In Tirupati district, Andhra Pradesh, PIN code 517646 is anchored by Chilamathur B.O, a Branch Post Office. Mail addressed to this code is sorted through the Southern Postal Region, across 3 listed offices.
| Post office | Type | Full name |
|---|---|---|
| Chilamathur B.O | BO | Branch Post Office |
| Sricity S.E.Z SO | SO | Sub Post Office |
| Irugulam B.O | BO | Branch Post Office |
