| Place | Post Code |
|---|---|
| Aaliyaru, Chengam | 606707 |
| Agaram, Chengam | 606707 |
| Aiythapalayam, Chengam | 606706 |
| Alaputhur, Chengam | 606710 |
| Alathiammanur, Chengam | 606708 |
| Alliandal, Chengam | 606705 |
| Amantha Puthur, Chengam | 606707 |
| Ammapalayam, Chengam | 606704 |
| Ammiyandal, Chengam | 606705 |
| Anaikattu, Chengam | 606708 |
| Anandavadi, Chengam | 606703 |
| Andanur, Chengam | 606709 |
| Andapettai, Chengam | 606709 |
| Andipattu, Chengam | 606703 |
| Andithangal, Chengam | 606702 |
| Anna Nagar, Chengam | 606710 |
| Annamalai Kottai, Chengam | 606704 |
| Annamalai Nagar, Chengam | 606702 |
| Annandal, Chengam | 606704 |
| Anthoniyarpuram, Chengam | 606753 |
| Anwarabath, Chengam | 606705 |
| Arasampet, Chengam | 606707 |
| Arasankanni, Chengam | 606703 |
| Arasanthangal, Chengam | 606702 |
| Arasanur, Chengam | 606710 |
| Arattavadi, Chengam | 606709 |