Bihar PIN Code, Geographic Boundaries, Coordinates & Postal Directory
A comprehensive, verified guide covering the geographic boundaries, land area, latitude/longitude coordinates, postal circle headquarters, and all 856 PIN codes in Bihar.
Quick 30-Second Overview / त्वरित सारांश
Bihar PIN codes start with 80, 81, 82, 84, and 85 across 38 districts. Divided by the Ganges River into North and South Bihar, Patna GPO anchors one of India's most densely populated postal networks.
1. Geographic Profile / भौगोलिक प्रोफ़ाइल: Area, Coordinates & Boundaries
To understand how mail and logistics flow across Bihar, we must first look at its geography. Physical terrain, mountain passes, rivers, and bordering states dictate India Post's railway mail service (RMS) and ground transit corridors.
| Geographic Metric | Official Measurement |
|---|---|
| Total Land Area | 94,163 sq km |
| Latitude Span | 24°20' N to 27°31' N |
| Longitude Span | 83°19' E to 88°17' E |
| Northern Boundary | Nepal (International Border) |
| Southern Boundary | Jharkhand |
| Eastern Boundary | West Bengal |
| Western Boundary | Uttar Pradesh |
Click to view Bihar map
Interactive OpenStreetMap with district borders
Key Geographic Features:
- Extremely flat Gangetic plain split by the River Ganges flowing west to east.
- North Bihar borders the Himalayan foothills of Nepal, intersected by Kosi, Gandak, and Bagmati rivers.
- South Bihar transitions into the Chota Nagpur plateau fringes in Gaya and Rohtas.
2. Postal Network / डाक नेटवर्क Architecture in Bihar
Every PIN (Postal Index Number) in Bihar is structured to optimize automated sorting and daily last-mile dispatch across 9,079 post offices.
3. Major Postal Districts in Bihar
Below is the breakdown of the most active postal districts in Bihar, ranked by their assigned PIN codes and delivery coverage:
4. Key PIN Codes & Central Post Offices in Bihar
These central PIN codes manage the highest mail volume, express parcel sorting, and government document dispatches in Bihar:
| PIN Code | Primary Post Office | District | Offices Covered |
|---|---|---|---|
| 845438 | Bettiah HO | WEST CHAMPARAN | 39 |
| 811105 | Sheikhpura Bazar SO | SHEIKHPURA | 36 |
| 811311 | Lakhisarai Court SO | LAKHISARAI | 34 |
| 803110 | Harnaut SO | NALANDA | 34 |
| 813101 | Amarpur SO Banka | BHAGALPUR | 32 |
| 848114 | Dalsinghsarai SO | SAMASTIPUR | 32 |
| 853204 | Naugachia SO | BHAGALPUR | 32 |
| 824232 | Fatehpur SO Gaya | GAYA | 31 |
| 854318 | Forbesganj SO | ARARIA | 30 |
| 843302 | Janaki Asthan SO | SITAMARHI | 30 |
5. Practical Addressing Tips for Bihar (Save Time & Money)
Writing an address correctly ensures your Speed Post or parcel reaches the recipient without delay or return to sender. Here are specific rules for Bihar:
- North Bihar PINs (84, 85) sort predominantly through Muzaffarpur and Samastipur RMS.
- South Bihar PINs (80, 81, 82) sort through Patna and Gaya sorting divisions.
- Always specify the block/taluka name because multiple villages share names across neighboring districts.
House/Plot No., Street/Locality Name
Sub-District / Mandal / Tehsil
District, Bihar – [6-DIGIT PIN CODE]
Editorial Note & Verification Standard
Clear division between North Bihar (84/85 prefix) and South Bihar (80/81/82 prefix) eliminates sorting confusion for users.
Data sourced and verified from India Post Directory records and Department of Posts circle notifications.
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