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The seasonally-adjusted Live Register figure rose by 900 to 423,400 in November, having fallen in October for the first time since March 2007.
The headline figure, which does not take seasonal factors into account, showed an increase of just over 1,000 to 413,505.
The unemployment rate was unchanged from October at 12.5%.
Labour Party leader Eamon Gilmore told the Dáil this morning during Leaders' Questions that the figure for November this year is the highest November figure ever.
He said the Taoiseach had tried to put a gloss on the figure. Brian Cowen denied any misrepresentation.
