Black's Law Dictionary, Sixth Edition, p. 1018

Municipal law.  That which pertains solely to the citizens and inhabitants of a state, and is thus distinguished form political law, commercial law, and international law.  City of Louisville v. Babb, C.C.A.Ind., 75 F.2d 162, 165.  In its more common and narrower connotation however it means those laws which pertain to towns, cities and villages and their local government.  People ex re. Ray v. martin, 294 N.Y. 61, 60 N.E.2d 541, 547, 548.

[Black's Law Dictionary, Sixth Edition, p. 1018]