Maryland Code, Local Government § 21-505

(a) Unless otherwise provided in the charter, bylaws, or code of a county, before the governing body of a county enacts an ordinance or resolution that establishes a special taxing district, authorizes the issuance of bonds, or imposes ad valorem or special taxes under this subtitle, the governing body shall:

(b) Before a county may establish as a special taxing district an area that is wholly or partly within a municipality or other county listed in § 21-502(a) of this subtitle, the county shall get the consent of the governing body of the municipality or another county.