Purnia is the fourth largest city in Bihar and is emerging as the largest economic center in north Bihar. It serves as the administrative headquarters of both Purnia district and Purnia division in the Indian state of Bihar. It is known for its favorable climate, like Darjeeling, and has abundant resources for human settlements and economic activities.
The total geographical area of Purnia urban agglomeration is 92 km2 (35.52 sq mi), closest to Patna. The population density of the city is 3,058 people per square kilometer, making it the fourth largest city in Bihar by population. It is almost 315 km from Patna as well as 171 km from Siliguri and 90 km from Bhagalpur. It is located 640 km from Guwahati (approximately) and 450 km from Kolkata, capital of the neighboring state of West Bengal and the largest city in eastern India. Purnia district covers 3202.31 square kilometers of the state of Bihar. The Indian Army, the Indian Air Force and three of the five branches of the Indian Central Armed Forces - the Border Security Force (BSF), the Sashastra Seema Bal (SSB) and the Indo-Tibetan Border Police (ITBP) - They have bases nearby. the district.
