Earlier, final results of Sunday's elections published by the Interior Ministry showed Macron's La Republique en Marche (The Republic on the Move, LREM) and allies taking 350 seats in the 577-member National Assembly. It is humiliating the Socialist and conservative parties that alternated in power for decades until Macron's election in May. The party's leader, Jean-Christophe Cambadelis, immediately stood down.
But Le Pen was comfortably beaten by now-President Emmanuel Macron.
His year-old party then filled the political space created by the disarray within the Socialist Party and the Republicans, with Sunday night capping a sequence of events that a year ago looked improbable.
Marine Le Pen has said that whilst Macron may have won a large parliamentary majority, "he must know that his ideas are not of the majority in the country and that the French will not support a project that weakens our nation".
France's political mood remains volatile and one indicator of remaining voter unease is the exceptionally low turnout in the legislative elections estimated at 43%.
"So Macron has a majority and once again, coming from out of nowhere, he achieved a remarkable result".
Le Pen had been criticized for failing to capitalize on the 10.6m votes she won when she came second in the presidential election last month.
Macron, a political neophyte who has never held political office and only briefly served as minister of the economy in the Cabinet of his predecessor, Francois Hollande, has nevertheless proved a compelling figure on the campaign trail with both great timing and an unerring ability to read the public mood.
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"En Marche.proactively made a decision to give winning seats to women", said 34-year-old Brune Poirson, who beat the FN to be elected to parliament in the Vaucluse district in southeastern France.
"The level of abstention in the second round is a sign that a large part of the working-class electorate are not going to vote anymore", Luc Rouban, a professor at the Center for the Study of French Political Life at Sciences Po, told The New York Times.
Expectations could not be higher for French President Emmanuel Macron and his centrist Republic on the Move party. With the June 27 start of the new session, the novices within the ranks of Macron's Republic on the Move! party will be learning at high-speed.
Around half of the candidates for Macron's new centrist party are virtual unknowns drawn from diverse fields of academia, business or local activism.
Macron further burnished his diplomacy credentials on Monday by hosting Jordan's King Abdullah, saying fighting terrorism and radicalisation topped their agenda along with the crisis in Syria.
Le Pen on Monday praised Sunday's vote as "historic" result but denounced an "anti-democratic voting system" that she says doesn't represent the "real weight" of her party in the country. Unlike the National Front, Melenchon and his allies will have the required 15 lawmakers needed to form a group, a tool that provides extra funds, speaking time and other ways to weigh on policy.
The former picked up only 46 seats - down from 295 in the 2012 elections - while the centre-right party and their coalition partners finished with 126.