Piershil is a town in the Dutch province of South Holland. It is a part of the municipality of Korendijk, and lies about 5 km south of Spijkenisse. In 2001, the town of Piershil had 1185 inhabitants. The built-up area of the town was 0.24 km², and contained 477 residences. The statistical area "Piershil", which also can include the peripheral parts of the village, as well as the surrounding countryside, has a population of around 1570. Piershil was a separate municipality between 1817 and 1984, when it became part of Korendijk.