American Community Survey
"The American Community Survey (ACS) is an ongoing statistical survey by the U.S. Census Bureau, sent to approximately 250,000 addresses monthly (or 3 million per year).[1] It regularly gathers information previously contained only in the long form of the decennial census. It is the largest survey other than the decennial census that the Census Bureau administers. The processed information provides yearly estimates for all states, as well as all cities, counties, metropolitan areas, and population groups of 65,000 people or more. For smaller areas, it is necessary to combine multiple survey years to obtain reliable estimates: three survey years in areas with 20,000 to 65,000 people, and five survey years in areas with fewer than 20,000 people. The quality of these samples was originally intended to match that of the decennial census long form, but because the sample size of the ACS is smaller than originally expected, ACS estimates are less precise than the comparable estimates from Census 2000 and prior decennial census years." (from the Wikipedia)
Tutorials:
American Community Survey: Block Group Data
American Community Survey: Data
American Community Survey: Technical Documentation
Introduction to the American Community Survey
Avoiding Pitfalls (Page 25)
ACS/Census Table Comparisons
Links:
American Community Survey (Wikipedia)
Current Population Survey (Wikipedia)
Differences Between the ACS and CPS ASEC
Last Update: January 4, 2021