This data product provides poverty area measures for counties and census tracts across the 50 States and Washington DC. The measures include indicators of high poverty areas, extreme poverty areas, persistent poverty areas, and enduring poverty areas for Decennial Census years 1960–2000 and for American Community Survey (ACS) 5-year periods spanning 2007–11, 2015–19, and 2017–21. This product uses county-level data from the U.S. Department of Commerce, Bureau of the Census, 1960, 1970, 1980, 1990, and 2000 Decennial Censuses and American Community Survey (ACS) 5-year period estimates for 2007–11, 2015–19, and 2017–21. Data for census tracts include the same data sources and years except for 1960 (because of the limited number of defined census tracts in that year of data collection) and 2017–21. Poverty rates for census tracts in the years before 2007–11 are calculated using data from Geolytics’ Neighborhood Change Database. The Neighborhood Change Database normalizes Decennial Census data to 2010 census-tract geographies allowing for better comparisons of census tract poverty rates over time. USDA, Economic Research Service (ERS) relies on poverty/population counts from these sources to derive poverty rates that are used to create the poverty area measures in this data product.