PIN code 631203 belongs to Kaivandur B.O (Branch Post Office), located in Thiruvallur district, Tamil Nadu. It falls under the Southern Postal Region and is served by 10 post offices in total.
| Post office | Type | Full name |
|---|---|---|
| Kaivandur B.O | BO | Branch Post Office |
| Pattaraiperumbudur B.O | BO | Branch Post Office |
| Senji B.O | BO | Branch Post Office |
| Tirupasur B.O | BO | Branch Post Office |
| Kadambathur S.O | SO | Sub Post Office |
| Pandur B.O | BO | Branch Post Office |
| Egattur B.O | BO | Branch Post Office |
| Pudumavilangai B.O | BO | Branch Post Office |
| Vidaiyur B.O | BO | Branch Post Office |
| Selai B.O | BO | Branch Post Office |
