| No. | Name | Type | Language | Counties |
|---|---|---|---|---|
| 0 | Diane Lynn Olney | Community | English | Washington |
| 0 | EUNICE BEVERLY OLSON | Standardized | English | Jackson, Josephine |
| 0 | Laura Ann Olson | Master | English | Clackamas, Marion, Multnomah, Polk, Yamhill |
| 0 | LINDA OLSON | Standardized | English | Umatilla |
| 20 | Kim (Kiki) Omoto | Master | English | Benton |
| 1 | LISSET ONEILL | Community | English, Spanish | Multnomah |
| 1 | Nancy L Orem | Master | English | All |
| 1 | RAUL DAVID OROZCO FUENTES | Master | English, Spanish | Benton, Linn, Marion, Polk |
| 0 | ANA LAURA ORTEGA | Standardized | Hood River, Wasco | |
| 0 | Kay Guadalupe Ortega | Standardized | English, Spanish | Jackson, Jefferson, Josephine, Klamath |