Sill was a member of the Pennsylvania House of Representatives in 1823. He was elected as an Adams candidate to the Nineteenth Congress to fill the vacancy caused by the death of Patrick Farrelly. He again served as burgess of Erie in 1829.
Sill served as a member of the Pennsylvania House of Representatives in 1823 and later filled a vacant seat in the Nineteenth Congress following Patrick Farrelly's death. He also held the position of burgess of Erie in 1829.