Projections showed Macron continuing his centrist revolution, with his Republique en Marche (Republic on the Move, REM) party and its ally MoDem tipped to win between 400 and 445 seats in the 577-member National Assembly in next Sunday's second round.
Such a share would give Macron -- who founded his party just a year ago -- one of the biggest parliamentary majorities the modern French state has seen.
But government spokesman Christophe Castaner admitted the 49 per cent turnout -- the lowest for six decades in such a vote -- was "a failure of this election" and that Macron's team would need to reach out to those who stayed away.
Former prime minister Alain Juppe of the rightwing Republicans said the mass stayaway by voters was a sign of "deep malaise" in the electorate and that a clean sweep by Macron would be bad for democracy.
"The stakes of the second round are clear," said the Bordeaux mayor, calling for Republicans voters to turn out in force on Sunday. "Having a monochrome parliament is never good for democratic debate."
Only four MPs -- two of them from Macron's slate -- topped the 50 per cent mark needed for election at the first round.
Official final results showed his year-old REM and allies MoDem winning 32.32 per cent, ahead of the right-wing Republicans and its allies on 21.56 per cent and the far-right National Front (FN) of Marine Le Pen on 13.20 per cent.
The Socialists and their allies secured just 9.51 per cent while the radical left and communists were on 13.74 per cent.
They include Marie Sara, a retired bullfighter, who is running neck-and-neck with FN stalwart Gilbert Collard in southern France, and star mathematician Cedric Villani running for office in the southern Paris suburb of Essonne.
The Republicans -- who had hoped to rebound from their humiliation in the presidential vote -- are shown trailing in second with a predicted 70-130 seats.
The FN, which has long complained that France's winner- takes-all system discriminates against small parties, is meanwhile forecast to garner only between one and 10 seats.
The FN's deputy leader Florian Philippot admitted to "disappointment" and called on FN voters to turn out in force for the second round.
The radical France Insoumise (France Unbowed) of leftist firebrand Jean-Luc Melenchon and on-off Communist allies fell short of expectations.
The worst losses, however, were for the Socialists of Macron's deeply unpopular predecessor Francois Hollande, who are predicted to lose around 200 seats -- a historic rout that has thrown the party's future into question.
Party leader Jean-Christophe Cambadelis and failed presidential candidate Benoit Hamon both crashed out of the running on Sunday.
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