Simpson is an unincorporated community and census-designated place in Fell Township, Lackawanna County, Pennsylvania, United States. It is directly north of the city of Carbondale on Pennsylvania Route 171. As of the 2010 census the population of Simpson was 1,275.Simpson was settled in 1818 and organized in 1845. It is named after Clarence D. Simpson, who was one of the large independent coal magnates in the Northern Anthracite Region.