Lengraigaon is a village in Tengakhat tehsil in district of Dibrugarh, Assam, India. As per the data provided by Census of India in 2011, total population of Lengraigaon was 644 which includes 313 males and 331 females. Lengraigaon covers 200 ha area. Pincode of Lengraigaon is 786103.