A law that violates the constitution is said to be unconstitutional.
unconstitutional
yes
National Archives
National Archives
Federal law prevails.
creons's law conflicts with divine law
conflict of the story law of life
James Madison is the "Father of The Constitution".
One of those laws must be repealed.
The US Supreme Court may overturn a law for a variety of reasons. The reason most likely to bring publicity to the decision is a ruling that a law is "unconstitutional." That means that the law conflicts in some way with the provisions of the US Constitution.
A judge.
Generally, cities and counties and townships (etc.) are created by the State legislature and get all their powers of government by permission of the State. So if a local "home rule" law conflicts with a state law, the state law should prevail. The local law should be void and unenforceable. The law would call it "ultra vires" meaning the local government went beyond their authority to pass such a law. But if state law says that local governments are allowed to regulate things above and beyond the state level of regulation, then it's OK. So really, the answer is "it depends" on what law on what subject, and in what jurisdiction.
Supreme Court