 grugan township is a township in clinton county, pennsylvania, united states. the population was 52 at the 2000 census. ==history== the township was formed in 1851 and was taken from territory in colebrook township and chapman township. the township is divided into two nearly equal parts by the west branch susquehanna river. the township is named for the descendants of charles grogan later written as "grugan", an irish immigrant and american revolution veteran from lancaster county. charles froze to death in the buffalo valley region during the winter of 1790-1791 and his sons, james and alexander grugan, later reared large families in what became grugan township. the earliest known settlers of the region were john baker atkin and james burney. the first school in grugan township was opened in 1830. ==geography== according to the united states census bureau, the township has a total area of , of which, {{convert|68.3|sqmi|
Populated_places_established_in_1785 Townships_in_Clinton_County,_Pennsylvania Townships_in_Pennsylvania