New State Data Shows Unemployment Rates Fell In 94 Of Tennessee’s 95 Counties In April. According To The Tennessee Department Of Labor And Workforce Development, Only Unicoi County Saw An Increase, Rising To 4.9 Percent. Johnson County Reported The Highest Rate In The State At 5.1 Percent, While Williamson County Had The Lowest At 2.2. The Statewide Unemployment Rate In April Was 3.5 Percent, Compared To 4.2 Percent Nationally.