The ultra-Orthodox sector will likely make up 25% of Israel's population by 2050, the National Economic Council projected in a report released last week.
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The Jewish state's population will surge by 70% over the next three decades, the NEC said, adding that according to its demographic forecast, 80% of the overall population will be Jewish and 20% will be Arab and other minorities.
"By 2050, Israel's current population of 9.2 million is expected to grow to almost 16 million, with 3.8 million projected to be ultra-Orthodox, up from 12.6% of the population at this time," said the report.
The predicted growth of ultra-Orthodox, which is the collective term for the traditionalist branches of contemporary Judaism, is expected to result from the community's birth rate of 6.7 children per woman, it added.
"Most of the ultra-Orthodox Jews are expected to remain in Jerusalem and its surrounding area, as well as in Israel's south where plans for a new ultra-Orthodox city are underway," the report said.
According to the forecast, the ultra-Orthodox community in northern Israel will grow even faster but at a smaller scale.
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Israel's population growth is projected to place greater demands on the country's housing stock, already considered to be insufficient, as well as transportation networks and the education system.
The National Economic Council was formed in 2006 as an advisory division in the Prime Minister's Office with the goal of answering the demand for a professional economic body with a macroeconomic perspective and a high analytical ability.
JNS.org and i24NEWS contributed to this report.