In the States, boats and other vessels which are not required to be inspected and which carry a certificate of inspection issued by the U.S. Coast Guard are registered with the state where they are home-ported. The states mandate things like carrying approved safety equipment for all those aboard, but otherwise do not specify design or construction features of the vessel itself.
The regulations which inspected vessels must meet are contained in two parts of the Code of Federal Regulations, Title 46 and Title 33. You can find these regulations here:
There are no design standards at a limit of 20 feet or more. Some requirements like fuel systems, lights etc. can be found in the ABYC site. The CFR has some other regulations which are mandatory as opposed to optional from ABYC. However, following ABYC gives you legal protection.
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