Cagliari (Italian: Provincia di Cagliari; Sardinian: Provìntzia de Casteddu) is a province in the autonomous island region of Sardinia in Italy. Its capital is the city of Cagliari.
It has an area of 4,470 km², and a total population of 543,310 (2001). There are 71 comuni (singular: comune) in the province.
The valley of Piscinamanna is in the province.
As of June 30, 2005, the major comuni by population are:
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Area:
- 4,570 km² (1764 mi² )
Population:
- 543,310 (2001)