Chhapra grew in importance as a river-based market in the 18th century when the Dutch,[5][6] French, Portuguese, and English established saltpeter refineries in the area. It was recognised as a municipality in 1864.[citation needed] The major railway station is Chhapra Junction. There is a well known[7] Shaktipeeth temple in Chhapra named Ambika Bhavani.
India's biggest double-deckerflyover is being constructed in Chhapra.[9] This 3.5 km long double-deckerflyover from Bhikhari Chowk to Bus Stand,[10] is being constructed at the cost of ₹ 411.31 crore from the central road fund (CRF) under engineering procurement construction (EPC) mode by Bihar Rajya Pul Nirman Nigam Limited (BRPNNL).[11][12] It is longer than the 1.8 km double-deckerflyover in Santa Cruz–Chembur Link Road.[13] Chief Minister Nitish Kumar laid the foundation stone of in July 2018. It is estimated to be completed before 2026.[14]
As per 2011 census, Chapra Urban Agglomeration had a population of 212,955.[16] Chapra Urban Agglomeration includes Chapra (Nagar Panchayat) and Sandha (Census Town).[17] Chapra Nagar Panchayat had a total population of 201,597, out of which 106,250 were males and 95,347 were females. It had a sex ratio of 897 females to 1000 males. The population in the age range of 0–6 years was 27,668. The effective literacy rate of those aged 7 years and older in Chhapra was 81.30% as of 2011.[18]
Hinduism is the largest religion in Chhapra city with 1,64,811 Hindus (81.45%). Islam is the second largest religion in Chhapra city with 36,639 Muslims (18.11%). Other religions includes 219 Christians (0.11%), 100 Jains (0.05%), 55 Sikhs (0.03%), 14 Buddhists (0.01%), 514 did not answer (0.25%).[19]