| S. No | Parliament Constituency |
| 1 | Valmikinagar |
| 2 | Paschim Champaran |
| 3 | Purvi Champaran |
| 4 | Sheohar |
| 5 | Sitamarhi |
| 6 | Madhubani |
| 7 | Jhanjharpur |
| 8 | Supaul |
| 9 | Araria |
| 10 | Kishanganj |
| 11 | Katihar |
| 12 | Purnia |
| 13 | Madhepura |
| 14 | Darbhanga |
| 15 | Muzaffarpur |
| 16 | Vaishali |
| 17 | Gopalganj |
| 18 | Siwan |
| 19 | Maharanjganj |
| 20 | Saran |
| 21 | Hajipur (PART I-IV) & (Schedule-I-IX) |
| 22 | Ujiarpur |
| 23 | Samastipur |
| 24 | Begusarai |
| 25 | Khagaria |
| 26 | Bhagalpur |
| 27 | Banka |
| 28 | Munger |
| 29 | Nalanda |
| 30 | Patna Sahib |
| 31 | Patliputra |
| 32 | Arrah |
| 33 | Buxar |
| 34 | Sasaram |
| 35 | Karakat |
| 36 | Jehanabad |
| 37 | Aurangabad |
| 38 | Gaya |
| 39 | Nawada |
| 40 | Jamui |