Clarks Summit is a borough in Lackawanna County northwest of Scranton in northeastern Pennsylvania, United States. The population was 5,116 at the 2010 census. It is also the northern terminus of the Pennsylvania Turnpike Northeast Extension, I-476.
The first settler in the area currently known as Clarks Summit was William Clark. Clark had fought in the Battle of Bunker Hill during the Revolutionary War, and as payment for his military service, he was issued 800 acres (3.2 km2) of Pennsylvania land by Congress. Because of disputes between Pennsylvania and Connecticut over the area of land that is now northern Pennsylvania (resulting in the Pennamite-Yankee War), the land deed issued to Clark was deemed invalid by the Luzerne County land grant office. Clark had no choice but to pay for the land himself. In March 1799, Clark and his three sons moved into a log cabin in the Abington wilderness, located on what is currently the Clarks Green Cemetery. The first school was built in 1893 and was destroyed by fire two years later. The village of Clarks Summit and an adjacent tract of land were incorporated into the Borough of Clarks Summit on August 30, 1911.