| Area-wise Number of Postal Colonies in Bihar (December, 2005) | |
| Area | Number of Postal Colonies |
| Patna | |
| Bhagalpur | |
| Aurangabad | |
| Bhojpur | |
| Nalanda | |
| Rohtas | |
| Vaishali | |
| Munger | |
| Nawada | |
| Gaya | |
| Saran | |
| Siwan | |
| Pashchim Champaran | |
| Purba Champaran | |
| Purnea | |
| Saharsa | |
| Madhubani | |
| Darbhanga | |
| Samastipur | |
| Sitamarhi | |
| Muzaffarpur | |
| Begusarai | |
| Bihar | |
| India | |
