The province of Chieti is a province in the Abruzzo region of Italy. Its provincial capital is the city Chieti, which has a population of 50,770 i…The province of Chieti is a province in the Abruzzo region of Italy. Its provincial capital is the city Chieti, which has a population of 50,770 inhabitants. The province has a total population of 387,649 inhabitants as of 2017 and spans an area of 2,599.58 square kilometres. The province contains 104 comuni. Its provincial president is Mario Pupillo.