Here are several Federal Government agencies which are important sources of business and economic information:
Here is a collection of important Federal Government sources of statistical data, the most imporant of which may be the Statistical Abstract of the United State.
The two most important search tools for discovering what the Federal Government has published in recent years:
Leyburn Library maintains lists of Web sites which can take you to official state
government and local government sites.
But more useful for research might be the professional associations of and for those who work in state government and local government.
Please note the possibility of using the "Rollyo" search engine to search each of these groups of association Web sites.