| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 801 | Saistabad | Madhurapur BO | 📍 851113 | Teghra | Branch Post Office |
| 802 | Sakarbasa | Sakarbasa BO | 📍 848202 | Cheria Bariarpur | Branch Post Office |
| 803 | Sakra | Rajaur BO | 📍 848204 | Garhpura | Branch Post Office |
| 804 | Sakrauli | Bashi BO | 📍 848202 | Cheria Bariarpur | Branch Post Office |
| 805 | Sakrauli | Sakrauli BO | 📍 848202 | Cheria Bariarpur | Branch Post Office |
| 806 | Salauna | B.Bazar SO | 📍 848201 | Bakhri | Branch Post Office |
| 807 | Saleh Chak | Lakhminia SO | 📍 851211 | Balia | Post Office - PO |
| 808 | Salemabad | Salemabad BO | 📍 851217 | Sahebpur Kamal | Branch Post Office |
| 809 | Salempur | Samsipur Bhith BO | 📍 851111 | Bachhwara | Branch Post Office |
| 810 | Salempur | M.Babhangama BO | 📍 851112 | Barauni | Branch Post Office |
| 811 | Salempur | Naipur BO | 📍 851128 | Mansurchak | Branch Post Office |
| 812 | Salempur Baro | Baro SO | 📍 851118 | Barauni | Post Office - PO |
| 813 | Salha | Mirzapur Banduar SO | 📍 851129 | Shamho Akha Kurha | Post Office - PO |
| 814 | Saligrami | Saligrami BO | 📍 851217 | Sahebpur Kamal | Branch Post Office |
| 815 | Salkhu Teghra | Mirzapur Banduar SO | 📍 851129 | Begusarai | Post Office - PO |
| 816 | Samastipur | Samastipur BO | 📍 851217 | Sahebpur Kamal | Branch Post Office |
| 817 | Samho | Mirzapur Banduar SO | 📍 851129 | Shamho Akha Kurha | Post Office - PO |
| 818 | Samsa | Samsa BO | 📍 848201 | Naokothi | Branch Post Office |
| 819 | Samsipur | Chirainyatol BO | 📍 851111 | Bachhwara | Branch Post Office |
| 820 | Samsipur Bhith | Samsipur Bhith BO | 📍 851111 | Teghra | Branch Post Office |
| 821 | Sandalpur | Sandalpur BO | 📍 851217 | Sahebpur Kamal | Branch Post Office |
| 822 | Sanha | Sanha BO | 📍 851217 | Sahebpur Kamal | Branch Post Office |
| 823 | Sanjat | Sanjat BO | 📍 851133 | Bhagwanpur | Branch Post Office |
| 824 | Sankh | Sankh BO | 📍 851131 | Begusarai | Branch Post Office |
| 825 | Santanpur | Madhurapur BO | 📍 851113 | Teghra | Branch Post Office |
| 826 | Santha Rasidpur | Rasidpur BO | 📍 851128 | Mansurchak | Branch Post Office |
| 827 | Sanwak | Begusarai HO | 📍 851101 | Begusarai | Head Post Office - H |
| 828 | Sapahua | Sakarpura SO | 📍 848203 | Chhorahi | Post Office - PO |
| 829 | Sarai Nurnagar | Mansurchak SO | 📍 851128 | Mansurchak | Post Office - PO |
| 830 | Saraia | Sahebpur Kamal SO | 📍 851217 | Sahebpur Kamal | Post Office - PO |
| 831 | Saraunja | Saraunja BO | 📍 851127 | Birpur | Branch Post Office |
| 832 | Sathkurwa | Mirzapur Banduar SO | 📍 851129 | Shamho Akha Kurha | Post Office - PO |
| 833 | Satrajepur | Lakhanpur BO | 📍 851133 | Bhagwanpur | Branch Post Office |
| 834 | Sawat | Sakarpura SO | 📍 848203 | Chhorahi | Post Office - PO |
| 835 | Seampur | Dunhi BO | 📍 848204 | Chhorahi | Branch Post Office |
| 836 | Semaria | Simaria BO | 📍 851126 | Barauni | Branch Post Office |
| 837 | Semaria | Simaria Ghat BO | 📍 851126 | Barauni | Branch Post Office |
| 838 | Semrauna | Babhangama BO | 📍 851131 | Barauni | Branch Post Office |
| 839 | Semri | Sonma BO | 📍 848201 | Bakhri | Branch Post Office |
| 840 | Shahbegpur | Gokhle Nagar Bishanpur BO | 📍 851211 | Balia | Branch Post Office |
| 841 | Shahpur | Lakhanpatti BO | 📍 848204 | Chhorahi | Branch Post Office |
| 842 | Shahpur | Sahpur BO | 📍 851129 | Begusarai | Branch Post Office |
| 843 | Shahpur | Mehdasahpur BO | 📍 851132 | Cheria Bariarpur | Branch Post Office |
| 844 | Shahpur | Gokhle Nagar Bishanpur BO | 📍 851211 | Balia | Branch Post Office |
| 845 | Shahpur Kamal | Sahebpur Kamal SO | 📍 851217 | Sahebpur Kamal | Post Office - PO |
| 846 | Shakarpura | Sakarpura SO | 📍 848203 | Bakhri | Post Office - PO |
| 847 | Shakhawatpur | Madhurapur BO | 📍 851113 | Teghra | Branch Post Office |
| 848 | Shamho Akha Kurha | Mirzapur Banduar SO | 📍 851129 | Shamho Akha Kurha | Post Office - PO |
| 849 | Shamsa | Samsa BO | 📍 851128 | Mansurchak | Branch Post Office |
| 850 | Shamsuddinpur | Parna BO | 📍 851131 | Begusarai | Branch Post Office |