According to the Base law of Municipalities, these entities are classified in to Provincial Municipalities and District Municipalities. The provincial municipalities also have functions pertaining to the provincial seat which is the capital district. Rural municipalities (those whose seat has an urban population less than 50% the total) receive different classification.
They are composed of two entities, the council and the mayor. The council, made up of the mayor and elected officials, is normative and. The mayor's office however, is the executive power.
The election of the mayor and council is held by universal suffrage for a period of three years. The number of council members is defined by the National Jury of Elections according to Laws of Municipal Elections.