 Johnson City is the principal city of the Johnson City Metropolitan Statistical Area, which covers Carter, Unicoi, and Washington counties and had a combined population of 200,966 as of 2013.The MSA is also a component of the Johnson City–Kingsport–Bristol, Tennessee–Virginia Combined Statistical Area – commonly known as the "Tri-Cities" region.This CSA is the fifth-largest in Tennessee with an estimated 500,538 people in residence.