The number of jobs advertised online in the United States increased by 128,600 in September to approximately 4.8 million, according to a report released today by The Conference Board. The increase follows a loss of 262,300 in July and August.

The average monthly gain in 2012 is 55,000 with a sharp gain in sales occupations in September. Following a strong increase of 625,000 in the first half of 2012, the third quarter finished down 134,000.

“The September rise was welcome news, especially the strong gain for sales staff and managers, which made up almost one third of the increase,” said June Shelp, vice president at The Conference Board. “Occupations commonly associated with building (Construction and Building and Grounds Maintenance) also rose a combined 8,900 in September as employers had to replace or add workers. In 2012, the average monthly increase has been 55,000 and 48 of the 50 states (all but Vermont and Wyoming) are showing gains.”