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The Census Bureau calls individual level data or household level data "microdata". If you use microdata you'll be able to see the individual responses of households and individuals as opposed to seeing summary statistics about all households in a given state etc.
Information about changes to the ACS or any releases of new data will be posted to this news site. There is also a schedule of upcoming data releases on this site.
Census Bureau ACS RSS Feed:
Below are news items about upcoming data releases
ACS PUMS (Public Use Microdata Sample) data files includes records about individual people and households. While the ACS Profiles and Tables include interesting information, if you need to access person-level data then you'll want to download PUMS data files. The Census Bureau releases two PUMS files per year (a 1-year estimate and a 5-year estimate). The 5-year estimate 2005-2009 contains the same data as the 1-year estimates for each year from 2005-2009. 1-year and 5-year PUMS data files are available from the following site:
CSV and SAS files are available for download. You will need software to analyze the data.
IPUMS allows you to easily create your own custom datasets to download. It combines historical ACS and Decennial Census into one platform and has coverage through the present. After you select the samples and variables, you custom dataset can be downloaded in Stata (.dta), SPSS (.sav), SAS (.sas7bdat), comma delimited (.csv), and fixed-width text (.dat) form.
You will find other options for downloading ACS PUMS data files here such as FTP.