The unemployment rate in Montgomery County declined to an unadjusted 4.1 percent in December from 4.9 percent a year earlier, according to a state labor department report.

Montgomery’s jobless level was the lowest for December since it was 3.9 percent in 2008.

Frederick County’s rate also hit its lowest December mark since 2008 at 4.8 percent, down from 5.5 percent a year earlier. The state’s unadjusted rate in December was 5.7 percent, a drop from 6.7 percent a year earlier.

Montgomery and Frederick counties gained some 14,000 jobs last year, the most since almost 15,000 in 2000, according to federal labor department figures. The 2.5 percent gain was better than the Baltimore area and other regions in Maryland.

Professional and technical positions gained 6 percent in Montgomery-Frederick in the past year, while jobs at hotels and restaurants increased 3 percent. Employment at department stores dropped about 6 percent, while manufacturing jobs declined 4 percent.

Montgomery County itself has added more than 18,000 jobs since 2011, County Executive Isiah Leggett (D) said in a statement. “By putting our fiscal house in order and investing in the jobs of the future, we are coming out of the worst of the economic crisis stronger than ever,” he said.