Tracking Federal Awards: USAspending.gov and Other Data Sources [Updated November 26, 2019] [open pdf - 1MB]
From the Summary: "USAspending.gov, available at http://www.USAspending.gov, is a government source for data on federal awards by state, congressional district (CD), county, city, and zip code. The awards data in USAspending.gov are 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, in part, to continuing data quality issues that have been 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 of certain questions, these results may be incomplete or contain inaccuracies. [...] Other federal awards data sources reviewed in this report include the following:  Federal Procurement Data System (FPDS);  Census Federal Audit Clearinghouse;  U.S. Budget: Aid to State and Local Governments;  Census Federal Aid to States (FAS) and Consolidated Federal Funds Report (CFFR); and  Additional federal grant awards databases, including sources tracking medical, scientific, and technical research."
CRS Report for Congress, R44027
Congressional Research Service: https://crsreports.congress.gov/