ATLANTA — The Georgia Department of Labor announced Thursday that Metro Hinesville’s unemployment rate for March was 5.9 percent, down 0.1 percentage point from February. The rate in March 2015 was 6.3 percent. The rate declined as the number of employed residents increased by 208 to 30,375, and the number of initial claims for unemployment insurance declined by 15, or 10.1 percent, to 134.