French new-car sales rose 7 percent to 211,254 in March, helped by an extra selling day, industry association CCFA said on Monday.
Taking into account the extra selling day, growth was 2.4 percent.
Toyota's gain was the biggest among major brands with volume rising 34 percent, while Fiat Chrysler Automobiles' sales jumped 18 percent, helped by an 18 percent increase in Fiat brand sales.
Sales at General Motors' Opel brand rose 8.1 percent.
Volkswagen Group's volume slipped 3 percent, as sales of the core VW brand's cars fell 8.7 percent and Seat's volume slipped 3.3 percent. Audi registrations were up 6.6 percent, while Skoda sales jumped 5.7 percent and Porsche volume rose 8 percent.
Renault Group sales rose by 5.3 percent with Renault brand sales up 4.3 percent and volume at its budget Dacia unit increasing by 9.5 percent.
PSA Group's sales increased 8.5 percent with Peugeot sales up 12 percent and Citroen's volume gaining 8.9 percent. Registrations of DS cars fell 34 percent.
Kia sales were up 18 percent, while volume at affiliate Hyundai rose 14 percent.
• Download PDF, above right, for March sales by automaker and brand.
Through March, sales rose 4.8 percent to 541,065, the CCFA said.
Analysts Evercore ISI forecast that the French market will grow 2 percent this year.
Reuters contributed to this report