| Name | Type | Language | Counties |
|---|---|---|---|
| CHRISTINA SUZANNE ONEILL | Master | English | All |
| LISSET ONEILL | Master | English, Spanish | Multnomah |
| Nancy L Orem | Master | English | All |
| RAUL DAVID OROZCO FUENTES | Master | English, Spanish | Benton, Linn, Marion, Polk |
| ANA LAURA ORTEGA | Standardized | Hood River, Wasco | |
| Kay Guadalupe Ortega | Standardized | English, Spanish | Jackson, Jefferson, Josephine, Klamath |
| MIRIAM NANCY ORTIZ VARGAS | Standardized | Crook, Deschutes, Jefferson | |
| ELENA ESMERALDA ORTIZ-ROBLES | Community | Spanish | Hood River, Multnomah, Wasco |
| WYNNE LOUISE OSBORNE | Community | English | Clackamas, Clatsop, Crook, Deschutes, Jefferson, Tillamook, Washington |
| CINDY RAE OVERSTREET | Master | English | Clackamas, Clatsop, Columbia, Multnomah, Washington |