 About 3.2% of families and 5.3% of the population were below the poverty line, including 7.6% of those under age 18 and 6.5% of those age 65 or over.Even though the county seat is in Upper Marlboro, multiple agencies of the Government of Prince George's County, including the majority of the county's executive branch, reside in Largo.In the 1990s the PG County government purchased some properties and leased others, and county administrative functions were moved to Largo.