Something to know before booking hotels in rome. The City of Rome has a population of some 2.8 million people. The Rome province - which encompasses areas including Ostia south west of Rome, the Castelli Romani and Colli Albani to the south east, Tivoli to the east, Cerveteri and Lago di Bracciano to the north east - has a population of 4 million. The Lazio Region, which comprises the provinces of Rome, Rieti, Viterbo, Latina and Frosinone, has a total population of 5.5 million.... Continuar leyendo