On May 1, 1826, Alexander Thomson (J) of Pennsylvania's 13th district resigned.[1] A special election was held to fill the resulting vacancy on October 10, 1826, the same day as the general elections to the 20th Congress.
- ^ "Nineteenth Congress March 4, 1825, to March 3, 1827" (PDF). Office of the Historian, United States House of Representatives. Archived from the original (PDF) on March 9, 2013. Retrieved March 13, 2022. footnote 49