The major streets are the following: Via Roma, Via Carracchia Di Sopra, Corso Umberto I.
In term of town halls you can find 1 places (like "Municipio di Castronovo di Sicilia"). For post offices you have 1 places with "Castronuovo di Sicilia" for example.
Are you looking for an apartment for sale/rent? Or interested by a house? You can check that on Subito.
Closest cities