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is a borough in Lackawanna County, Pennsylvania, United States. The population was 5,126 at the 2000 census.
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 of Pennsylvania land by Congress. Due to disputes between Pennsylvania and Connecticut over the area of land that is now northern Pennsylvania, 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 of 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 village of Clarks Summit and an adjacent tract of land were incorporated into the Borough of Clarks Summit on August, 30, 1911. The first school was built in 1893 and was destroyed by fire two years later.