Rengmong Lalargaon is a village in Ramkrishna Nagar tehsil in district of Karimganj, Assam, India. As per the data provided by Census of India in 2011, total population of Rengmong Lalargaon was 286 which includes 139 males and 147 females. Rengmong Lalargaon covers 14.73 ha area. Pincode of Rengmong Lalargaon is 788737.