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PIN code 173021 is the Postal Index Number assigned to the Kotribyas BO post office in SIRMAUR district, Himachal Pradesh. It is administered under the Himachal Pradesh Circle Postal Circle. The code falls under Zone 1 of India's postal network, covering the Northern 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 (1) identifies the broad postal zone; the first three digits (173) pinpoint the postal district or sorting hub; and the last three digits (021) identify the specific delivery post office.
When addressing letters, parcels, or courier shipments to Kotribyas BO in SIRMAUR, Himachal Pradesh, always include PIN – 173021 in the postal address to ensure accurate sorting and on-time delivery by India Post.
| PIN Code | 173021 |
| Zone | Zone 1 · Northern India |
| Sort District | 173 |
| Delivery Code | 021 |
| Postal Circle | Himachal Pradesh Circle |
| State / UT | Himachal Pradesh |
Browse PIN codes for other post offices in SIRMAUR, Himachal Pradesh