| State, District |
Reason for Vacancy, Successor |
| California, 18th |
The Honorable Dennis Cardoza resigned on August 15, 2012. |
| Kentucky, 4th |
The Honorable Geoff Davis resigned on July 31, 2012. |
| Michigan, 11th |
The Honorable Thaddeus G. McCotter resigned on July 6, 2012. |
| Washington, 1st |
The Honorable Jay Inslee resigned on March 20, 2012. |
| New Jersey, 10th |
The Honorable Donald M. Payne passed away on March 6, 2012. |
| Arizona, 8th |
The Honorable Gabrielle Giffords resigned on January 25, 2012.
The Honorable Ron Barber (D-AZ) was elected June 12, 2012 in special election. Representative-elect Barber was added to the rolls of the House upon executing the oath of office on June 19, 2012. |
| Oregon, 1st |
The Honorable David Wu resigned on August 3, 2011.
The Honorable Suzanne Bonamici (D-OR) was elected January 31, 2012 in special election. Representative-elect Bonamici was added to the rolls of the House upon executing the oath of office on February 7, 2012. |
| State, District |
Reason for Vacancy, Successor |
| Oregon, 1st |
The Honorable David Wu resigned on August 3, 2011. |
| New York, 9th |
The Honorable Anthony D. Weiner resigned on June 21, 2011.
The Honorable Robert L. Turner (R-NY) was elected September 13, 2011 in special election. Representative-elect Turner was added to the rolls of the House upon executing the oath of office on September 15, 2011. |
| Nevada, 2nd |
The Honorable Dean Heller resigned on May 9, 2011.
The Honorable Mark E. Amodei (R-NV) was elected September 13, 2011 in special election. Representative-elect Amodei was added to the rolls of the House upon executing the oath of office on September 15, 2011. |
| California, 36th |
The Honorable Jane Harman resigned on February 28, 2011.
The Honorable Janice Hahn (D-CA) was elected July 12, 2011 in special election. Representative-elect Hahn was added to the rolls of the House upon executing the oath of office on July 19, 2011. |
| New York, 26th |
The Honorable Christopher John Lee resigned on February 9, 2011.
The Honorable Kathleen C. Hochul (D-NY) was elected May 24, 2011 in special election. Representative-elect Hochul was added to the rolls of the House upon executing the oath of office on June 1, 2011. |