Chainpur is one of the largest villages of Saharsa District in the Indian state of Bihar in North-East India, and is in the Kosi Division. Chainpur has a number of tolas and occasionally called Pubari, Pachhwari, Uttarwari and Dakshinwari tola.
Chainpur is part of Kahra Block. Chainpur is located in among Bariahi, Bangaon, Parari and Mahishi.
Shri Chandramohan Jha (also known as Sohan Jha) has served as the Gram Pradhan of Chainpur from 14 June 1978 till 2006 and then again from 2011 till date. Chandramohan Jha after winning the Chainpur Gram Panchayat Elections of 2011.
In 2016, SMT. Soni Thakur has been elected Mukhia and SMT. Ritu Devi as Sarpanch.
Chainpur and its surrounding areas are a flat alluvial plain forming part of the Kosi river basin. This makes the land very fertile.
Flooding is a major reason for the poor connectivity of the area as bridges tend to get washed away.
Paddy, wheat, moong, maize, sugarcane etc. are the main crops of this village. vegetables viz. potato, cauliflower, brinjal, carrot, raddish, lady finger etc., are cultivated in this village.
Kaali puja, Holi and Durga Puja are the main festival of Chainpur. Janmashtami, shivaratri, hanuman jayanti etc. are also celebrated with full zest and fervour. Sama Chakeva, chhath, chaurchan etc. are other festivals of this village. There are several places of worship in this village. The neelkanth mandir, which is a very old shiv mandir, is famous for its architectural excellence. Kaali mandir (old & new), durga mandir (oldest worship place of this village), vishnu mandir, radha krishn kuti, brahm baba sthan, etc. are other place of importance. Every year, a grand mela is organised on the occasion of kaali puja in this village.
Late Shri Virendra Mishra alias Harekrishna Mishra 'Chainpuri' fought for freedom against English. Late Bhola Thakur laid his life for the cause of this land during Quit India Movement.