The Bristol Virginia Population Continues To Decline. That According To The Latest U.S. Census Bureau’s Most Recent Estimates. The July 2017 Population Estimate For The City Was 16, 790. That Figure Was 0.8 Percent Lower That The Year Before, A Drop That Also Represents The Average Annual Decline For The City’s Population Since 2010. Meanwhile, The Populations Of Washington County, Virginia, And Sullivan County Tennessee Have Barely Budged Over The Last Few Years.