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PIN code 804421 is the Postal Index Number assigned to the Aira BO post office in GAYA district, Bihar. It is administered under the Bihar Circle Postal Circle. The code falls under Zone 8 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 (8) identifies the broad postal zone; the first three digits (804) pinpoint the postal district or sorting hub; and the last three digits (421) identify the specific delivery post office.
When addressing letters, parcels, or courier shipments to Aira BO in GAYA, Bihar, always include PIN – 804421 in the postal address to ensure accurate sorting and on-time delivery by India Post.
| PIN Code | 804421 |
| Zone | Zone 8 · Eastern India |
| Sort District | 804 |
| Delivery Code | 421 |
| Postal Circle | Bihar Circle |
| State / UT | Bihar |
Browse PIN codes for other post offices in GAYA, Bihar