Quartu Sant'Elena, located four miles East from Cagliari on the ancient Roman road, is a city and comune in the Metropolitan City of Cagliari, Sardinia, Italy. It is the third biggest city of Sardinia with a population of 71,216 as of 2015.

The Metropolitan City of Cagliari is a metropolitan city in Sardinia, Italy. Its capital is the city of Cagliari and includes 17 comuni. It was established by law in 2016 and replaced the province of Cagliari. The current president is the mayor of Cagliari, Paolo Truzzu. The resident population is approximately 432,000. This figure can rise due to commuting into the functional urban area to approximately 477,000.