[1] In Trentino-Alto Adige the elections were held on 8 May (second round on 22 May),[2] in Aosta Valley on 15 May.
[3] Municipal councilors and mayors ordinarily serve a term of five years.
All mayoral elections in Italy in cities with a population higher than 15,000 use the same system.
The coalition of the elected mayor is guaranteed a majority of seats in the council with the attribution of extra seats, but the majority bonus system is not adopted by the cities of Trentino-Alto Adige.
Majority of each coalition in 149 municipalities (comuni) with a population higher than 15,000: Notes: almost all political parties and coalitions in local (municipal and regional) elections usually run with the support of some minor allied list active in local politics forming coalitions under the same nominee as the mayoral candidate, only M5S ran in all elections with a single list (that is the M5S list with its mayoral candidate without forming coalitions with minor local lists or other national parties).