n the Indian state of Bihar, Hussainganj is a town and community development block located in the Siwan district. It is one of the Siwan subdivision’s thirteen blocks. The block’s headquarters are located in the town of Hussainganj.

The block has a total size of 85.37 square kilometers (32.96 square miles), and 1,82,794 people were living there as per the Indian census conducted in 2011.

There are numerous gram panchayats and villages within the block.