Post Offices in Kingsport, Tennessee, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Colonial Heights Post Office No Reviews Favorite Phone: (423) 239-0900Retail Hours Downtown Kingsport Post Office No Reviews Favorite Fax: (423) 245-0500Phone: (423) 245-0500Retail Hours Kingsport Post Office No Reviews Favorite Fax: (423) 246-1600Phone: (423) 230-6306Retail Hours