The differing colours on this map show the percentage of support for the introduction of a republic in the 31 constituencies at the Italian referendum of 1946. A total of 54.3 % of the voters backed the new form of government and with it the abolition of the monarchy. Regionally, there were clear differences in the voting behaviour. South Tyrol (apart from a few municipalities) and the areas of Trieste and Gorizia didn't take part in the referendum.
derivative work based on:

File:Italy map with provinces.svg by Helix84
File:Map of Italy Constituencies Chamber of Deputies Old.png by Lochness
Franco Malnati: La grande frode. Come l'Italia fu fatta Repubblica. Bastogi Collana De Monarchica, Bari, 1998, p. 234
Mai-Sachme