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American Community Survey Summary File

The American Community Survey (ACS) Summary File is a set of comma-delimited text files that contain all of the Detailed Tables for the ACS data releases. The Summary File contains estimate, margin of error, and geography files for each release.

The Detailed Tables are stored in a series of files with only the data from the tables and without such information as the table title, description of the rows, or geographic identifiers. That information is located in other files that the user must merge with the data files to reproduce full tables.

Starting with the 2009-2013 ACS 5-year data release, block groups, the lowest level of geography published by the ACS, are available in For earlier years, block groups are available only in the ACS 5-year Summary File.

Check out our handbook, Understanding and Using the ACS Summary File, to learn more about working with the ACS Summary File.  Data, instructions, guides, and example SAS programs are provided below for each year.

  • 2020
  • 2019
  • 2018
  • 2017
  • 2016
  • 2015
  • 2014
  • 2013
  • 2012
  • 2011
  • 2010
  • 2009
  • 2008
  • 2007
  • 2006
  • 2005

American Community Survey Summary File

2009 ACS 1-year Estimates

2007-2009 ACS 3-Year Estimates

2005-2009 ACS 5-Year Estimates


Includes description of variables in each column for all sequence files.

Technical Documents

The technical documents contain information about how to use the ACS Summary File

New this year - 5-year Summary File

  • Includes first-ever block group data from the ACS (only available on the Summary File).
  • Includes all of the Detailed Tables published on the Census Bureau’s American FactFinder.
  • Includes an additional 295 Detailed Tables [XLS - <1.0 MB] not available on American FactFinder.

Summary File User Tools

Simplified Geography Files

Contains basic geography information, including LOGRECNO, GEOID, and name, in an Excel file with tabs for the US, as well as each state or state equivalent.  Compared to the standard geography files in .csv and .txt format, these simplified files contain only the geography variables needed to read the ACS Summary File into Excel.

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