Resources focus on federal-level information, but include some state/local information.
A great deal of government information is available on the Internet, directly from the websites of federal and state agencies and departments. If you know the agency involved in your research area, you can search its website directly. If you're not sure, try this Google trick:
In a Google search, enter "site:gov" + keyword(s). This will search for your keyword(s) only on websites that have the domain .gov.