Johnsonburg is a borough in Elk County, Pennsylvania, 124 miles (199 km) northeast of Pittsburgh and 115 miles (185 km) south of Buffalo, New York, in a productive farming and lumbering region. Paper mills were once common here, and Domtar still maintains a paper mill there today. In 1910, 4,334 people lived here. The population was 3,003 at the 2000 census. It was founded in 1810 and incorporated in 1891.