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PIN code 400020 is the Postal Index Number assigned to the Central Building SO post office in MUMBAI district, Maharashtra. It is administered under the Maharashtra Circle Postal Circle. The code falls under Zone 4 of India's postal network, covering the Western 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 (4) identifies the broad postal zone; the first three digits (400) pinpoint the postal district or sorting hub; and the last three digits (020) identify the specific delivery post office.
When addressing letters, parcels, or courier shipments to Central Building SO in MUMBAI, Maharashtra, always include PIN – 400020 in the postal address to ensure accurate sorting and on-time delivery by India Post.
| PIN Code | 400020 |
| Zone | Zone 4 · Western India |
| Sort District | 400 |
| Delivery Code | 020 |
| Postal Circle | Maharashtra Circle |
| State / UT | Maharashtra |
Browse PIN codes for other post offices in MUMBAI, Maharashtra