Susquehanna County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 38,434 Its county seat is Montrose. The county was created on February 21, 1810, from part of Luzerne County and later organized in 1812. It is named for the Susquehanna River. The county is part of the Northeast Pennsylvania region of the state.

Montrose is a borough in Susquehanna County, Pennsylvania, United States, 18.41 miles (29.63 km) south-southeast of Binghamton, New York and 31.39 miles (50.52 km) north by west of Scranton. The land is elevated approximately 1,400 feet (430 m) above sea level. It is the Susquehanna County seat.