Weiser State Forest is a Pennsylvania State Forest in Pennsylvania Bureau of Forestry District #18. The main offices are located in Cressona in Schuylkill County, Pennsylvania in the United States. The forest is located on several small tracts in Carbon, Columbia, Dauphin, Northumberland, and Schuylkill counties. District #18 also includes L…Weiser State Forest is a Pennsylvania State Forest in Pennsylvania Bureau of Forestry District #18. The main offices are located in Cressona in Schuylkill County, Pennsylvania in the United States. The forest is located on several small tracts in Carbon, Columbia, Dauphin, Northumberland, and Schuylkill counties. District #18 also includes Lebanon and Montour counties. The Appalachian Trail runs through the state forest lands.