Annual Intercensal Resident Population Estimates by Age Group, Sex, Race, and Hispanic Origin for the United States, States, and Counties, and by Age Group and Sex for Puerto Rico Commonwealth and Its Municipios: April 1, 2000 to April 1, 2010 // Source: U.S. Census Bureau, Population Division // Note: 'In combination' means in combination with one or more other races. The sum of the five race-in-combination groups adds to more than the total population because individuals may report more than one race. Hispanic origin is considered an ethnicity, not a race. Hispanics may be of any race. Responses of 'Some Other Race' from the 2000 and 2010 Censuses are modified. This results in differences between the population for specific race categories shown for the 2000 and 2010 Census populations in this file versus those in original 2000 and 2010 Census data. For more information, see http://www.census.gov/popest/research/modified.html. // The April 1, 2000 Population Estimates base reflects changes to the Census 2000 population from the Count Question Resolution program and geographic program revisions. // For detailed information about the methods used to create the intercensal estimates, see http://www.census.gov/popest/methodology/index.html. // The intercensal estimates for 2000-2010 for the United States and Puerto Rico populations are produced by the Census Bureau's Population Estimates Program by modifying the 2000-2010 postcensal estimates prepared previously for the United States and Puerto Rico, to account for differences between the postcensal estimates for April 1, 2010 and the 2010 Census counts. The reference date for all estimates is July 1, unless otherwise specified. The Population Estimates Program provides additional information including historical and current estimates, evaluation estimates, demographic analysis, and research papers on its website: http://www.census.gov/popest/index.html