| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 1101 | Hussainganj | Partap Pur BO | 📍 841226 | Hussainganj | Branch Post Office |
| 1102 | Hussainganj | Hussainganj SO | 📍 841237 | Hussainganj | Post Office - PO |
| 1103 | Hussainpur nand | Hussaipurnand BO | 📍 841406 | Basantpur | Branch Post Office |
| 1104 | Hussepur | Hussaipurnand BO | 📍 841406 | Basantpur | Branch Post Office |
| 1105 | I Z Chorawali | Chorauli BO | 📍 841406 | Bhagwanpur Hat | Branch Post Office |
| 1106 | Idilpur | Tari BO | 📍 841509 | Raghunathpur | Branch Post Office |
| 1107 | Idrish Miya tola | English BO | 📍 841239 | Mairwa | Branch Post Office |
| 1108 | Ijra | Hasanpura SO | 📍 841236 | Siswan | Post Office - PO |
| 1109 | Imadpur | Nabiganj BO | 📍 841407 | Lakri Nabiganj | Post Office - PO |
| 1110 | Inait Chapra | Barhria SO | 📍 841232 | Barharia | Post Office - PO |
| 1111 | Inda | Sonbarsa BO | 📍 841241 | Daraundha | Branch Post Office |
| 1112 | Indapur | Sonbarsa BO | 📍 841241 | Maharajganj | Branch Post Office |
| 1113 | Indauli | Marachhi BO | 📍 841434 | Lakri Nabiganj | Branch Post Office |
| 1114 | Indauli Khas | Sikandrpur BO | 📍 841434 | Barharia | Branch Post Office |
| 1115 | Indauli Siraj | Barhria SO | 📍 841232 | Barharia | Post Office - PO |
| 1116 | Indra Puri Mohala | Siwan HO | 📍 841226 | Siwan | Head Post Office - H |
| 1117 | Indrak Chak | Darauli SO | 📍 841234 | Darauli | Post Office - PO |
| 1118 | Inocome tax office | Siwan HO | 📍 841226 | Siwan | Head Post Office - H |
| 1119 | Ishopur | Gangpur Siswan SO | 📍 841210 | Siswan | Post Office - PO |
| 1120 | Islam Gary | Harihans BO | 📍 841286 | Hussainganj | Branch Post Office |
| 1121 | Islampur | Tarwaparsa BO | 📍 841240 | Daraundha | Branch Post Office |
| 1122 | Ismail Chak | Siswan Kala BO | 📍 841236 | Siswan | Branch Post Office |
| 1123 | Itahari | Pachrukhi SO | 📍 841241 | Maharajganj | Post Office - PO |
| 1124 | Ithari | Bagaura SO | 📍 841404 | Daraundha | Post Office - PO |
| 1125 | Itwa | Itwa Bartwalia BO | 📍 841241 | Pachrukhi | Branch Post Office |
| 1126 | Jadimatma | Bargaon BO | 📍 841239 | Mairwa | Branch Post Office |
| 1127 | Jafra | Sarwe BO | 📍 841227 | Siwan | Branch Post Office |
| 1128 | Jagarnathpur | Rachhopali BO | 📍 841427 | Barharia | Branch Post Office |
| 1129 | Jagarnathpur | Saidpura BO | 📍 841439 | Goriakothi | Branch Post Office |
| 1130 | Jagatpur | Jagatpur BO | 📍 841406 | Lakri Nabiganj | Branch Post Office |
| 1131 | Jagatpur | Sawana BO | 📍 841438 | Barharia | Branch Post Office |
| 1132 | Jagdish Banmara | Mairwa SO | 📍 841239 | Mairwa | Post Office - PO |
| 1133 | Jagdishpur | Jagdishpur BO | 📍 841203 | Siswan | Branch Post Office |
| 1134 | Jagdishpur | Murakhap BO | 📍 841235 | Goriakothi | Branch Post Office |
| 1135 | Jagdishpur | Mahrajganj SO Siwan | 📍 841238 | Maharajganj | Post Office - PO |
| 1136 | Jagdishpur | Jagdishpur Kothi BO | 📍 841243 | Nautan | Branch Post Office |
| 1137 | Jagdishpur | Bagaura SO | 📍 841404 | Hasanpura | Post Office - PO |
| 1138 | Jagdishpur | Bhagwanpur Hat SO | 📍 841408 | Bhagwanpur Hat | Post Office - PO |
| 1139 | Jagdishpur | Rachhopali BO | 📍 841427 | Barharia | Branch Post Office |
| 1140 | Jagdishpur | Sani Basantpur BO | 📍 841439 | Goriakothi | Branch Post Office |
| 1141 | Jagdishpur Kothi | Jagdishpur Kothi BO | 📍 841243 | Nautan | Branch Post Office |
| 1142 | Jagubhagat ke Tola | Gaighat BO | 📍 841231 | Hasanpura | Branch Post Office |
| 1143 | Jagubhagat ke tola | Dhanutihata BO | 📍 841236 | Hasanpura | Branch Post Office |
| 1144 | Jaijor | Jaijore BO | 📍 841231 | Andar | Branch Post Office |
| 1145 | jaijore | Jaijore BO | 📍 841231 | Andar | Branch Post Office |
| 1146 | Jaijori | Nand Pur Amwari BO | 📍 841231 | Raghunathpur | Branch Post Office |
| 1147 | Jain BO | Jain BO | 📍 841228 | Siwan | Branch Post Office |
| 1148 | Jalalpur | Jalalpur BO | 📍 841233 | Daraundha | Branch Post Office |
| 1149 | Jalalpur | Dhanutihata BO | 📍 841236 | Hasanpura | Branch Post Office |
| 1150 | Jalalpur | Rajanpura BO | 📍 841236 | Hasanpura | Branch Post Office |