NASHVILLE – Cannon County's unemployment rate for May dropped considerably from the previous month. The rate fell from 9.6 percent in April to 8.4 percent in May, a decline of 1.2 percentage points. Tennessee’s unemployment rate for May was 10.4 percent, down one-tenth of a percentage point from the April rate of 10.5 percent. The national unemployment rate for May 2010 was 9.7 percent. County non-seasonally adjusted unemployment rates for May 2010, released today, show that the rate decreased in 86 counties, increased in seven counties and remained the same in two counties. Lincoln County registered the state's lowest county unemployment rate at 6.6 percent, down from 7.1 percent in April. Scott County had the state’s highest unemployment rate at 19.8 percent, down from 20.2 percent in April, followed by Marshall County at 16.7 percent, down from 17.3 percent in April. Knox County had the state’s lowest major metropolitan rate of 7.7 percent, down from 8.2 percent in April. Davidson County was 8.9 percent, unchanged from the April rate. Hamilton County was at 8.6 percent, down from 9.0 in April, and Shelby County was 10.0 percent, down from 10.2 in April.