American Community Survey
The American Community Survey from the U.S. Census Bureau is considered the replacement for the census “long form.” Instead of collecting data every 10 years on education, occupation and other socio-economic characteristics, the ACS happens every year with resulting 1-year, 3-year and 5-year estimates for geographies that meet certain population thresholds.
Get the Data
- Access all of the data via American FactFinder.
- Interactive maps from the New York Times for select variables nationwide
Find out when to use 1-year vs. 3-year or 5-year estimates. For those who want more detail on the methods used to collect the data and insights on margins of error, use of small area data and other topics, your best bet is the ACS website.
Margins of Error and Statistical Significance
- Online ACS Calculator: This tool can test for significance or compute a value from 2 existing values (e.g., a percentage of total)
- ACS Statistics Calculator: This spreadsheet makes it easier to calculate margins of error and statistical significance from ACS estimates.
- The Search for Significance: A Crash Course in Statistical Significance: A brief tutorial about margins of error and statistical significance and how they relate to the ACS (InContext: Nov-Dec 2008).
Comparing to Census 2000
The 5-year estimates (and the other years from ACS) are not always comparable to the long-form data from previous censuses. Here are tools to help find comparable tables between the ACS and Census 2000.