| Place | Post Code |
|---|---|
| Reddipalayam, Ulundurpettai | 607204 |
| Salapakkam, Ulundurpettai | 607202 |
| Samathuvapuram, Ulundurpettai | 607107 |
| Saravanapakkam, Ulundurpettai | 607209 |
| Saravanapakkam X Road, Ulundurpettai | 607209 |
| Sarayamedu, Ulundurpettai | 607203 |
| Saveriyarpuram, Ulundurpettai | 606205 |
| Seedevi, Ulundurpettai | 606205 |
| Semangalam, Ulundurpettai | 607101 |
| Sembiamadevi, Ulundurpettai | 607202 |
| Semmanandal, Ulundurpettai | 607204 |
| Semmanangur, Ulundurpettai | 606107 |
| Semmar, Ulundurpettai | 607107 |
| Sendamangalam, Ulundurpettai | 607204 |
| Sendanadu, Ulundurpettai | 607204 |
| Senjikkuppam, Ulundurpettai | 607204 |
| Senkurichi, Ulundurpettai | 606115 |
| Shaik Hussainpet, Ulundurpettai | 606104 |