Example Call: http://api.census.gov/data/2013/acs/acs5/profile?get=DP02_0001PE&for=state:*&key=... (See notes)
2009 - 2013 ACS Data Profile API Variables [ html | xml | json ]
ACS Technical Documentation

Notes on ACS Data

Calls to the API may return these codes in place of data.

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FTP Server

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American Community Survey (ACS)

The American Community Survey is the premier source for information about America's changing population, housing and workforce.