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became the new Province of Trieste and Zone B was to be administered by Yugoslavia. The Province of Trieste formally became a part of Italy on 11 October 1977, by the Treaty of Osimo.

The province was abolished on 30 September 2017. Two years later, it was restored in the form of a regional decentralization entity.

Municipalities

The province has 6 municipalities (comuni).

Demographics

As of 2026, the population is 227,840, of

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