The fourth-largest city in Bihar, Purnia (sometimes spelled Purnea) is quickly becoming the main economic center of North Bihar. In the Indian state of Bihar, it functions as the administrative center for the Purnia division and Purnia district. Similar to Darjeeling, it is well renowned for having a pleasant temperature and an abundance of resources for habitation and business ventures.

Only Patna is closer to Purnia Urban Agglomeration’s 92 km2 (35.52 sq mi) overall geographic area. The city is the fourth most populous in Bihar with a population density of 3058 people per km³.The distances are around 315 km from Patna, 171 km from Siliguri, and 90 km from Bhagalpur