(ADP article updated with additional information.)NEW YORK ( TheStreet) -- Private sector job growth accelerated significantly in December, led by the service sector, encouraging hopes that businesses may be finally hiring again. On a seasonally adjusted basis, companies added 297,000 jobs in December, according to the latest ADP National Employment Report. That was significantly higher than expectations, with economists forecasting private sector jobs to rise by 100,000, according to Briefing.com. The report revised the November's estimate to 92,000 from 93,000. Hiring picked up across most industries, with the services sector adding 270,000 in December, the largest monthly increase in the report's history. The goods-producing sector rose 27,000, its second consecutive monthly gain and the most since February 2006. Manufacturing employment also rose by 23,000.