USA Regional Finalists for Mathematics in 2019 YHSA
Congratulations to the following students who will enter the final at Tsinghua University in Beijing, China.
| School Name | Student Group | Instructor | Paper Title |
| Choate Rosemary Hall | Ziyan Lei | Shuliang Bai | Ricci-flat 5-regular graphs |
| Westminster School | Michelle Wu | Steve Miller | Biases in First and Second Moments of the Fourier Coefficients in One- and Two-Parameter Families of Elliptic Curves |
| The Roxbury Latin School | Christopher Zhu | Pakawut Jiradilok | Enumerating Permutations and Rim Hooks Characterized by Double Descent Sets |