Lachhuman Dumari is a village in Raghunathpur tehsil in district of Siwan, Bihar, India. As per the data provided by Census of India in 2011, total population of Lachhuman Dumari was 916 which includes 481 males and 435 females. Lachhuman Dumari covers 59 ha area. Pincode of Lachhuman Dumari is N/A.