| Place | Post Code |
|---|---|
| K. Kuchipalayam, Ulundurpettai | 606102 |
| K. Natham, Ulundurpettai | 606102 |
| K. Palayam, Ulundurpettai | 605751 |
| K. Thotti, Ulundurpettai | 606102 |
| Kalamarudur, Ulundurpettai | 606102 |
| Kalathur, Ulundurpettai | 607204 |
| Kalavanur, Ulundurpettai | 606102 |
| Kallamedu, Ulundurpettai | 607204 |
| Kamaraj Nagar, Ulundurpettai | 606102 |
| Kamatchipettai, Ulundurpettai | 607204 |
| Kampattu, Ulundurpettai | 606107 |
| Kandalavadi, Ulundurpettai | 607107 |
| Kannarampattu, Ulundurpettai | 607203 |
| Karadipakkam, Ulundurpettai | 607107 |
| Karapattu, Ulundurpettai | 607107 |
| Karuveppilaipalayam, Ulundurpettai | 607204 |
| Kattu Edaiyur, Ulundurpettai | 605751 |
| Kattuedayar Colony, Ulundurpettai | 605751 |
| Kattunemili, Ulundurpettai | 606104 |
| Kattusellur, Ulundurpettai | 605751 |
| Keelakuppam Velur, Ulundurpettai | 606102 |
| Kilapalayam, Ulundurpettai | 606102 |
| Kiliyur, Ulundurpettai | 606102 |
| Kilthaniyalampattu, Ulundurpettai | 607101 |
| Kizakkumarudur, Ulundurpettai | 607204 |
| Kobulapuram, Ulundurpettai | 607209 |