Background
William P. Maclay (son of Samuel Maclay and nephew of William Maclay) was born in Northumberland County, Pennsylvania.
William P. Maclay (son of Samuel Maclay and nephew of William Maclay) was born in Northumberland County, Pennsylvania.
Maclay was elected as a Democratic-Republican to the Fourteenth Congress to fill the vacancy caused by the resignation of Thomas Burnside. He was reelected to the Fifteenth and Sixteenth Congresses. He was not a candidate for renomination in 1820.
He was later engaged as a surveyor and in agricultural pursuits.
He died in Milroy, Pennsylvania, in 1842.
He was prothonotary of Mifflin County, Pennsylvania, from 1808 to 1814, and a member of the Pennsylvania House of Representatives. He was a member of the State convention to alter and amend the constitution at Harrisburg, Pennsylvania, in 1837.