Purnia is a city and a Municipal Corporation in Purnia district of the Indian state of Bihar. It is located 400 km from Patna. The Indian army, Border Security Force (BSF),and the SSB have bases around the city. The Purnea Airport, which serves the city, is located within the Indian Air Force's cantonment area.
Purnia has a tradition of at least a few centuries behind it. Under the Mughal rule, the district comprised Sarkar Tajpur, east of the Mahananda and Sarkar Purnia, west of the river. Purnia, at that time was a great military seat under the rule of a Fauzadar as a frontier district; Purnia has always had an extra administrative importance. Even in the early British days, Purnia was considered to be an important responsibility particularly as it was located on the border of Nepal.
Hindi, Bengali Urdu and Santhali are the principal languages of Purnia, spoken with Maithili, Surjapuri, Polia,Angika and Santhali dialects. In most of the parts of Purnia, Maithili is spoken.