Number - population by child and adult categories.
Percent - share of the population belonging to the child or adult categories.
Data for 1980, 1990, and 2000 reflect official Census counts from April 1 of the stated year, while data for 2001-2016 reflect population estimates for July 1 of the stated year. Data presented for 2001 through 2009 are Vintage 2009 population estimates. Data presented for 2010-2016 are Vintage 2016 population estimates. Each year the U.S. Census Bureau revises their post-2010 estimates. Therefore, data presented here may differ from previously published estimates.
Population Division, U.S. Census Bureau.
1980: U.S. Census Bureau; Census 1980, Summary Tape File 1, extracted from National Historical Geographic Information System, 1990: U.S. Census Bureau; Census 1990, Summary File 1, extracted from National Historical Geographic Information System, 2000: U.S. Census Bureau; Census 2000, Summary File 1, extracted from American Fact Finder, 2001-2009: Population Estimates Program, Population Division, U.S. Census Bureau Washington D.C. Release Date: June 2010, available at http://www.census.gov/popest/, 2010-2016: National Center for Health Statistics. Vintage 2016 postcensal estimates of the resident population of the United States (April 1, 2010, July 1, 2010-July 1, 2016), by year, county, single-year of age (0, 1, 2, .., 85 years and over), bridged race, Hispanic origin, and sex. Prepared under a collaborative arrangement with the U.S. Census Bureau. Available from: http://www.cdc.gov/nchs/nvss/bridged_race.htm, following release by the U.S. Census Bureau of the unbridged Vintage 2016 postcensal estimates by 5-year age group on June 26, 2017.