During the 15th Congress, there were two special elections in the 6th district of Pennsylvania, both held in the year 1818. The 6th district at that time was a plural district with two seats, both of which became vacant at different times in 1818. The first vacancy was caused by John Ross (DR) resigning on February 24, 1818 and the second was caused by Samuel D. Ingham (DR) resigning July 6.
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March election
The first election, to fill the vacancy left by Ross' resignation, was held March 3.
Rogers took his seat March 24, during the First Session
October election
The second election, to fill the vacancy left by Ingham's resignation, was held October 13, the same time as the elections for the 16th Congress
Moore ran unopposed and took his seat November 16, at the start of the Second Session of the 15th Congress.