the highest population of any municipality (30,706 or 25.6% of the county total as of 2000), while Brown Township in the northwest corner of the county has the lowest population (111 or 0.092%). Most of the county's population is in the valley along the West Branch Susquehanna River. Former townships The territory which today makes up Lycoming County was purchased from the Iroquois in two treaties signed at Fort Stanwix in New York: the first treaty was in 1768, and the second treaty was in 1784. The county was formed on April 13, 1795 from part of Northumberland County. The county originally contained seven townships when formed: Lower Bald Eagle, Loyalsock, Lycoming, Muncy, Nippenose, Pine Creek, and Washington. Today Pine Creek is part of Clinton County and Lower Bald Eagle is part of both Centre and Clinton counties, but the rest are still in Lycoming County, although many other municipalities have been formed from these since. When originally formed in 1795, Lycoming County was "roughly estimated at about 12,000 square miles" (31,000 km2). Its territory stretched north to the New York state line, west to the Allegheny River, south nearly to the source of the West Branch Susquehanna River, and east to include modern Sullivan County and a bit beyond. However, by 1800, just five years after its formation, the first territory was taken from it to form new counties, a process that continued until 1847. Twenty other Pennsylvania counties today contain land that was once part of Lycoming County: five were formed completely from it (Jefferson, McKean, Potter, Tioga, and Sullivan), eight were formed from it and other counties (Armstrong, Bradford, Centre, Clearfield, Clinton, Indiana, Venango, and Warren), three were formed from counties that were themselves formed partly from it (Cameron, Clarion, and Elk), Forest was formed from a county that was formed completely from it, two (Luzerne and Wyoming) contain territory that was part of lycoming County in 1795, and finally Union received a township from it in 1861. The second table lists each of the twenty two known former incorporated areas in the county, and information on the modern township successors of these today. Note that former townships are only known for nine of the twenty counties containing land from Lycoming. Clickable map The map shown below is clickable; click on any municipality label to be redirected to the article for that city, borough or township. See