She won a fifth of the vote in the first round of the presidential election in April, coming second behind Macron by just a few percentage points of the vote, yet pollsters expect she will have just a handful of seats in parliament in contrast to 400 or more for Macron.
Emmanuel Macron's centrist La Republique En Marche is projected to win a huge majority in the French Parliament, according to exit estimates compiled for CNN affiliate BFMTV by Elabe. That's being blamed on voter fatigue, after a long and divisive presidential campaign that saw Macron elected last month.
Among commentators also sounding a cautionary note was Nicolas Beytout of the daily L'Opinion, who wrote: "Sure, Emmanuel Macron is ready to pull off the unthinkable for someone who didn't even have a party a year ago - a spectacular majority in the National Assembly".
Under France's electoral rules, only candidates who win more than 50 percent of votes in the first round win the seat outright.
A comprehensive victory for Macron's party is largely seen as a market-friendly event, although the CAC 40 index was down nearly 1% on Monday at midday.
The far-right National Front party secured 13.1 percent, and the Socialist Party and a grouping of left-wing parties only managed nine percent. Le Pen, who had Europe on edge until she lost the May 7 presidential race, was trying to save herself and her party in the legislative contests.
They include tech entrepreneur Bruno Bonnell, who campaigned by sticking photos of him and Mr Macron on the side of a rented van in Villeurbanne, eastern France.
"We want a big majority to be able to act and transform France over the next five years", Mounir Mahjoubi, a tech entrepreneur running under Macron's Republic On The Move (LREM) banner told Reuters as he canvassed support in his northern Paris constituency ahead of the vote.
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French voters have traditionally rallied behind their new leader in the legislative elections that follow the presidential ballot.
Projections show his Republic on the Move party and its MoDem ally set to win up to 445 seats.
The far-right formation had been hoping to pick up at least 15 MP seats so that it can be allowed to form a parliamentary group of their own, and is now projected to win only somewhere from one to five seats in the French National Assembly.
Former Republicans party leader Jean-Francois Cope said the results were "a disaster".
If no candidate manages to achieve that target, then all candidates who won at least 12.5% of registered voters go to the second round, where the victor will advance to Parliament.
With all the ballots counted, Macron's LREM and MoDem won 32.3 per cent of the vote, according to BBC report.
Ifop pollster Frederic Dabi said a virtual monopoly on power would up the ante for Macron.
The party's election chief, Francois Baroin, appealed to middle-class voters and rural voters to choose his party in the second round, saying it would safeguard them against tax rises or cuts to public services in the countryside.
While Macron's party is confident, the more traditional parties are expected to struggle.