Maryland Constitution of 1867 Art. 11-F, § 7

Any action of a code county in the enactment, amendment, or repeal of a public local law is subject to a referendum of the voters in the county, as in this section provided. The enactment, amendment, or repeal shall be effective unless a petition of the registered voters of the county requires that it be submitted to a referendum of the voters in the county. The General Assembly shall amplify the provisions of this section by general law in any manner not inconsistent with this Article, except that in any event the number of signatures required on such a petition shall not be fewer than five percentum (5%) of the voters in a county registered for county and State elections.