A so-called super-majority for Macron's party will nearly certainly be well received by the markets as it will give Macron the mandate to deliver his Presidential election promises to loosen France's employment laws, overhaul its social security system and recommit to the European Union.
Key rivals say they expect La REM to win a majority and have been urging voters to make the margin as small as possible, saying that otherwise democratic debate could be stifled.
The election also spells trouble for Marine Le Pen's far-right National Front (FN), seen with only between one and six seats when earlier it had hoped to secure a "massive" presence in parliament.
FILE - In this Sunday, June 11, 2017 file photo, the president of La République En Marche party Catherine Barbaroux, delivers her speech at her Party headquarter in Paris, France.
French voters went to the polls on Sunday for parliamentary elections set to hand a landslide victory to the centrist party of President Emmanuel Macron which would complete his stunning reset of national politics.
The conservative The Republicans are expected to be the biggest opposition group in parliament.
Pollsters predict the party faces financial ruin with its strength in parliament falling from almost 300 seats to around 20 after their five years in power under president Francois Hollande.
5 potential destinations for Cristiano Ronaldo
On his return, they say Ronaldo is ready to leave Real Madrid after leading them to back-to-back Champions League titles. Cristiano Ronaldo was the last player to score 40+ goals (all comps) in a single season for a PL club (42 in 2007-08).
The Socialist Party, which ruled France until last month, and its allies are projected to win 20 to 30 seats less than its current 277. "We're going to find ourselves with fewer opposition representatives than there are in Russian Federation".
After a strong showing in the first round, Macron's La Republique En Marche party, is expected to win more than 400 seats in the lower house when the Sunday's second round of voting concludes.
The party of Melenchon, a candidate in a Marseille district facing off a Macron candidate, was also hit hard by the low turnout rate.
If confirmed, the victory will come at the expense of France's traditional parties, the rightwing Republicans and Socialists, but also the far-right National Front which faces major disappointment.
Speaking at a joint press conference after talking to visiting British Prime Minister Theresa May in the Elysee Palace, Macron said the two countries were determined to strengthen their counterterrorism cooperation and announced his country and Britain will jointly launch an action plan to tackle online terrorist threat and radicalization.