An ordinance is a law passed by a municipal government. A municipality is a political subdivision of a state, within which a municipal corporation has been established to provide local government to a population in a defined area.
Ordinances constitute the subject matter of municipal law. The power of municipal governments to enact ordinances is derived from the state constitution or statutes or through the legislative grant of a municipal charter. The charter in large part dictates how much power elected officials have to regulate actions within the municipality.
Many ordinances deal with maintaining public safety, health, morals, and general welfare. For example, a municipality may enact housing ordinances that set minimum standards of habitability. Other ordinances deal with fire and safety regulations that residential, commercial, and industrial property owners must follow. Many municipalities have enacted noise ordinances, which prohibit prescribed levels of noise after certain hours of the evening.
Ordinances may also deal with public streets and sidewalks. They typically include regulations regarding parking, snow removal, and littering. Restrictions on pets, including "pooper scooper" and leash laws, are also governed by municipal ordinances.
One of the most significant areas of municipal law is Zoning. Zoning ordinances constitute a master plan for land use within the municipality. A municipality is typically divided into residential, commercial, and industrial zoning districts. Zoning attempts to conserve the value of property and to encourage the most appropriate use of land throughout a particular locality.