An increase in death toll is highly likely as dozens of mountain villages have been devastated.
Rescuers were working through the night to pull survivors from the rubble and "won't slow down".
The earthquake has also damaged culturally important sites such as churches and cemeteries, leaving Virgin Mary statues and coffins in the rubble.
Italian Prime Minister Matteo Renzi has declared a state of emergency.
Pope Francis on Monday met Facebook founder Mark Zuckerberg wife, Priscilla Chan at the Vatican.
Two powerful earthquakes struck central Italy on Wednesday, two months after a quake in central Italy killed nearly 300 people.