Santadi is a town and comune (municipality) in the Province of Sulcis Iglesiente in the autonomous island region of Sardinia in Italy, located about southwest of Cagliari and about southeast of Carbonia. It has 3,029 inhabitants.
Santadi borders the municipalities of Assemini, Domus de Maria, Nuxis, Piscinas, Pula, Teulada, Villa San Pietro, and Villaperuccio.
Starting from a hill next to the small town of Santadi, it is possible to see how the urban development system develops in concentric circles. This fact gave rise to the hypothesis that Santadi is what remains of the capital of the island mentioned by Plato in the third chapter of the Timaeus and in Critias.
Demographics As of 2026, the population is 3,029, of which 49.2% are male, and 50.8% are female. Minors make up 10.7% of the population, and seniors make up 34.7%.
Immigration As of 2025, immigrants make up 1.7% of the total population. The 5 largest foreign countries of birth are Germany, Romania, France, Poland, and Belgium.
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