Persistent Poverty Counties — The Economic Research Service (ERS) of USDA categorizes non-metropolitan counties by their dominant economic foundation and by characteristic policy type. Persistent poverty counties are defined as those where 20% or more of the county population in each of the last four decennial Censuses had poverty level household incomes[1]. In 2000, there were 386 such counties concentrated largely in the Delta South, Central Appalachia, Rio Grande Valley, the Northern Great Plains, and western Alaska. The average poverty rate in these counties was approximately 29% in 1989.