In municipalities with up to 200,000 voters the first-past-the-post system is used, while in municipalities more than 200,000 the two-round system is used, in compliance with article 77 of the Constitution.The Municipality will be governed by an organic law, voted in two rounds, with a minimum intersection of ten days, and approved by two thirds of the members of the City Council, who will promulgate it, in compliance with the principles established in this Constitution, in the Constitution of the respective State and the following precepts: