| No. | Name | Type | Language | Counties |
|---|---|---|---|---|
| 0 | Stacia Ann Clark | Master | English, Spanish | All |
| 0 | Tamara Dawn Clark | Master | English | Benton, Clackamas, Douglas, Lane, Lincoln, Linn, Marion, Multnomah, Polk, Washington, Yamhill |
| 10 | MYRA MIHELICH CLASSEN | Master | English | Benton, Clackamas, Columbia, Hood River, Lane, Lincoln, Linn, Marion, Multnomah, Polk, Tillamook, Washington, Yamhill |
| 1 | MOLLY CLEMENT | Master | English | Jackson, Josephine |
| 0 | JUDY CLIFFORD | Standardized | English | Washington |
| 0 | Kendra Janine Coates | Master | English | All |
| 3 | DEBORAH P. COEHLO | Master | English | All |
| 0 | ANDREA COFFEE | Community | English | Lane |
| 0 | CHRISTINA COFFEY | Standardized | Benton, Linn, Marion, Polk, Yamhill | |
| 0 | ELISABETH MENZEL COHEN | Standardized | English | Coos, Curry |
| 0 | TONYA COKER | Master | English | All |
| 0 | NELL COLBURN | Standardized | English | Multnomah |
| 0 | Anna Marin Cole | Standardized | English | Coos, Curry |
| 0 | SHARON JOYCE COLE | Standardized | English | Tillamook |
| 0 | BRANDY COLEMAN | Master | English | All |
| 3 | PILAR ELENA COLLAZO | Master | English, Spanish | Clackamas, Hood River, Multnomah, Washington |
| 3 | MELINDA ROSE COLLIER | Master | English | Klamath, Lake |
| 0 | Andrea Maria Collins | Master | English | Grant, Morrow, Umatilla, Union |
| 0 | EMILY SUSAN COLLINS | Standardized | English | All |
| 0 | Lori Colvin | Master | English | Crook, Deschutes, Jefferson, Klamath, Lake |