Maryland's present constitution was ratified September 18, 1867, but has been amended approximately 200 times. The General Assembly can propose amendments to the Maryland Constitution. Each amendment must be proposed in a separate bill, embodying the constitutional article or section. Amendments must first be approved by three-fifths of all the members elected to each of the two houses of the General Assembly, then published in newspapers around the state and approved by a majority of Maryland voters. Md. Const. art. XIV, § 1.
Every 20 years (beginning in 1970), as part of the general election, Maryland voters must decide whether to call a constitutional convention for the drafting of a new constitution. If such a convention is called, any draft constitution it produces must be approved by a majority of Maryland voters. Md. Const. art XIV, § 2.
Maryland had three other constitutions before the Constitution of 1867: 1776, 1851, and 1864.