 For 1990, North Potomac began being listed by the Census Bureau as a census-designated place, but census records show no data for 1980.The last major farm in the area is the Hanson Farm, and work began in 2009 for approval to build single-family homes on the farmland.The historic DuFief Mill site is located near the intersection of Turkey Foot Road and the Muddy Branch in Muddy Branch Regional Park.