| Name | Type | Language | Counties |
|---|---|---|---|
| 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 |
| ELIZABETH ANN OLSON | Standardized | ||
| EUNICE BEVERLY OLSON | Standardized | English | Jackson, Josephine |
| Laura Ann Olson | Master | English | Clackamas, Marion, Multnomah, Polk, Yamhill |
| LINDA OLSON | Standardized | English | Umatilla |
| Kim (Kiki) Omoto | Master | English | Benton |