Postal code range for the state of Bihar lies between 800001 - 855117.The list of districts and their corresponding postal code ranges in Bihar are as follows:
| Districts | Postal Code Range |
|---|---|
| Araria | 854102-854336 |
| Arwal | 804401-824127 |
| Aurangabad(BH) | 824101-824303 |
| Banka | 811308-814131 |
| Begusarai | 811106-851218 |
| Bhagalpur | 811211-853205 |
| Bhojpur | 802152-841312 |
| Buxar | 802101-802313 |
| Darbhanga | 846001-852216 |
| East Champaran | 845301-845458 |
| Gaya | 804401-824237 |
| Gopalganj | 841405-841508 |
| Jamui | 811301-811317 |
| Jehanabad | 804405-824235 |
| Kaimur (Bhabua) | 802132-821110 |
| Katihar | 853204-855114 |
| Khagaria | 811202-853203 |
| Kishanganj | 855101-855117 |
| Lakhisarai | 811106-811315 |
| Madhepura | 813204-853204 |
| Madhubani | 847102-847452 |
| Munger | 811201-853204 |
| Muzaffarpur | 842001-847307 |
| Nalanda | 801301-811104 |
| Nawada | 803109-805141 |
| Patna | 800001-811302 |
| Purnia | 853204-854337 |
| Rohtas | 802211-821312 |
| Saharsa | 852106-852221 |
| Samastipur | 844501-848506 |
| Saran | 841101-841460 |
| Sheikhpura | 811101-811315 |
| Sheohar | 843313-843334 |
| Sitamarhi | 843301-847307 |
| Siwan | 841203-841509 |
| Supaul | 847408-854340 |
| Vaishali | 843102-844509 |
| West Champaran | 845101-845459 |