. "1.0"^^ . . "145.561"^^ . . "122979"^^ . "Washington County is a county located in the U.S. state of Tennessee. As of the 2010 census, the population was 122,979. Its county seat is Jonesborough. The county's largest city and a regional educational, medical and commercial center is Johnson City."@en . "2010Z"^^ . "1777Z"^^ . "Washington County"@en . "8.44336e+08"^^ . . "8.54696e+06"^^ . "8.54696e+08"^^ . . .