Like the rest of France, the second round was initially suspended due to the COVID-19 pandemic.

On 22 May, Prime Minister Édouard Philippe announced that the second round of voting would take place on the 28th of June.

In 2020, only 32 communes in Allier had a second round of elections, with the majority being decided with a single round absolute majority.

[1] Aside from Bourbon-l'Archambault, candidates on the left were not able to recover communes lost in the previous elections, such as in Bellerive-sur-Allier, Cosne-d'Allier, Cusset, Gannat, Varennes-sur-Allier, and Vendat.

The right easily retained its position in the four largest communes of the department, despite a perilous four-way second round in Montluçon.