Purnia (also romanized as Purnea) is a city with a population of over 310,800 that serves as the administrative headquarters of both Purnia district and Purnia division in the Indian state of Bihar. It is the largest city in north-eastern Bihar also known as Kosi-Seemanchal area. Total geographical area of Purnia Urban Agglomeration is 92 km (35.52 sq mi) which is next only to Patna. Population density of the city is 3,058 persons per km sq. making it the 7th largest city of Bihar by population. Just after Patna, Gaya, Bhagalpur, Muzaffarpur, Bihar sharif, Darbhanga.