Dumai Garh is a village in Manjhi tehsil in district of Saran, Bihar, India. As per the data provided by Census of India in 2011, total population of Dumai Garh was 3,604 which includes 1,857 males and 1,747 females. Dumai Garh covers 508 ha area. Pincode of Dumai Garh is 841209.