France's far-right National Front leads in regional elections
If confirmed, the result would be a boost for Le Pen, who had hoped her anti-immigrant, anti-euro party would emerge top in the first round, boosting her hopes for 2017 presidential elections.
There will be a run-off on Dec.13.
The National Front secured 30.6 percent of the vote nationally, an exit poll by Ifop-Fiducial poll showed, ahead of former president Nicolas Sarkozy's conservative Les Republicains party and their allies, who secured 27 percent.
As expected, President Francois Hollande's ruling Socialists came third polling 22.7 percent.
(Reporting By Ingrid Melander and John Irish)