On January 11, 2011, the US Census Bureau released the 2007-2009 American Community Survey (ACS) three-year estimates on American FactFinder. The estimates have a 3-year time frame and are only available for areas with populations of 20,000 or more. To access the data, please visit the US Census Bureau ACS page.
In addition, the FHWA Office of Planning has added links to two different calculators to the FHWA web page on census data. One is from the State Data Center network, and the other is from University of South Florida, Center for Urban Transportation Research. For more information, please visit the FHWA planning page under the category “training.”