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The total number of constituencies has varied since 1958 but since the 1986 electoral reform re-establishing the two-round system for legislative elections, the total number of constituencies is 577. The last electoral boundaries readjustment dates back to 2010.
Out of the 577 existing constituencies, there are:
11 constituencies for French people living abroad.
Moreover, the French Constitution sets the maximum number of MPs at 577.
Timing
MPs are elected for a five-year-term.
Following the reduction of the presidential term's length from 7 to 5 years after the 2000 referendum, a 2001 organic law has set the expiration of the outgoing National Assembly's powers on the third Tuesday of June of the fifth year following the last general election. The government sets the election dates by decree.
Legislative elections need to be held during the 60-day period preceding the expiration of the outgoing Assembly's powers. Therefore, legislative elections are usually held in June, some weeks after the presidential election. Until the electoral calendar reform of 2001, legislative elections, apart from early elections, were usually held in March.
Besides, per the French Constitution (article 12), the President has the power to dissolve the National Assembly after consulting with the Prime minister and the heads of the lower and upper houses of Parliament. The Constitution does not set limits on that power apart from prohibiting another dissolution from occurring less than a year after the last one. General elections have to be held necessarily from 20 to 40 days after the Assembly has been formally dissolved.
Along with the establishment of the Fifth Republic, the two-round system (TRS) was established as the country's voting system for legislative/general elections in 1958.
MPs are elected in single-member constituencies. A candidate who receives an absolute majority of valid votes and a vote total greater than 25% of the registered electorate is elected in the first round. If no candidate reaches this threshold, a runoff election is held between the top two candidates plus any other candidate who received a vote total greater than 12.5% of registered voters. The candidate who receives the most votes in the second round is elected.
Since then, every legislative election, apart from the 1986 list-PR election, used TRS.
Coty was the last President of the Fourth Republic. Nonetheless, thanks to transitory constitutional provisions, he remained in office until handing over to his successor in January 1959.
Although neither Ensemble or LR won the election per say since RN won the popular vote and the NFP won the most seats, Ensemble and LR subsequently formed a government thanks to a coalition deal giving them the largest combined number of seats in the Assembly.
That figure reflects the combined share of the popular vote for Ensemble, LR, miscellaneous right and centre candidates who ran on separate platforms in the election before entering a coalition agreement to form the next government.
