| Place | Post Code |
|---|---|
| Othivakkam, Chengalpattu | 603202 |
| Othivakkam R.F, Chengalpattu | 603405 |
| Otteri, Chengalpattu | 603109, 603108, 600048 |
| Ottiambakkam, Chengalpattu | 600126 |
| Ozhalur, Chengalpattu | 603111 |
| Padervadi, Chengalpattu | 602105 |
| Padur, Chengalpattu | 603103 |
| Panangathupakkam, Chengalpattu | 600127 |
| Panangottur, Chengalpattu | 603209 |
| Panchanthiruthy, Chengalpattu | 603105 |
| Paranur, Chengalpattu | 603002 |
| Paranur R.F, Chengalpattu | 603002 |
| Pattaravakkam, Chengalpattu | 603003 |
| Pattipulam, Chengalpattu | 603104 |
| Pazhaveli, Chengalpattu | 603111 |
| Peria Irumbedu, Chengalpattu | 603105 |
| Periyaputheri, Chengalpattu | 603108 |
| Periyavippedu, Chengalpattu | 603109 |
| Perumalthangal, Chengalpattu | 603204 |
| Perumathunallur, Chengalpattu | 603202 |
| Perunthandalam, Chengalpattu | 603108 |
| Polacheri, Chengalpattu | 600127 |
| Ponmar, Chengalpattu | 600127 |
| Pooluppai, Chengalpattu | 603108 |
| Poondi, Chengalpattu | 603105 |
| Poranthavakkam, Chengalpattu | 603105 |