A special election was held in Pennsylvania's 3rd congressional district on October 11, 1814 to fill a vacancy caused by the resignation of James Whitehill (DR) on September 1, 1814. This was the second resignation from the 3rd district in the 13th congress, the previous resignation having been in the previous year.
Election results
Slaymaker took his seat on December 12, 1814
References
Pennsylvania's 3rd congressional district special election, 1814 Wikipedia(Text) CC BY-SA