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PIN code 737131 is the Postal Index Number assigned to the Chujachen BO post office in EAST SIKKIM district, Sikkim. It is administered under the West Bengal Circle Postal Circle. The code falls under Zone 7 of India's postal network, covering the Eastern India region.
India's PIN code system — standing for Postal Index Number — was introduced on 15 August 1972 to streamline postal sorting and delivery across the country. Each 6-digit code is structured systematically: the first digit (7) identifies the broad postal zone; the first three digits (737) pinpoint the postal district or sorting hub; and the last three digits (131) identify the specific delivery post office.
When addressing letters, parcels, or courier shipments to Chujachen BO in EAST SIKKIM, Sikkim, always include PIN – 737131 in the postal address to ensure accurate sorting and on-time delivery by India Post.
| PIN Code | 737131 |
| Zone | Zone 7 · Eastern India |
| Sort District | 737 |
| Delivery Code | 131 |
| Postal Circle | West Bengal Circle |
| State / UT | Sikkim |
Browse PIN codes for other post offices in EAST SIKKIM, Sikkim