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Census Small-Area Geography
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<br />Census Tract
<br />Census 2000
<br />Geographic Areas
<br />American Indian/Alaska Native
<br />areas and Hawaiian home lands.
<br />These areas include the legal feder-
<br />ally recognized American Indian
<br />reservations, off-reservation trust
<br />land entities, tribal subdivisions,
<br />Alaska Native Regional Corporations,
<br />and Hawaiian home lands. These
<br />areas also include the tribal-desig-
<br />nated statistical areas, Oklahoma
<br />tribal statistical areas, and Alaska
<br />Native village statistical areas that
<br />are defined for federally recognized
<br />tribes without a legal land base. The
<br />boundaries of federally recognized
<br />American Indian and Alaska Native
<br />areas are provided by the tribal
<br />governments. The State of Hawaii
<br />Department of Hawaiian Home Lands
<br />provides the boundaries for Hawaiian
<br />home lands. The boundaries of
<br />state-recognized American Indian
<br />reservations and state-designated
<br />American Indian statistical areas (for
<br />state-recognized tribes without a
<br />reservation) are provided by a state
<br />liaison designated by the state's
<br />governor.
<br />Blocks. Generally bounded by
<br />streets, legal boundaries, and other
<br />features, a block is the smallest geo-
<br />graphic unit for which the Census
<br />Bureau tabulates data. Approxi-
<br />mately 8.5 million blocks are identi-
<br />fied in Census 2000.
<br />Block groups (BGs). Block groups
<br />are a collection of census blocks
<br />within a census tract, sharing the
<br />same first digit of their four-digit
<br />identifying numbers.
<br />Census tracts. These small sta-
<br />tistical subdivisions (averaging about
<br />4,000 persons) of counties generally
<br />have stable boundaries and, when
<br />first established, were designed to
<br />have relatively homogeneous
<br />demographic characteristics.
<br />Counties and equivalent areas.
<br />These are the primary divisions of
<br />most states, Puerto Rico, and the
<br />Island Areas. They include counties
<br />in 48 states; parishes in Louisiana;
<br />boroughs and census areas in
<br />Alaska; municipios in Puerto Rico;
<br />independent cities in Maryland,
<br />Missouri, Nevada, and Virginia; and
<br />other entities in the Island Areas.
<br />Metropolitan areas (MAs). An
<br />MA consists of a large population
<br />nucleus of 50,000 population or
<br />greater, together with adjacent
<br />communities having a high degree
<br />of social and economic integration
<br />with that core. Metropolitan areas
<br />comprise at least one county, except
<br />in New England, where cities and
<br />towns are the basic geographic units.
<br />Minor Civil Divisions (MCDs)/
<br />Census County Divisions (CCDs).
<br />MCDs are legally defined county
<br />subdivisions such as towns and
<br />townships. In 21 states where MCDs
<br />do not exist or are not adequate far
<br />reporting subcounty statistics, the
<br />Census Bureau, in cooperation with
<br />state and local officials, delineates
<br />county subdivisions known as
<br />Census County Divisions.
<br />Places. Incorporated places are
<br />concentrations of population such
<br />as cities, that have legally prescribed
<br />boundaries, powers, and functions.
<br />Other population centers without
<br />legally defined corporate limits or
<br />corporate powers are defined by the
<br />Census Bureau in cooperation with
<br />state officials and local data users.
<br />These are called Census-Designated
<br />Places and are identified in data
<br />tables by the acronym CDP following
<br />the place name.
<br />States and equivalent areas.
<br />Besides the 50 states, the Census
<br />Bureau treats the District of Colum-
<br />bia, Puerto Rico, and the Island Areas
<br />(the U.S. Virgin Islands, Guam,
<br />American Samoa, and the Northern
<br />Mariana Islands) as state equivalents
<br />for statistical presentation.
<br />Urban areas. Urban areas consist
<br />of urbanized areas (UAs) and other
<br />urban entities. A UA consists of
<br />densely settled territory with a
<br />population of 50,000 or more in-
<br />habitants. Other urban areas have
<br />from 2,500 to 49,999 population.
<br />Voting districts. Voting districts
<br />represent areas created for the pur-
<br />pose of conducting elections. They
<br />include election districts, precincts,
<br />wards, polling areas, and other types
<br />of electoral units submitted to the
<br />Census Bureau by states participating
<br />in the Redistricting Data Program.
<br />ZIP Code Tabulation Area
<br />(ZCTATM). ZCTAs are approximate
<br />representations of five- or three-digit
<br />U.S. Postal Service ZIP Code service
<br />areas. ZCTAs are composed of census
<br />blocks and represent the majority ZIP
<br />Code for addresses within a census
<br />block.
<br />U.S. Census Bureau
<br />Census 2000 Data
<br />Products Available
<br />in Many Forms
<br />Census 2000 Data Products
<br />The decennial census yields a
<br />wealth of data, which have virtually
<br />unlimited applications. A complete
<br />line of Census 2000 data products
<br />will soon be available to meet these
<br />requirements.
<br />Detailed results of Census 2000 will
<br />be contained in a series of five files
<br />that you can access through the
<br />Internet and on CD-ROM or DVD.
<br />Several related electronic and print
<br />products include Demographic
<br />Profiles of most geographic areas;
<br />Quick Tables that allow users to
<br />choose from among approximately
<br />50 table shells, then specify the
<br />geographic area and the universe or
<br />population subgroup (such as the
<br />African American or the Hispanic
<br />population); and approximately 30
<br />Geographic Comparison Tables
<br />that will enable users to compare
<br />key data items across geographic
<br />areas. In addition, there will be
<br />three series of reports available
<br />in print and in Portable Document
<br />Format (PDF) on the Internet.
<br />Internet. For easy access to all
<br />Census 2000 information, click
<br />on American FactFinderT"' on the
<br />Census Bureau's home page
<br />(www.census.gov). Generally, most
<br />data products will be released first
<br />on the Internet, followed by subse-
<br />quent releases in other formats.
<br />CD-ROM and DVD. Most Census
<br />2000 tabulations and maps will be
<br />available on CD-ROMs and/or DVDs.
<br />Viewing software will be included.
<br />CD-ROMs may be ordered by phone
<br />through the Census Bureau's
<br />Customer Services Center on
<br />301-457-4100, or by clicking on
<br />Catalog from the Census Bureau's
<br />home page.
<br />Printed reports will be sold
<br />through the U.S. Government
<br />Printing Office. Much of the
<br />information in these series will be
<br />available earlier in other data
<br />products.
<br />The following release dates are
<br />preliminary and may be revised later.
<br />Census 2000 Redistricting
<br />(Public Law 94.171) Summary
<br />File. The first Census 2000 data
<br />files to be released will be the
<br />information required for local
<br />redistricting. The data will include
<br />tabulations for the total population
<br />and the population 18 years old and
<br />over for 63 race categories, Hispanic
<br />or Latino, and race by not Hispanic
<br />or Latino. Detailed tabulations will
<br />present data down to the block level,
<br />and will be available through the
<br />Internet and through two CD-ROM
<br />series (state and national files).
<br />One Quick Table and a Geographic
<br />Comparison Table will be based on
<br />this redistricting file.
<br />Note: The Public Law 94-171
<br />numbers are expected to reflect
<br />corrections for possible overcounts
<br />and undercounts using measure-
<br />ments from the Accuracy and
<br />Coverage Evaluation survey. To ful-
<br />fillthe requirements of Public Law
<br />105-119 (enacted in 1997), the
<br />Census Bureau also must make
<br />publicly available a second version
<br />of these data that does not include
<br />the statistical corrections for
<br />overcounts and undercounts mea-
<br />sured in the Accuracy and Coverage
<br />Evaluation.
<br />Planned release date:
<br />March 2001
<br />Summary File 1 (SF 1) presents
<br />counts and basic cross-tabulations
<br />of information collected from all
<br />people and housing units. This
<br />information includes age, sex, race,
<br />Hispanic or Latino origin, household
<br />relationship, and whether the
<br />residence is owned or rented. Data
<br />will be available down to the block
<br />level for many tabulations, but only
<br />to the census-tract level for others.
<br />Summaries will also be included
<br />far other geographic areas such as
<br />ZCTAs and Congressional Districts.
<br />Related products include Demo-
<br />graphic Profiles that will give a
<br />snapshot of the geographic area;
<br />Quick Tables; Geographic Compari-
<br />son Tables, and the first of the
<br />printed report series. (See below.)
<br />Planned release date:
<br />june 2001 June 2002
<br />Summary File 2 (SF 2) will also
<br />contain 100-percent population and
<br />housing characteristics, but the
<br />tables in this file will be iterated for
<br />a selected list of detailed race and
<br />Hispanic- or Latino-origin groups, as
<br />well as American Indian and Alaska
<br />Native tribes. For this file, the lowest
<br />level of geography will be the census
<br />tract, and there will be a population-
<br />size threshold before information is
<br />shown for a particular group. Various
<br />Quick Tables and Geographic Com-
<br />parison Tables will be derived from
<br />Summary File 2.
<br />Planned release date:
<br />September 2001 July 2002
<br />Summary File 3 (SF 3) will be
<br />the first release of the information
<br />collected on a sample basis. Data
<br />will be provided down to the block
<br />group for many tabulations but only
<br />down to the census tract for others.
<br />SF 3 will also include data by ZIP
<br />Code Tabulation Area and Congres-
<br />sional District. Related products
<br />include athree-page profile report,
<br />various Quick Tables and Geographic
<br />Comparison Tables, and a printed
<br />report series, developed from the
<br />sample data.
<br />Planned release date:
<br />June-September 2002
<br />Summary File 4 (SF 4) will include
<br />tabulations of the population and
<br />housing data collected from a
<br />sample of the population. )ust as in
<br />Summary File 2, the tables on SF 4
<br />will be iterated for a selected list of
<br />race and Hispanic- or Latino-origin
<br />groups, for American Indian and
<br />Alaska Native tribes, as well as for
<br />ancestry groups. Various Quick
<br />Tables and Geographic Comparison
<br />Tables will be derived from Summary
<br />File 4.
<br />Planned release date:
<br />October 2002-February 2003
<br />Microdata
<br />Microdata allow users to prepare
<br />their own customized tabulations
<br />and cross tabulations of most
<br />population and housing subjects,
<br />using specially prepared microdata
<br />files. These files are the actual
<br />U.S. Census Bureau
<br />
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