| 2001 | | Bangkok | placement.2RU |
| 2002 | | Bangkok | page.geo_unit_pageant.unplaced |
| 2002 | | Bangkok | page.geo_unit_pageant.unplaced |
| 2002 | | Bangkok | page.geo_unit_pageant.unplaced |
| 2011 | | Bangkok | placement.WINNER |
| 2011 | | Bangkok | page.geo_unit_pageant.unplaced |
| 2013 | | Bangkok | placement.1RU |
| 2014 | | Bangkok | page.geo_unit_pageant.unplaced |
| 2015 | | Bangkok | placement.SEMIFINALIST |
| 2015 | | Bangkok | page.geo_unit_pageant.unplaced |
| 2016 | | Bangkok | placement.SEMIFINALIST |
| 2016 | | Bangkok | page.geo_unit_pageant.unplaced |
| 2016 | | Bangkok | page.geo_unit_pageant.unplaced |
| 2017 | | Bangkok | page.geo_unit_pageant.unplaced |
| 2017 | | Bangkok | placement.SEMIFINALIST |
| 2018 | | Bangkok | page.geo_unit_pageant.unplaced |
| 2021 | | Pattaya | placement.SEMIFINALIST |
| 2023 | | Nonthaburi | placement.QUARTERFINALIST |
| 2024 | | Bangkok | placement.QUARTERFINALIST |
| 2025 | | Bangkok | page.geo_unit_pageant.unplaced |