The percentage of children in poverty is the share of children under age 18 who live in families with incomes below the U.S. poverty threshold as defined by the U.S. Census Bureau.
(1990) U.S. Census Bureau. Census of Population and Housing, 1990: Summary Tape File 3C, (Table P117): Prepared by the U.S. Census Bureau, Washington (WV University Office of Health Services Research), 1992. (2000 to present) For both state and county poverty estimates: U.S. Census Bureau, Small Area Income and Poverty Estimates program, data accessed online at http://www.census.gov/cgi-bin/saipe/saipe.cgi.
Since the 1999 Data Book, we have used information from the Small Area Income and Poverty Estimates (SAIPE) series of the U.S. Census Bureau which provides state and county-level estimates of income and poverty.