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PIN code 631211 is the Postal Index Number assigned to the Karthikeyapuram B.O post office in TIRUVALLUR district, Tamil Nadu. It is administered under the Tamilnadu Circle Postal Circle. The code falls under Zone 6 of India's postal network, covering the Southern 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 (6) identifies the broad postal zone; the first three digits (631) pinpoint the postal district or sorting hub; and the last three digits (211) identify the specific delivery post office.
When addressing letters, parcels, or courier shipments to Karthikeyapuram B.O in TIRUVALLUR, Tamil Nadu, always include PIN – 631211 in the postal address to ensure accurate sorting and on-time delivery by India Post.
| PIN Code | 631211 |
| Zone | Zone 6 · Southern India |
| Sort District | 631 |
| Delivery Code | 211 |
| Postal Circle | Tamilnadu Circle |
| State / UT | Tamil Nadu |
Browse PIN codes for other post offices in TIRUVALLUR, Tamil Nadu