From the Wikipedia page [1]

The Central Archives of the State (in Italian: Archivio centrale dello Stato) are the main national archives of Italy. They were created in 1875 under the name of Royal Archives. They took their present name in 1953. They are located in Rome and are put under the responsibility of the Ministry of Culture.

However, each of the 103 Italian provinces has its own state archive, keeping the public documents created in that territory and, mainly, the state archives of the Italian historical states.

There is more information on the Italian Wikipedia page [2], and the Archives' website, in Italian, is [3]

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