| Place | Post Code |
|---|---|
| Agavalam, Arakonam | 631052 |
| Agavalam Mottur, Arakonam | 631052 |
| Akkachikuppam, Arakonam | 632510 |
| Alapakkam, Arakonam | 632508 |
| Allithangal, Arakonam | 632510 |
| Alliyappanthangal, Arakonam | 631003 |
| Amarapuram, Arakonam | 632531 |
| Amaravathipattinam, Arakonam | 632510 |
| Ambarishpuram, Arakonam | 631004 |
| Amirthavallipuram, Arakonam | 632510 |
| Ammanur, Arakonam | 631002 |
| Ammanur R.F, Arakonam | 631002 |
| Ampuram, Arakonam | 632009 |
| Anaikattaputhur, Arakonam | 631151 |
| Anaikattuputhur, Arakonam | 631151 |
| Anaipakkam, Arakonam | 631003 |
| Ananthapuram, Arakonam | 631151, 631003 |
| Ann Nagar, Arakonam | 632505 |
| Anverthikanpettai, Arakonam | 632502 |
| Appa Reddy Kandigai, Arakonam | 631051 |
| Arakkonam, Arakonam | 631001, 631002, 631003, 631004, 631005, 631006, 632502 |
| Arigilapadi, Arakonam | 631151 |
| Arigilpadi, Arakonam | 631151 |
| Ariyur, Arakonam | 631102 |
| Arumbakkam, Arakonam | 631002 |
| Arunthathi Colony, Arakonam | 632510 |