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Our population statistics cover age, sex, race, Hispanic origin, migration, ancestry, language use, veterans, as well as population estimates and projections.
This section provides information on a range of educational topics, from educational attainment and school enrollment to school districts, costs and financing.
We measure the state of the nations workforce, including employment and unemployment levels, weeks and hours worked, occupations, and commuting.
Our statistics highlight trends in household and family composition, describe characteristics of the residents of housing units, and show how they are related.
Health statistics on insurance coverage, disability, fertility and other health issues are increasingly important in measuring the nation's overall well-being.
We measure the housing and construction industry, track homeownership rates, and produce statistics on the physical and financial characteristics of our homes.
The U.S. Census Bureau is the official source for U.S. export and import statistics and regulations governing the reporting of exports from the U.S.
The U.S. Census Bureau provides data for the Federal, state and local governments as well as voting, redistricting, apportionment and congressional affairs.
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Geography provides the framework for Census Bureau survey design, sample selection, data collection, tabulation, and dissemination.
Geography is central to the work of the Bureau, providing the framework for survey design, sample selection, data collection, tabulation, and dissemination.
Find resources on how to use geographic data and products with statistical data, educational blog postings, and presentations.
The Geographic Support System Initiative will integrate improved address coverage, spatial feature updates, and enhanced quality assessment and measurement.
Work with interactive mapping tools from across the Census Bureau.
Find geographic data and products such as Shapefiles, KMLs, TIGERweb, boundary files, geographic relationship files, and reference and thematic maps.
Metropolitan and micropolitan areas are geographic entities used by Federal statistical agencies in collecting, tabulating, and publishing Federal statistics.
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Definitions of geographic terms, why geographic areas are defined, and how the Census Bureau defines geographic areas.
We conduct research on geographic topics such as how to define geographic areas and how geography changes over time.
Visit our library of Census Bureau multimedia files. Collection formats include audio, video, mobile apps, images, and publications.
Official audio files from the Census Bureau, including "Profile America," a daily series of bite-sized statistics, placing current data in a historical context.
Infographics include information on the Census Bureau's history of data collection, our nation's veterans and the American Community Survey.
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Developer portal to access services and documentation for the Census Bureau's APIs.
Explore Census Bureau data on your mobile device with interactive tools.
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These external sites provide more data.
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Learn how we serve the public as the most reliable source of data about the nation's people and economy.
Information about the U.S. Census Bureau.
Information about what we do at the U.S. Census Bureau.
Our researchers explore innovative ways to conduct surveys, increase respondent participation, reduce costs, and improve accuracy.
Our surveys provide periodic and comprehensive statistics about the nation, critical for government programs, policies, and decisionmaking.
Learn about other opportunities to collaborate with us.
Explore the rich historical background of an organization with roots almost as old as the nation.
Explore prospective positions available at the U.S. Census Bureau.
Information about the current field vacancies available at the U.S. Census Bureau Regional Offices.
Discover the latest in Census Bureau data releases, reports, and events.
The Census Bureau's Director writes on how we measure America's people, places and economy.
Find interesting and quirky statistics regarding national celebrations and major events.
Profile America is a daily, 60-second feature that uses interesting vignettes for that day to highlight information collected by the Census Bureau.
Find media toolkits, advisories, and all the latest Census news.
See what's coming up in releases and reports.
What options are available for extracting data for all ZIP Code® Tabulation Areas? (ZCTA™) in the nation?
What options are available for extracting data for all census tracts, block groups or blocks in the nation?
What is the US Summary File and the National File?
Why am I seeing more than one record for the same area?
Why am I seeing "duplicate" blocks in Summary File 1?
How do I link Census 2000 data to other data sets or GIS boundary files?
Why do I get an error message when trying to create an output file with the Census 2000 Data Engine?
SF1 and SF3 users can use American FactFinder, the National File data set in ASCII text data format or purchase either the National File or US Summary software version disc product. Data is not available for ZIP Code® Tabulation Areas from SF2 or SF4.
The best option, for most SF1 and SF3 users, is the US Summary software version disc products. Extracting data for census tracts (and below) from SF1 and SF3 with the ASCII text data files requires repeating the same process for each state or carefully combining the individual state data sets beforehand. The latter procedure would require creating a two key field consisting of STATE + LOGRECNO to link the data to the geographic identifiers (that identify the specific area). Either way, this can be a time consuming and error prone process.
SF2 and SF4 data users can use the National File data set in ASCII text data format or the National File software version disc product to extract data for whole census tracts only.
These distinctions apply to the original ASCII text data files and the DVD-ROM disc products only ; not to American FactFinder or DataFerret.
The National File contains data for larger geographic area types such as the United States, regions, divisions, states, counties, county subdivisions, places, metropolitan statistical areas, congressional districts (106th Congress), American Indian and Alaska Native Areas, and Hawaiian Home Lands. The SF1 and SF3 National Files include data for whole ZCTAs™ but does not include data for census tracts, census block groups or census blocks. The SF2 and SF4 National Files include data for whole census tracts only but does not include data for for ZCTAs™.
The US Summary File is a compilation of all of the individual state summary files in their entirety. It is available on software version DVD-ROM disc only. See Chapter 4 of the appropriate summary file documentation for a complete list of available summary levels (area types) for the State Summary files and the National File. This information is presented in separate charts.
If more than one record appears for a specific area, that area has been split into parts for that summary level (see SUMLEV). This can be seen by looking at the codes for each element of the complete summary level description in Chapter 4 of the file documentation. The next question includes an example.
Also, some larger summary levels such as state or county totals also have data for geographic components of the area. This can be seen by looking at the left column of the summary level sequence charts in Chapter 4 of the file documentation. A look at the value of the geographic component variable GEOCOMP should clear up any remaining confusion. More information about this variable, including a code list, is available from Chapter 7 of the file documentation.
Summary File 1 includes only one block summary level.
101 State-County-County Subdivision-Place/Remainder-Census Tract-Block Group-Block
If a block crosses county subdivision and/or place boundaries, its' data are split into multiple records. This can be seen by looking at the value in the geographic identifier field for each element of the complete summary level description above. Each element in the above description is separated by dashes.
A specific combination of geographic identifier fields, based on the field SUMLEV (summary level), is used to identify a specific area and link data for that area to separate boundary files. This combination will include a numeric code or a number for each geographic element in the complete summary level description. See Chapter 4 of the appropriate file documentation for a complete list of summary level codes and descriptions.
ASCII text data file users will find the geographic identifiers (including SUMLEV) in the data set's geographic identifier file (which should initially appear last in the directory). The LOGRECNO field is used solely to link data files in a data set to the geographic identifier file within the same data set. LOGRECNO can not be used to link any file in the data set to any file outside the data set.
Software version disc users can select individual geographic identifier fields (including SUMLEV) from the Geographic Identifiers folder on the Simple Variables tab. Output data files created with the software will also include an automatically created field labeled KEY that contains a specific combination of geographic identifier fields based on the value of SUMLEV.
It is also a good idea to examine the GEOCOMP (geographic component) field after you have filtered the data by SUMLEV. If GEOCOMP does not equal "00", the data for that record is for a subset of the total area and/or population. See Chapter 4 (left two columns) and the Footnote Section of Chapter 7 (Data Dictionary) for a complete list of descriptions and codes for GEOCOMP.
"The Microsoft Jet Engine reported an Error: "System resource exceeded."
This error message seems limited to some Windows XP users so far. It appears in response to an attempt to create an output file in any format other than comma separated variable (*.csv).
The following links have information on downloading and using the latest version of the Microsoft Jet Engine for specific versions of Windows.
It is also recommended that users upgrading their operating system to Windows XP from a prior version of Windows implement a full installation of Windows XP from a Microsoft CD as opposed to from an image or "stamped" installation.