There are 5 US Post Offices in Forest County serving a total of 8,137 residents equating to 1,627 residents per post office. It's estimated that approximately 12,988 packages are handled across the 5 county post offices annually. Forest County is a county located in Western Pennsylvania. As of the 2010 census, the population was 7,716, 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."