Bloomingdale is a census-designated place in Sullivan County, Tennessee. The population was 8,918 at the 2020 census down from 9,888 at the 2010 census, due to annexation by the City of Kingsport. It is part of the Kingsport-Bristol-Bristol, TN-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.