About 4,813,400 online job postings appeared on leading Internet job boards in September, an increase of 128,600 from August, the Conference Board reported Wednesday.

"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."

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