8 PIN codes
| PIN code | Post offices | Taluk / tehsil |
|---|---|---|
| 609601 | Ambagarathur S.O, Nallambal B.O, Seithur B.O | – |
| 609602 | Karaikal Bazaar S.O, Karaikal S.O, Karaikal South S.O and 2 more | – |
| 609603 | Nedungadu S.O, Kurumbagaram B.O, Melakasakudi B.O and 1 more | – |
| 609604 | Neravy S.O, Akkaraivattam B.O | – |
| 609605 | Thalatheru S.O, Karaikalmedu B.O, Karaikoilpathu B.O | – |
| 609606 | Tirumalairayanpattinam S.O, T.R.Pattinam South B.O | – |
| 609607 | Tirunallar S.O, Karukkangudi B.O, Sellur B.O and 2 more | – |
| 609609 | Kottuchery S.O, Tiruvettakudi B.O, Varichikudi B.O | – |