Md. Const. IV - Judiciary Department § 19

The State shall be divided into eight Judicial Circuits, in manner following, viz: The Counties of Worcester, Wicomico, Somerset, and Dorchester, shall constitute the First Circuit; the Counties of Caroline, Talbot, Queen Anne’s, Kent and Cecil, the Second; the Counties of Baltimore and Harford, the Third; the Counties of Allegany, Garrett, and Washington, the Fourth; the Counties of Carroll, Howard and Anne Arundel, the Fifth; the Counties of Montgomery and Frederick, the Sixth; the Counties of Prince George’s, Charles, Calvert, and St. Mary’s, the Seventh; and Baltimore City, the Eighth.