| Name | Type | Language | Counties |
|---|---|---|---|
| LEA KELLY NUNAMAKER | Master | English | All |
| Ariana G Nunez-Gastelum | Community | English, Spanish | Malheur |
| DEAN NUNNEMAKER | Standardized | English | Josephine |
| Lisa Ann O'Connor | Master | English | Gilliam, Hood River, Sherman, Wasco, Wheeler |
| Jill Marie O'Donnell | Master | English | Douglas, Jackson, Josephine, Klamath, Lake |
| Frank Thomas O'Hearn | Standardized | All | |
| ERIN JEAN O'REGAN | Master | English | Multnomah |
| Amie O'Rourke | Master | English | Benton, Linn |
| Kimberly Diane O'Shaughnessy | Community | English | Crook, Deschutes, Jefferson, Klamath |
| HENRY OBELNICKI | Master | English | Clatsop, Columbia, Hood River, Lincoln, Multnomah, Washington |
| EZELMA ANN OBUHORO | Master | English | Multnomah, Washington |
| RUTH (Noemí) NOEMI OCHOA | Master | English, Spanish | All |
| TRISTA MICHELLE OCHOA | Master | All | |
| WHITNEY OCONNELL | Community | English | All |
| CATHERINE ANN OEHLER | Master | English | Clackamas, Multnomah, Washington |
| Soobin David Oh | Master | English | All |
| HEATHER OLEARY | Master | English | All |
| Katherine Elaine Olinger | Master | English | All |
| Yamel Olivas Solis | Standardized | Spanish | Clackamas, Multnomah, Washington, Yamhill |
| Diane Lynn Olney | Community | English | Washington |