Bagnaria () is a (municipality) in the Province of Pavia in the Italian region of Lombardy, located about south of Milan and about south of Pavia. As of 31 December 2004, it had a population of 640 and an area of .All demographics and other statistics: Italian statistical institute Istat.

Bagnaria borders the following municipalities: Gremiasco, Ponte Nizza, Varzi.

Demographic evolution

References