Short answers, pulled from the story.
The Free Territory of Trieste occupied a narrow strip of land around the Gulf of Trieste in the northern Adriatic Sea. It stretched from Duino in the north to Cittanova in the south, covering an area of approximately 386 square kilometers.
A permanent statute became recognized under international law on the 15th of September 1947 when the peace treaty established the Free Territory of Trieste. The United Nations Security Council had approved Resolution 16 in January 1947 calling for this free state.
Zone A covered about 222 square kilometers with a population of 262,406 including Trieste itself, administered by British and American forces. Zone B spanned approximately 164 square kilometers with 71,000 residents, controlled by the Yugoslav army.
On the 5th of October 1954, the London Memorandum was signed by ministers from the United States, United Kingdom, Italy, and Yugoslavia which dissolved the territory de facto. After withdrawal of Allied military troops by the 24th of October 1954, Italy assumed civil administration of Zone A on the 26th of October 1954.
Official languages included Italian and Slovene, with possible use of Serbo-Croatian south of the Dragonja River. The local Triestine dialect reflected this mix, based on Romance Venetian language with influences from ancient Rhaeto-Romance substrate.