The party secured a crushing 32.2 per cent of the vote, which the Ipsos poll projected would give En Marche between 390 and 430 of the 577 seats in France's lower house.
If the seat projections are confirmed next week, he will have a strong mandate to push through the ambitious labour, economic and social reforms he promised on the campaign trail.
That scenario appears likely with the President enjoying a successful first few weeks in office where he has impressed in his attitude toward US President Donald Trump and Russian President Vladimir Putin. Polls project it could win about a dozen seats, in part because of a voting system that favors the biggest parties.
The head of the conservative Republicans party, Francois Baroin, also urged voters to turn out in larger numbers next week to help ensure that Macron's party faces a robust opposition.
He has drawn candidates from a cross-section of society with a former bullfighter, a Nobel Prize victor and a an ex-fighter pilot all hoping to win a seat.
French President Emmanuel Macron's En Marche took almost a third of the vote in the first round of parliamentary elections, exit polls indicated.
The two mainstream parties on the left and right that dominated French politics for decades were again left licking their wounds, marginalized by the swing of voter support behind Macron's political revolution.
Top Aides to UK PM Quit After Election Losses
Theresa May also forced her two closest aides to quit on Saturday after they have taken the blame for the election campaign. May said Barwell would help her "reflect on the election and why it did not deliver the result I hoped for".
Marine Le Pen's FN party was left disappointed as she struggles to rebound from her bruising defeat by Macron in the presidential run-off, with the party's result largely unchanged from the first round of the 2012 vote. "It is neither healthy nor desirable for a president who gathered only 24 percent of the vote in the first round of the presidentials and who was elected in the second round only by the rejection of the extreme right should benefit from a monopoly of national representation", said Socialist party leader Jean-Christophe Cambadelis.
His party is projected to win well beyond an absolute majority in the 577-seat National Assembly, followed by the conservative Republicans.
"For the past month, the president has shown confidence, willingness and daring in France and on the global stage", Philippe said, calling the result a vindication of Macron's "winning strategy".
Both the Republican and Socialist parties, which have traditionally governed during the time of the Fifth Republic, struggled with turnout, which was projected at 49.5% by Elabe.
Turnout was low across the country, with data from polling organisations indicating less than 50 per cent of the population would cast their ballot.
The party's secretary general, Nicolas Bay, warned of Macron getting "a majority so big that he will have a sort of blank check for the next five years".
Voter rejection of old-style, established politics - already seen in the April-May two-round presidential vote that handed power to 39-year-old Macron - was again manifest in the legislative vote. The legislative elections don't concern the Senate, which is now run by a conservative majority.
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