Forest County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 6,973, making it the third-least populous county in Pennsylvania. Its county seat is Tionesta. The county was created in 1848 and later organized in 1857. The county is part of the North Central Pennsylvania region of the state.

Tionesta is a borough in and the county seat of Forest County, Pennsylvania, United States. The population was 475 at the 2020 Census. The name is a Native American word meaning "the home of the wolves". Visitors and residents are greeted to Tionesta with a sign reading "A special place with a relaxed pace"