Siwan have 37 pincodes.

Chainpur (Siwan) 9 locations 841203
Gangpur Siswan 7 locations 841210
Baghauna 1 locations 841223
Satation Road 21 locations 841226
Gaushalaroad Siwan 18 locations 841227
Andar 9 locations 841231
Barhria 6 locations 841232
Daronda 10 locations 841233
Darauli 8 locations 841234
Done 10 locations 841235
Hasanpura 7 locations 841236
Hussainganj 5 locations 841237
Mahrajganj (Siwan) 17 locations 841238
Mairwa 22 locations 841239
Mahuwal Mahal 4 locations 841240
Pachrukhi 9 locations 841241
Paterhi 4 locations 841242
Sahpur 13 locations 841243
Takipur 7 locations 841244
Zeradei 21 locations 841245
Bakerganj 6 locations 841286
Asaon 4 locations 841287
Bagaura 7 locations 841404
Basantpur (Siwan) 16 locations 841406
Bhagwanpur Hat 7 locations 841408
Kishunpura 8 locations 841416
Sagar Sultanpur 1 locations 841417
Bankat 1 locations 841422
Goreakothi 8 locations 841434
Guthni 9 locations 841435
Mustfabad 9 locations 841439
Narendrapur 1 locations 841446
Khujhwa 3 locations 841502
Raghunathpur (Siwan) 7 locations 841504
Tarwara 14 locations 841506
Mora (Siwan) 9 locations 841507
Gabhirar 4 locations 841509