American Community Survey
Contents
Geography
1-year estimates are published for geographic areas with populations of 65,000 or more. This threshold is set so that estimates can be made available for all states, territories, congressional districts, PUMAs, CBSAs, cities, and Native American areas.
5-year estimates are published for geographic areas with much smaller population levels. This includes ZCTAs, census tracts, and census block groups.
Frequency
The ACS is administered annually, with continuous data collection. No household is sampled more than once in 5 years.