US Census Bureau has released the American Community Survey 5-year (ACS 5-yr) dataset for 2005-2009.  The Detail Tables are now available in the API.  Some topics from the 2005-2009 ACS 5-year data products are different from current year. For information on these changes, visit:

• Example Call for Total Population for California and New York: api.census.gov/data/2009/acs/acs5?get=B02001_001E,NAME&for=state:06,36&key=YOUR_KEY_GOES_HERE
• 2009 ACS Detailed Table Variables [ html | xml | json ]
• ACS Technical Documentation
• Examples
• Supported Geography

• Example Call: api.census.gov/data/2009/acs/acs5/profile?get=DP04_0001E,NAME&for=us:*&key=YOUR_KEY_GOES_HERE
• 2009 ACS Data Profile Variables [ html | xml | json ]
• ACS Technical Documentation
• Examples
• Supported Geography