Monthly Intercensal Population Estimates for the United States: April 1, 2000 to April 1, 2010 // Source: U.S. Census Bureau, Population Division // Note: 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 https://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: https://www.census.gov/popest/index.html

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

Annual Population Estimates for the United States, States, Metropolitan Statistical Areas, Micropolitan Statistical Areas, Counties, Incorporated Places, and Minor Civil Divisions; and for Puerto Rico and Its Municipios // Source: U.S. Census Bureau, Population Division // The contents of this file are released on a rolling basis from December through May. // The estimates are developed from an April 1, 2020 base population and may incorporate changes resulting from the Count Question Resolution program and/or geographic program revisions. // The Office of Management and Budget's statistical area delineations for metropolitan, micropolitan, and combined statistical areas, as well as metropolitan divisions, are those issued by that agency. // Current data on births, deaths, and migration are used to calculate population change since April 1, 2020. An annual time series of estimates is produced, beginning with April 1, 2020 and extending to the vintage year. The vintage year refers to the final year of the time series. The reference date for all estimates is July 1, unless otherwise specified. With each new issue of estimates, the entire estimates series is revised. Additional information, including historical and intercensal estimates, evaluation estimates, demographic analysis, research papers, and methodology is available on website: https://www.census.gov/programs-surveys/popest.html.

Annual Intercensal Housing Unit Estimates for the United States, States, and Counties: April 1, 2000 to April 1, 2010 // Source: U.S. Census Bureau, Population Division // For the intercensal estimates methodology statement, see https://www.census.gov/popest/methodology/index.html. // The intercensal estimates for 2000-2010 for the United States housing units are produced by the Census Bureau's Population Estimates Program by modifying the 2000-2010 postcensal estimates prepared previously for the United States 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: https://www.census.gov/popest/index.html

Monthly Intercensal Estimates of the Resident Population by Single Year of Age and Sex: April 1, 1990 to April 1, 2000 // Source: U.S. Census Bureau, Population Division // For detailed information about the methods used to create the intercensal population estimates, see https://www.census.gov/popest/methodology/intercensal_nat_meth.pdf. // The Census Bureau's Population Estimates Program produces intercensal estimates each decade by adjusting the existing time series of postcensal estimates for a decade to smooth the transition from one decennial census count to the next. They differ from the postcensal estimates that are released annually because they rely on a formula that redistributes the difference between the April 1 postcensal estimate and April 1 census count for the end of the decade across the estimates for that decade. Meanwhile, the postcensal estimates incorporate current data on births, deaths, and migration to produce each new vintage of estimates, and to revise estimates for years back to the last census. The Population Estimates Program provides additional information including historical and postcensal estimates, evaluation estimates, demographic analysis, and research papers on its website: https://www.census.gov/popest/index.html.

Monthly Intercensal Estimates of the Civilian Population by Single Year of Age and Sex: April 1, 1990 to April 1, 2000 // Source: U.S. Census Bureau, Population Division // For detailed information about the methods used to create the intercensal population estimates, see https://www.census.gov/popest/methodology/intercensal_nat_meth.pdf. // The Census Bureau's Population Estimates Program produces intercensal estimates each decade by adjusting the existing time series of postcensal estimates for a decade to smooth the transition from one decennial census count to the next. They differ from the postcensal estimates that are released annually because they rely on a formula that redistributes the difference between the April 1 postcensal estimate and April 1 census count for the end of the decade across the estimates for that decade. Meanwhile, the postcensal estimates incorporate current data on births, deaths, and migration to produce each new vintage of estimates, and to revise estimates for years back to the last census. The Population Estimates Program provides additional information including historical and postcensal estimates, evaluation estimates, demographic analysis, and research papers on its website: https://www.census.gov/popest/index.html.

Annual Resident Population Estimates by Age, Sex, Race, and Hispanic Origin for the Nation, State, Metropolitan and Micropolitan Statistical Areas, Puerto Rico Commonwealth, Counties, Puerto Rico Municipios. Source: U.S. Census Bureau, Population Division. The estimates are developed from a base that incorporates decennial census data, estimates data, and Demographic Analysis estimates data (where applicable). // '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 decennial census are modified to be consistent with the race categories which appear in estimates input data. This contributes to differences between the population for specific race categories shown in this file versus those published from the decennial census. Current data on births, deaths, and migration are used to calculate population change since the previous decennial census. An annual time series of estimates is produced, beginning at the date of the previous census and extending to the vintage year. The vintage year refers to the final year of the time series. The reference date for all estimates is July 1, unless otherwise specified. With each new vintage of estimates, the entire estimates series is revised. Additional information, including historical and intercensal estimates, evaluation estimates, Demographic Analysis estimates, research papers, and methodology is available on the Population Estimates Program website: https://www.census.gov/programs-surveys/popest.html.

Annual Resident Population Estimates for Puerto Rico Municipios: April 1, 2010 to July 1, 2013 // File: 7/1/2013 Puerto Rico Municipio Population Estimates // Source: U.S. Census Bureau, Population Division // Release Date: March 2014 // Note: The estimates are based on the 2010 Census and reflect changes to the April 1, 2010 population due to the Count Question Resolution program and geographic program revisions. All geographic boundaries for these population estimates are as of January 1, 2013. For detailed information about the methods used to create the population estimates, see http://www.census.gov/popest/methodology/index.html. // Each year, the Census Bureau's Population Estimates Program (PEP) utilizes current data on births, deaths, and migration to calculate population change since the most recent decennial census, and produces a time series of estimates of population. The annual time series of estimates begins with the most recent decennial census data and extends to the vintage year. The vintage year (e.g., V2013) refers to the final year of the time series. The reference date for all estimates is July 1, unless otherwise specified. With each new issue of estimates, the Census Bureau revises estimates for years back to the last census. As each vintage of estimates includes all years since the most recent decennial census, the latest vintage of data available supersedes all previously produced estimates for those dates. The Population Estimates Program provides additional information including historical and intercensal estimates, evaluation estimates, demographic analysis, and research papers on its website: http://www.census.gov/popest/index.html.

Annual Estimates of the Resident Population by Five-Year Age Groups and Sex for the Municipios of Puerto Rico // Source: U.S. Census Bureau, Population Division // Note: The estimates are based on the 2010 Census and reflect changes to the April 1, 2010 population due to the Count Question Resolution program and geographic program revisions. // For detailed information about the methods used to create the population estimates, see http://www.census.gov/popest/methodology/index.html. // Each year, the Census Bureau's Population Estimates Program (PEP) utilizes current data on births, deaths, and migration to calculate population change since the most recent decennial census, and produces a time series of estimates of population. The annual time series of estimates begins with the most recent decennial census data and extends to the vintage year. The vintage year (e.g., V2013) refers to the final year of the time series. The reference date for all estimates is July 1, unless otherwise specified. With each new issue of estimates, the Census Bureau revises estimates for years back to the last census. As each vintage of estimates includes all years since the most recent decennial census, the latest vintage of data available supersedes all previously produced estimates for those dates. The Population Estimates Program provides additional information including historical and intercensal estimates, evaluation estimates, demographic analysis, and research papers on its website: http://www.census.gov/popest/index.html

This data set represents 2000 population density by block group as a 100-m grid using data from the 2000 Census of Population and Housing. The demographic data is from CensusCD 2000 Short Form Blocks published by GeoLytics, E. Brunswick, NJ, which uses the 2000 Census Summary File 1 (SF 1). Grid cell values represent population density in people per square kilometer multiplied by 10 so that the data could be stored as integer.