was built, Clinch School ended at grade 10, and students wishing to continue their education past that level attended Rogersville High School, Grainger County High School, or Hancock County High School. A new Clinch School is under construction as of autumn 2009. Eidson is also the site of a post office, assigned the zip code 37731. The town was named after a group of families living there with the surname Eidson. Among them was Andrew Jackson Eidson, a patriarch of the branch of Eidsons found throughout East Tennessee. Many Eidson are concentrated around upper Hawkins County.