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| Reference > Population |
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POPULATION
About the Data |
Population > About the
Data
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About the Data |
| Welcome to the About the Data Section. In this section you can get information about various data presented in the population section. Use the drop down list above to select the information you would like to view. |
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About Population Division |
The Population Division serves as New York City government's hub of demographic expertise. The division provides a number of services to city agencies, and other organizations doing business in New York City. Foremost among these is dissemination of data and analysis of population and housing as part of:
- Local and citywide planning studies
- Environmental reviews
- Capital planning
- Needs assessments
- Policy formulation
- Program planning and implementation
- Special studies related to issues of importance to the city
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American Community Survey |
The American Community Survey (ACS) is a Census Bureau nationwide survey designed to provide annual updates for geographic areas of at least 65,000 population. This encompasses New York City, the five boroughs and 55 Public Use Microdata areas (PUMAS) that approximate NYC Community Districts; all PUMAS, in fact, have at least 100,000 population. By 2010, data will be available for all geographic areas of the nation, down to the census tract and block group levels.
The ACS has been in its testing phase for almost a decade. 2005 saw the first release of data tabulations from the full three percent ACS sample. Tabulations are available for geographic areas of at least 65,000 population in this initial release. Data in this release are for the population in households, and thus exclude about 200,000 persons in group quarters - college dorms, institutions and other facilities where people do not live in separate housing units. The 2006 ACS, however, covers all persons including those in group quarters. Given the additional population included in 2006, caution must be exercised when comparing these data with previous estimates.
Selected Data Profiles and tables include data from 2000 for the purposes of comparison. When possible, we use data from the Census 2000 Supplementary Survey (C2SS), a nationwide sample of some 700,000 households, which was aimed at demonstrating the operational feasibility of the ACS. Like with all data applications, there are tradeoffs. The C2SS sample is smaller than the sample from the 2000 Census long-form or the 2005 ACS, limiting the number of comparisons that we can make or the estimates that can be derived. For selected tables, “N” may appear in situations where insufficient sample size was available to create an estimate. Similarly, only 2005 data are shown for some detailed tables, usually in cases where the number of categories overwhelms the size of the sample. The main reason for using the C2SS relates to its conceptual consistency with the 2005 ACS. The C2SS and 2005 ACS use similar questionnaires and procedures, the same data collection schedule, identical residence rules, and the same reference periods for questions, all of which enhance the comparability of the data.
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Population Estimates |
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Population Estimates provide the latest available information on New York City's population preprared by the U.S. Census Bureau and evaluated by the Department of City Planning. |
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New York City Population Projections by Age/Sex and Borough, 2000-2030 |
This report presents an analysis of New York City’s population projected through 2030. The projection
was done for each of the city’s five boroughs by age and sex, at five year intervals for 2000
through 2030.
The projections were created using a cohort component model, which breaks down
population growth into three main components: births, deaths, and migration. The cohort component
model uses births, deaths, and migrants to move age/sex cohorts forward through time,
creating a new age/sex distribution at each five year time point. A particular cohort's ability to
grow or decline is dependent on how these components affect each age/sex group. The success
of the model depends on identifying appropriate fertility, mortality, and migration rates to apply to
different age groups.
The briefing booklet provides a condensed version of the projected population to 2030. The full report has three sections. The first section presents population projections for 2000 to 2030, focusing on the school-age (ages 5 to 17) and elderly (ages 65 and over) populations. The second section discusses these projections in the context of New York City’s recent demographic past (1950–2000). The third section consists of two appendices. Appendix 1 presents the underlying demographic assumptions made in these projections, along with a detailed description of the data and methodology employed. While presentations in this report focus primarily on the projected total, school-age, and elderly populations by borough, Appendix 2 of this report provides detailed tables with projected populations for all age groups by sex and by borough. |
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Lower Manhattan Study |
This paper seeks to assess how social, demographic, and economic conditions in Lower
Manhattan have changed in the first half of this decade.
The decennial census long form,
which is sent to approximately one-in-six households, has been the primary source of
small area social and economic data used by local policy makers, program planners, and
service providers. These data provided detailed information on those who resided in
Lower Manhattan in April 2000, and on the huge flows of workers into and out of that
area. With these data becoming largely irrelevant due to the dramatic changes brought
about by 9/11, it was crucial to gain an understanding of Lower Manhattan’s population
in the post-9/11 period to help advance the rebuilding process.
The dislocation brought about by catastrophic events, such as 9/11, are often manifested in changes in the age
structure of the population, the composition and living arrangements of households, and
patterns of migration. Furthermore, because the number of persons who work in Lower
Manhattan is so large, understanding post-9/11 changes in the flow of workers, their
mode of transportation to work, and the origins of their work trips could be brought to
bear on decisions about rebuilding infrastructure and investments in programs for these
populations. Without an alternative to the traditional census long form, the city would
have to wait until 2012 for a post-9/11 view of Lower Manhattan. |
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Neighborhood Change to 2010 |
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This document provides a neighborhood map depicting projected population growth between 2000 and 2010. This analysis is based on net new construction between 2000 and 2006, as well as units added due to alterations of existing buildings during this period, and on permits in the pipeline that are likely to result in new housing between 2006 and 2010. |
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An Evaluation of the Quality and Utility of ACS Five Year Estimates for Bronx Census Tracts and Neighborhoods |
The capacity of the American Community Survey (ACS) to replace the decennial census long form is based on the validity and reliability of these data at the census tract-level. This research builds on an earlier analysis of ACS test data for the Bronx that utilized special three-year averages for neighborhoods, which were census tract aggregates. The availability of census tract data for the Bronx, which are five-year averages, provides an ideal opportunity to ask about the quality and usefulness of these data, which will become available for all census tracts in 2010. This study evaluates the reliability of these census tract attributes against those provided by the 2000 Census. Further, we attempt to gauge the usefulness of these estimates by comparing the ACS five-year averages to administrative data at the census tract level for selected population, housing and economic items. |
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Small Area Data Quality: A Comparison of Estimates 2000 Census and the 1999-2001 ACS Bronx, New York Test Site |
The American Community Survey (ACS) has replaced the decennial census long form, based on the premise that the ACS is capable of creating an accurate and useful socioeconomic picture of sub-county areas, such as neighborhoods in large cities. This study compares estimates from the 1999-2001 ACS and the 2000 Census for 88 neighborhoods in Bronx County, New York. It asks whether estimates from the ACS can replace those from the census sample by drawing a picture of similarities and differences; meaningful differences are defined in this study as those that can affect the work of a large city planning agency. The results show that, despite some important conceptual differences, most estimates from the 1999-2001 ACS do not differ from those in the 2000 Census in a meaningful way; however, there are some important exceptions. Examining differences in the context of the data collection effort (mail return rates, household nonresponse rates) and in terms of data quality (item allocation levels) leads to a better understanding of differences between the two surveys. |
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Changes in Employment and Commuting Patterns Among Workers in New York City and the New York Metropolitan Area, 2000-2007 |
Using the 2000 US Census and the 2007 American Community Survey (ACS), this Census Brief examines changes in employment and commuting patterns in New York City and the New York City Metropolitan Area from 2000 to 2007. Between 2000 and 2007, concurrently with large employment increases, there was a pronounced shift in the New York Metropolitan Area from auto commuting to public transportation. While this shift was most pronounced in the New York City, it existed in the suburbs as well. These findings represent a reversal of the trend from 1980 to 2000, in which transit commuters decreased as a share of all workers in the city.
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