As of 31 December 2004, it had a population of 1,280 and an area of 26.4 square kilometres (10.2 sq mi).

[3] Petrella Tifernina borders the following municipalities: Castellino del Biferno, Limosano, Lucito, Matrice, Montagano.

It has generally replaced the village's piazza as the main gathering place for its residents.

Since the end of World War II until the 1970s, the town's population declined considerable due to emigration.

The places of choice for these emigrants were the Canadian cities of Montreal and Toronto.