In December 2007, Idaho and South Dakota posted the lowest jobless rates among the States, 3.0 percent each.
Overall, 17 states registered unemployment rates in December that were significantly below the U.S. rate of 5.0 percent, 8 states and the District of Columbia recorded measurably higher rates, and 25 states had rates that were statistically little different from that of the nation.
These data come from the BLS Local Area Unemployment Statistics program and are seasonally adjusted. More State unemployment statistics are available in "Regional and State Employment and Unemployment: December 2007" (PDF) (HTML), news release USDL 08-0067.
Bureau of Labor Statistics, U.S. Department of Labor, The Economics Daily, States with lowest unemployment rates in December 2007 at https://www.bls.gov/opub/ted/2008/jan/wk3/art01.htm (visited August 18, 2022).