The Palestinian Central Bureau of Statistics says it has recorded a population of 12.1 million people, of whom 4.6 million live in the territories and the remainder abroad.
The figures show that at the end of 2014, 2.8 million Palestinians lived in the West Bank and 1.8 million in the Gaza Strip.
In the impoverished Gaza enclave, the population of 4.9 people per square kilometer makes its density one of the world’s highest.
Of the 4.6 million people in the Palestinian territories, 43.1% are refugees.
The balance of 7.5 million Palestinians live in exile, the majority in 31 UN-installed refugee camps in Jordan, Lebanon and Syria.
UNRWA, the world body’s aid agency for Palestinian refugees, has 5.49 million people registered on its books.