As of July 2025, there have been 55 referendums on the question of changing executive arrangements to a model with a directly elected mayor. Of these, 17 have resulted in the establishment of a new mayoralty and 37 have been rejected by voters. Referendums can be triggered by council resolution, local petition or central government intervention.
"Yes" majority shown in green, "No" majority shown in red.
There have been nine referendums on the question of removing the post of elected mayor. Four mayoral posts have been disestablished following a vote and five retained.
"Retain" majority shown in green, "Remove" majority shown in red.