Tracking Federal Awards: USAspending.gov and Other Data Sources [October 24, 2017] [open pdf - 634KB]
"USAspending.gov, available at http://www.USAspending.gov, is a government source for data on federal awards by state, congressional district (CD), county, and zip code. The awards data in USAspending.gov is provided by federal agencies and represent contracts, grants, loans, and other forms of financial assistance. Using USAspending.gov to locate and compile accurate data on federal awards can be challenging due to continued data quality problems identified by the U.S. Government Accountability Office (GAO). Users of USAspending.gov need to be aware that while search results may be useful for informing consideration for certain questions, these results may be incomplete or have inaccuracies. USAspending.gov was created under P.L. 109-282, the Federal Funding Accountability and Transparency Act of 2006 (FFATA), and is being enhanced by requirements of P.L. 113-101, the Digital Accountability and Transparency Act of 2014 (DATA Act)."
CRS Report for Congress, R44027
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html