Forest County is a county located in the U.S. state of Pennsylvania. As of 2010, the population is 7,716. Forest County is famous as a rural retreat. Nearly 75% of all dwellings in the county are second or vacation homes http://www. post-gazette. com/pg/04256/377610. stm. Forest County does not have a single traffic light, the only county in the state with such a distinction. http://pavisnet.