DELIVERY POST OFFICES OF TAMILNADU
1. OCHERI - 632531.
2. ODAIPATTI - 625540.
3. ODAYAPATTI - 636140.
4. ODDANCHATRAM - 624619.
5. ODUGATHUR - 632103.
6. OKKANAD KILAIYUR - 614632.
7. OKKARAI - 621022.
8. OKKUR - 630557.
9. OLAGADAM - 638314.
10. OLAKKUR - 604305.
11. OLD PALLAVARAM - 600117.
12. OMALUR - 636455.
13. ONDIKADAI - 636602.
14. ONDIPUDUR - 641016.
15. ONNUPURAM - 632315.
16. OOMANGALAM - 607804.
17. OOMERABD - 635808.
18. ORAKKATTU PETTAI - 603106.
19. ORATHI - 603307.
20. ORATHUR - 608201.
21. ORATHANAD - 614625.
22. ORNANCE ESTATE (TRY) - 620016.
23. ORIYUR - 623309.
24. OTTAPIDARAM - 628401.
25. OTHAKADAI - 625107.
26.OTHAKALMANDAPAM - 641032.
27. OTTANATHAM - 628302.
28. OTTANGADU - 614803.
29. OTTUPATTARAI - 643105.
30. O. SIRUVAYAL - 630208.