Mainar is a municipality in the province of Zaragoza, in the autonomous community of Aragon, Spain. It is a small, sparsely populated settlement in this part of northeastern Spain.
According to the 2004 census carried out by Spain's National Statistics Institute (INE), the municipality had a population of 162 inhabitants. This figure reflects Mainar's character as a small rural municipality with a low population density.
As a municipality, Mainar forms part of the local administrative structure of the province of Zaragoza within Aragon. Its recorded population of 162 in 2004 places it among the smaller municipalities of the region.