| # | Office Holder | Party | Tenure |
|---|---|---|---|
| 1 | James M. Plaskett | Democratic | Nov 9, 1966 to Nov 8, 1972 |
| 2 | Joan Margaret Barton Gubbins | Republican | Nov 8, 1972 to Nov 5, 1980 |
| 3 | Virginia Mabel Murphy Bauerle Blankenbaker | Republican | Nov 5, 1980 to Nov 4, 1992 |
| 4 | Teresa Lubbers | Republican | Nov 4, 1992 to Jul 2, 2009 |
| Vacant | Jul 2, 2009 to Jul 21, 2009 | ||
| 5 | Scott Schneider | Republican | Jul 21, 2009 to Nov 9, 2016 |
| 6 | John C. Ruckelshaus | Republican | Nov 9, 2016 to Nov 4, 2020 |
| 7 | Fady Qaddoura | Democratic | Nov 4, 2020 to Present |