View the detailed codes and definitions for variables, statistical testing, and an explanation of sample design, methodology, and accuracy for the American Community Survey.
Detailed codes for variables that contain a large number of coded responses, such as ancestry and occupation
Definitions of population and housing variables to help you understand the results of the American Community Survey
Definitions for classifying group living situations according to the type of housing and/or services provided
Learn more about comparing the 2009 ACS with Census 2000, 3-year to 3-year, or 5-year to 5-year estimates.
Basic instructions for obtaining the ACS standard errors needed to do statistical testing
Spreadsheet to quickly test whether ACS estimates are statistically different from one another
A basic explanation of the sample design, estimation methodology, and accuracy of the data