Kalasamudram BO is the primary post office registered under PIN code 632311 in Tiruvannamalai, Tamil Nadu. This code sits within the Southern Postal Region, with 6 offices operating under it.
| Post office | Type | Full name |
|---|---|---|
| Kalasamudram BO | BO | Branch Post Office |
| Kuppam BO | BO | Branch Post Office |
| Kannamangalam Bazaar BO | BO | Branch Post Office |
| Kulathur BO | BO | Branch Post Office |
| Vallam Kannamangalam BO | BO | Branch Post Office |
| Kannamangalam SO | SO | Sub Post Office |
