Really big! Over 49.9 million people have been surveyed in the American Community Survey over the past ten years, 2007-2016.
The American Community Survey (ACS) collected by the US Census Bureau is the replacement for the “long form census” conducted on April 1st of years ending in “0”. The last traditional “long form census” was in year 2000.
The American Community Survey was introduced to my professional community in the mid-1990s as the Continuous Measurement (CM) program. That name didn’t stick or click, and the Census Bureau renamed it the American Community Survey in the late 1990s.
The first, fully functional, nationwide implementation of the ACS was in 2005, though that year excluded group quarters (dormitories, prisons, hospitals, etc) persons. Group quarters were introduced in the 2006 ACS, so 2006 is sometimes considered the first year of full implementation. (If you’re just interested in household and housing characteristics, then don’t overlook the 2005 ACS!)
Well, is the ACS the same sample size, in general, as the older long form data?
Yes, if you look at ten years worth of ACS data.