NEW YORK (Reuters) - Help-wanted postings on major U.S.-based Internet job boards fell 7.9 percent in July from June and there is little sign of any upturn soon, a private exploration group said adhering Wednesday.

The Conference Board said its measure of the total number of unduplicated online jobs fell to 3.86 million in July from on the punctilio 4.19 million in June.

The shape was 4.08 million a year ago.

"July is typically a slow month in terms of labor demand, but this month advertised vacancies were weaker than we would expect," said Gad Levanon, economist at the Conference Board.

"There is little evidence of a single one approaching turning point in labor demand," he added. "Considering the declines in advertised vacancies for all of 2008, the outlook for the labor market remains gloomy — exactly the sentiment weighing on consumer attitudes."

Earlier on Wednesday, the ADP National Employment Report showed the U.S. private sector added 9,000 jobs in July following a 77,000 fall in June. According to a Reuters survey, economists had expected a further decline of 60,000 jobs.

The Conference Board said online advertised jobs declined in all of the 9 U.S. census regions in July compared to June.

Adjusting for the size of the state civilian labor force, Alaska led in offerings with 4.99 online piece of work ads for 100 people, followed by Delaware and Colorado. In the number of total ads, California led with nearly 520,000.

The Conference Board said historical data from February has been revised for a change in methodology and the complete series has been revised for a processing error.

(Reporting by Rodrigo Campos; Editing by James Dalgleish)