Free public access to United States government documents in a federal depository library is guaranteed by law (44 USC §1911). While UC Berkeley houses one of the most comprehensive collections of U.S. government documents in the country, the Library is one of over a thousand Federal Depository Libraries across the United States, and one of several Federal Depository Libraries in the San Francisco Bay Area.
These sources provide quick access to the most requested data/statistics. They also provide citation information which can lead you to more sources for in-depth statistics or even raw numeric and text data.