Documentation: | ACS 2014 (1-Year Estimates) |
you are here:
choose a survey
survey
document
chapter
Publisher: U.S. Census Bureau
Survey: ACS 2014 (1-Year Estimates)
Document: | ACS 2014-1yr Summary File: Technical Documentation |
citation: | Social Explorer; U.S. Census Bureau; American Community Survey 2014 Summary File: Technical Documentation. |
Chapter Contents
The American Community Survey (ACS) is a part of the U.S. Census Bureau's Decennial Census Program and is designed to provide more current demographic, social, economic, and housing estimates throughout the decade. The ACS provides information on more than 40 topics, including education, language ability, the foreign-born, marital status, migration and many more. Each year the survey randomly samples around 3.5 million addresses and produces statistics that cover 1-year and 5-year periods for geographic areas in the United States and Puerto Rico, ranging from neighborhoods to Congressional districts to the entire nation. For more information about the ACS, please visit our main page at: http://www.census.gov/acs. ACS data
are published through a number of channels, including American FactFinder, QuickFacts, Easy Stats as well as the Census Bureaus Application Programming Interface (API). This document will brief data users on the contents of the ACS Summary File and explain how they can use it to obtain statistics.
are published through a number of channels, including American FactFinder, QuickFacts, Easy Stats as well as the Census Bureaus Application Programming Interface (API). This document will brief data users on the contents of the ACS Summary File and explain how they can use it to obtain statistics.
The American Community Survey Summary File (ACSSF) is a unique data product that includes all the estimates and margins of error from the Detailed Tables and geographies that are published for the ACS. Other ACS data products, such as Subject Tables and Data Profiles, are created from the Detailed Tables and are therefore not available in the ACS Summary File.
Since the Detailed Tables contain a large number of cells, the tables are stored in a series of files with only the data from the tables, without such information as the title of the tables, the description of the rows, and the names of the geographic areas. That information (or metadata) is in other files, including the Sequence Number and Table Number Lookup file and templates, that the user must merge with the data files to reproduce the tables. Learn more about the Sequence Number and Table Number Lookup file in Chapter 2.3. and the templates in Chapter 2.2.
The ACS Summary File data files are in American Standard Code for Information Interchange (ASCII) format. The files are divided into three types:
Since the Detailed Tables contain a large number of cells, the tables are stored in a series of files with only the data from the tables, without such information as the title of the tables, the description of the rows, and the names of the geographic areas. That information (or metadata) is in other files, including the Sequence Number and Table Number Lookup file and templates, that the user must merge with the data files to reproduce the tables. Learn more about the Sequence Number and Table Number Lookup file in Chapter 2.3. and the templates in Chapter 2.2.
The ACS Summary File data files are in American Standard Code for Information Interchange (ASCII) format. The files are divided into three types:
- Geographies - (position based and comma delimited)
- Geographies - (position based and comma delimited)
- Margins of Error - (comma delimited)
Data contained in the ACS Summary File cover demographic, social, economic, and housing subject areas. All Detailed Tables for the ACS 1-year and 5-year estimates are in the Summary File and are listed in Appendix A for their respective data release.
The ACS Summary File covers geographic areas based on "summary levels." A summary level specifies the content and the hierarchical relationships of the geographic elements that are required to tabulate and summarize data. For example, summary level code "040" represents the U.S. states, Washington D.C., and Puerto Rico; while summary level code "050" represents counties and county equivalents within states.
The ACS 1-year estimates are published for areas that have populations above 65,000. The ACS 3-year estimates are no longer published, but historically covered areas with populations above 20,000. The ACS 5-year estimates are published for all geographic areas, including census tracts, block groups, American Indian areas, core based statistical areas, combined statistical areas, Congressional districts, and state legislative districts. View the full list of summary levels
published for the Detailed Tables in Appendix B. Data for census block groups are published in American FactFinder, the Census Bureau API, as well as the ACS Summary File, for the 2010-2014 ACS 5-year data release. The list of tables in the 5-year Appendix A shows which tables are available at the block group level.
Many resources are available to help users understand the ACS geographic terms and concepts. For additional information, please visit the Geography Reference page at http://www.census.gov/geo/www/reference.html and the Geography and the ACS page at http://www.census.gov/programs-surveys/acs/geography-acs.html.
The ACS Summary File covers geographic areas based on "summary levels." A summary level specifies the content and the hierarchical relationships of the geographic elements that are required to tabulate and summarize data. For example, summary level code "040" represents the U.S. states, Washington D.C., and Puerto Rico; while summary level code "050" represents counties and county equivalents within states.
The ACS 1-year estimates are published for areas that have populations above 65,000. The ACS 3-year estimates are no longer published, but historically covered areas with populations above 20,000. The ACS 5-year estimates are published for all geographic areas, including census tracts, block groups, American Indian areas, core based statistical areas, combined statistical areas, Congressional districts, and state legislative districts. View the full list of summary levels
published for the Detailed Tables in Appendix B. Data for census block groups are published in American FactFinder, the Census Bureau API, as well as the ACS Summary File, for the 2010-2014 ACS 5-year data release. The list of tables in the 5-year Appendix A shows which tables are available at the block group level.
Many resources are available to help users understand the ACS geographic terms and concepts. For additional information, please visit the Geography Reference page at http://www.census.gov/geo/www/reference.html and the Geography and the ACS page at http://www.census.gov/programs-surveys/acs/geography-acs.html.
Since using the ACS Summary File can be challenging, it is recommended that users first check if their tables of interest are available for download on American FactFinder (AFF). Below are some other options to help users retrieve the tables they want. They are listed in order based on ease of use. You can access these tools, as well as instructions on how to access ACS estimates using the AFF Download Center, on the ACS Summary File Documentation page at http://www.census.gov/programs-surveys/acs/technical-documentation/summary-filedocumentation.html.
ACS Summary File Documentation page.
Summary File Documentation page.
- Summary File Excel Import Tool
ACS Summary File Documentation page.
- SAS Programs
Summary File Documentation page.
- Summary File DataFerrett Tool (5-year release only)
Here are some notable changes for the 2014 ACS Summary Files:
Tool and view detailed instructions on using the AFF Download Center by visiting the ACS Summary File Documentation page at http://www.census.gov/programssurveys/acs/technical-documentation/summary-file-documentation.html.
You can learn more about accessing block group level data using the ACS Summary File Retrieval Tool by viewing a video on the ACS Summary File page at http://www.census.gov/programs-surveys/acs/data/tools/summary-file-retrieval-tool.html.
The 15 tables to remain for Summary Level 070 include:
1. B01001-Sex by Age
2. B01003-Total Population
3. B02001-Race
4. B08007-Sex of Workers by Place of Work-State and County Level
5. B08008-Sex of Workers by Place of Work-Place Level
6. B08009-Sex of Workers by Place of Work-Minor Civil Division Level
for 12 Selected States (CT, ME, MA, MI, MN, NH, NJ, NY, PA, RI, VT, WI)
7. B08301-Means of Transportation to Work
8. B08302-Time Leaving Home to Go to Work
9. B08303-Travel Time to Work
10. B08601-Means of Transportation to Work for Workplace Geography
11. B08602-Time Arriving at Work from Home for Workplace Geography
12. B08603-Travel Time to Work for Workplace Geography
13. B08604-Worker Population for Workplace Geography
14. B25001-Housing Units
15. B25003-Tenure
State-County-County Subdivision-Place/Remainder that are not available on American FactFinder. These geographies are "Louisville city (part), Louisville Central CCD, Jefferson County, Kentucky" and "Louisville city (part), Louisville West CCD, Jefferson County, Kentucky." These two additional areas were not published in American FactFinder due to the Census Bureaus Geography Divisions changes to Louisville city.
More details concerning this change can be found on the ACS website on
http://www.census.gov/programs-surveys/acs/technical-documentation/table-andgeography-
changes/2013/geography-changes.html.
- Reorganization of ACS Website and FTP Site
- Discontinuation of the ACS Summary File Retrieval Tool
Tool and view detailed instructions on using the AFF Download Center by visiting the ACS Summary File Documentation page at http://www.census.gov/programssurveys/acs/technical-documentation/summary-file-documentation.html.
- 3-Year Estimates Discontinued
- Block Groups Continue to be Available in American FactFinder
You can learn more about accessing block group level data using the ACS Summary File Retrieval Tool by viewing a video on the ACS Summary File page at http://www.census.gov/programs-surveys/acs/data/tools/summary-file-retrieval-tool.html.
- Streamlining Summary Level 070 Tables
The 15 tables to remain for Summary Level 070 include:
1. B01001-Sex by Age
2. B01003-Total Population
3. B02001-Race
4. B08007-Sex of Workers by Place of Work-State and County Level
5. B08008-Sex of Workers by Place of Work-Place Level
6. B08009-Sex of Workers by Place of Work-Minor Civil Division Level
for 12 Selected States (CT, ME, MA, MI, MN, NH, NJ, NY, PA, RI, VT, WI)
7. B08301-Means of Transportation to Work
8. B08302-Time Leaving Home to Go to Work
9. B08303-Travel Time to Work
10. B08601-Means of Transportation to Work for Workplace Geography
11. B08602-Time Arriving at Work from Home for Workplace Geography
12. B08603-Travel Time to Work for Workplace Geography
13. B08604-Worker Population for Workplace Geography
14. B25001-Housing Units
15. B25003-Tenure
- Two Additional Areas Included in the 2010-2014 ACS 5-Year Summary File
State-County-County Subdivision-Place/Remainder that are not available on American FactFinder. These geographies are "Louisville city (part), Louisville Central CCD, Jefferson County, Kentucky" and "Louisville city (part), Louisville West CCD, Jefferson County, Kentucky." These two additional areas were not published in American FactFinder due to the Census Bureaus Geography Divisions changes to Louisville city.
More details concerning this change can be found on the ACS website on
http://www.census.gov/programs-surveys/acs/technical-documentation/table-andgeography-
changes/2013/geography-changes.html.