Chainpur Alinagar is a village in Barharia tehsil in district of Siwan, Bihar, India. As per the data provided by Census of India in 2011, total population of Chainpur Alinagar was 723 which includes 391 males and 332 females. Chainpur Alinagar covers 49 ha area. Pincode of Chainpur Alinagar is N/A.