Clarks Summit is a borough in Lackawanna County, northwest of Scranton in Northeastern Pennsylvania. The population was 5,108 at the 2020 census. It is also the northern control city of the Pennsylvania Turnpike Northeast Extension, I-476, though the official terminus is in adjacent South Abington Township.

Lackawanna County is a county in the Commonwealth of Pennsylvania. It is located in Northeastern Pennsylvania and had a population of 215,615 (2022). Its county seat and most populous city is Scranton. The county is part of the Northeast Pennsylvania region of the state.