Administration
The district is subdivided into 7 subdistricts (tambon), which are further subdivided into 68 villages (muban). Sai Noi itself has subdistrict municipality status (thesaban tambon) which covers parts of tambon Sai Noi and Khlong Khwang. There are further 7 Tambon administrative organizations (TAO).
| No. | Name | Thai | Villages | Inh. |
|---|---|---|---|---|
| 1. | Sai Noi | ไทรน้อย | 11 | 19,088 |
| 2. | Rat Niyom | ราษฎร์นิยม | 08 | 06,223 |
| 3. | Nong Phrao Ngai | หนองเพรางาย | 12 | 06,664 |
| 4. | Sai Yai | ไทรใหญ่ | 11 | 06,260 |
| 5. | Khun Si | ขุนศรี | 08 | 04,740 |
| 6. | Khlong Khwang | คลองขวาง | 10 | 05,413 |
| 7. | Thawi Watthana | ทวีวัฒนา | 08 | 06,612 |
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