Siwan subdivision is one two subdivisions of Siwan district (out of 101 subdivisions of Bihar). It comprises 13 blocks of Siwan. The total area of the subdivision is and total population is 2,288,559.
Blocks of Siwan subdivision CD block Area (km2) Population (2011)Andar 120.41 110,027Barharia 177.27 321,292Darauli 172.80 174,357Guthani 91.70 128,155Hasanpura 96.56149,580Hussainganj 85.37 182,794Mairwa 69.17113,499Nautan 65.39 90,714Panchrukhi (Community development block) 124.33 201,759Raghunathpur (Community development block) 156.03 157,694Siswan (Community development block) 115.78 153,953Siwan (Community development block) 137.34 340,983Ziradei (Community development block) 124.03 163,752
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