In 2000, the Pennsylvania Department of Conservation's Natural Resources, Bureau of Forestry and the Northern Research Station's Forest Inventory and Analysis unit implemented a new annual system for inventorying and monitoring Pennsylvania's forests. This report includes data from 2000 to 2004. Pennsylvania's forest-land base is stable, covering 16.6 million acres or 58 percent of land area. More than 660,000 acres of forest land were lost from 1989 to 2004, mostly to residential or industrial development. However, there was a 617,500-acre gain in forest land, mostly from agricultural land. Fifty-four percent of forest land is owned by families and individuals.