1. Constitutional Law - supreme law of the land. The basis of law in the US.
2. Statutory Law - Enacted by legislative bodies. Uniform laws. Each state has the option of accepting/modifying a uniform law. Ex: UCC.
3. Administrative Law - Rules, orders, decisions of admin agencies. Includes federal, state, and local agencies.
4. Case Law and Common Law - Judge-made law, doctrines and principles announced in cases. Governs all areas not covered by statutory/administrative law. Part of our common law tradition; early English roots circa 1066.