<page_title> 2018 Val-d'Oise's 1st constituency by-election </page_title> <section_title> 2018 by-election result </section_title> <table> <cell> Isabelle Muller-Quoy <col_header> Candidate </col_header> <col_header> % </col_header> </cell> <cell> 48.55 <col_header> Second round </col_header> </cell> <cell> Antoine Savignat <col_header> Candidate </col_header> <col_header> % </col_header> </cell> <cell> 51.45 <col_header> Second round </col_header> </cell> </table>
In the second round, Savignat was elected with 51.45% of the vote by defeating Muller-Quoy, who received 48.55%.