For Statutes, Acts, Laws
GovInfo contains all published versions of bills from the 103rd (1993-1994) Congress forward.
Congress.gov has statutory information from the 93rd Congress (1973-1974) to present.
Beginning with the 58th Congress (March 4, 1903-present), bill numbers for enacted statutes can be obtained by consulting the Statutes at Large.
Identifying Bill Numbers
The format of a bill number is [Chamber][Type][Number]. For the U.S. Congress, there are two chambers
There are several types of bills:
Here are some example bill numbers: HB5592, S.Res.536, H.Con.Res.280, SJR375.