Post offices and branch post offices present in Karaikal district of Pondicherry state. There are 27 Post Offices located in the district. List of Pin code of all the places in Karaikal is listed below.
| Post Office | Taluk | District | PIN Code |
|---|---|---|---|
| Akkaraivattam B.O | Neravy Commune Panchayat | Karaikal | 609604 |
| Ambagarathur S.O | Karaikal | Karaikal | 609601 |
| Dharmapuram B.O | NA | Karaikal | 609602 |
| Karaikal Bazaar S.O | NA | Karaikal | 609602 |
| Karaikal S.O | NA | Karaikal | 609602 |
| Karaikal South S.O | NA | Karaikal | 609602 |
| Karaikalmedu B.O | NA | Karaikal | 609605 |
| Karaikoilpathu B.O | NA | Karaikal | 609605 |
| Karukkangudi B.O | Thirunallar Commune Panchayat | Karaikal | 609607 |
| Kottuchery S.O | Kottucherry Commune Panchayat | Karaikal | 609609 |
| Kurumbagaram B.O | Nedungadu Commune Panchayat | Karaikal | 609603 |
| Madagadi B.O | NA | Karaikal | 609602 |
| Melakasakudi B.O | Nedungadu Commune Panchayat | Karaikal | 609603 |
| Nallambal B.O | Thirunallar Commune Panchayat | Karaikal | 609601 |
| Nallathur B.O | Nedungadu Commune Panchayat | Karaikal | 609603 |
| Nedungadu S.O | Karaikal | Karaikal | 609603 |
| Neravy S.O | Neravy Commune Panchayat | Karaikal | 609604 |
| Seithur B.O | Karaikal | Karaikal | 609601 |
| Sellur B.O | Thirunallar Commune Panchayat | Karaikal | 609607 |
| Surakudi B.O | Thirunallar Commune Panchayat | Karaikal | 609607 |
| T.R.Pattinam South B.O | Thirumalairayan Pattinam Commune Panchayat | Karaikal | 609606 |
| Thalatheru S.O | NA | Karaikal | 609605 |
| Tirumalairayanpattinam S.O | Karaikal | Karaikal | 609606 |
| Tirunallar S.O | Karaikal | Karaikal | 609607 |
| Tiruvettakudi B.O | Kottucherry Commune Panchayat | Karaikal | 609609 |
| Varichikudi B.O | Kottucherry Commune Panchayat | Karaikal | 609609 |
| Vizhithiyur B.O | Neravy Commune Panchayat | Karaikal | 609607 |