He started a law practice in West Chester. He was a member of the Pennsylvania House of Representatives, representing Chester County from 1807 to 1808. He was elected again in a special election in February 1816 to fill a vacancy. He served as a lieutenant and adjutant of the Second Regiment, Pennsylvania Volunteers in 1814 and 1815.[1][2]
Darlington was elected as a Federalist to the Fifteenth congress. He declined to be a candidate for renomination in 1818 to the Sixteenth congress. He served from March 4, 1817, to March 3, 1819.[1]
Darlington was appointed deputy attorney general for Chester County, Pennsylvania in 1820 and became presiding judge of the judicial district comprising the counties of Chester and Delaware from May 1821 until his death.[1][2]
Personal life
Darlington died at his home in West Chester on April 27, 1839. He was interred in the Friends Burying Ground in Birmingham.[1][2][3]