Purainia is a village in West Champaran district in the Indian state of Bihar.

As of 2011 India census, Purainia had a population of 3538 in 653 households.

In Purainia, 21.6% of the population is under 6 years of age.

The village is home to a hotel, a welding shop, a playground, a middle school, multiple stores, and a restaurant.

This article related to a location in Bihar is a stub.