Sikkim 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 19 PIN codes in Sikkim.
Quick 30-Second Overview / त्वरित सारांश
Sikkim operates under the 737 PIN code prefix across 6 districts. Nestled beneath Mount Kanchenjunga (8,586 m), mail transits via Siliguri (West Bengal) along National Highway 10 into Gangtok.
1. Geographic Profile / भौगोलिक प्रोफ़ाइल: Area, Coordinates & Boundaries
To understand how mail and logistics flow across Sikkim, 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 | 7,096 sq km (2nd smallest state in India) |
| Latitude Span | 27°04' N to 28°07' N |
| Longitude Span | 88°00' E to 88°55' E |
| Northern Boundary | Tibet / China |
| Southern Boundary | West Bengal (Darjeeling and Kalimpong) |
| Eastern Boundary | Bhutan and Tibet (Chumbi Valley) |
| Western Boundary | Nepal (Kanchenjunga Range) |
Click to view Sikkim map
Interactive OpenStreetMap with district borders
Key Geographic Features:
- Rugged Himalayan geography ranging from sub-tropical valley floors to Mount Kanchenjunga (3rd highest peak on Earth).
- Teesta river is the lifeline of the state, carving deep mountain valleys.
- Bordered by three foreign countries: Nepal, China (Tibet), and Bhutan.
2. Postal Network / डाक नेटवर्क Architecture in Sikkim
Every PIN (Postal Index Number) in Sikkim is structured to optimize automated sorting and daily last-mile dispatch across 206 post offices.
3. Major Postal Districts in Sikkim
Below is the breakdown of the most active postal districts in Sikkim, ranked by their assigned PIN codes and delivery coverage:
4. Key PIN Codes & Central Post Offices in Sikkim
These central PIN codes manage the highest mail volume, express parcel sorting, and government document dispatches in Sikkim:
| PIN Code | Primary Post Office | District | Offices Covered |
|---|---|---|---|
| 737134 | Singtam SO | EAST SIKKIM | 25 |
| 737121 | Naya Bazar SO West Sikkim | EAST SIKKIM | 22 |
| 737116 | Mangan SO | EAST SIKKIM | 17 |
| 737126 | Namchi SO | EAST SIKKIM | 16 |
| 737113 | Pelling SO | EAST SIKKIM | 15 |
| 737111 | Gayzing SO | WEST SIKKIM | 14 |
| 737139 | Ravangla SO | EAST SIKKIM | 11 |
| 737102 | Deorali SO | EAST SIKKIM | 10 |
| 737106 | Pakyong SO | EAST SIKKIM | 10 |
| 737128 | Melli Bazar SO | SOUTH SIKKIM | 10 |
5. Practical Addressing Tips for Sikkim (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 Sikkim:
- All incoming mail for Sikkim routes through Siliguri Railway Mail Service (West Bengal) before ascending to Gangtok.
- Monsoon landslides along NH-10 can occasionally delay road-bound parcel transit.
- North Sikkim border posts (Lachen, Lachung, Chungthang) require extra transit buffer during winter snowfall.
House/Plot No., Street/Locality Name
Sub-District / Mandal / Tehsil
District, Sikkim – [6-DIGIT PIN CODE]
Editorial Note & Verification Standard
Explaining why Sikkim mail relies entirely on the Siliguri (WB) transit corridor resolves frequent tracking queries from users.
Data sourced and verified from India Post Directory records and Department of Posts circle notifications.
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