Knox County's unemployment rate rose two-tenths of a percentage point in April, but it still remains the lowest among Tennessee's metropolitan counties. The Tennessee Department of Labor and Workforce Development reports a rate of 6.4% in Knox County, up from March's rate of 6.2%. When compared with other Tennessee counties, Knox County has the fourth-lowest unemployment rate in the state. Williamson County in Middle Tennessee has the lowest. Despite a drop of more than one full percentage point in the last month, Scott County still has the state's highest unemployment rate at 16.1%. Tennessee's unemployment rate was 8.0% in April, up from 7.8% in March. The national rate was 7.5%.