Maryland Code, State Government § 22-203

(1) name;

(2) position classification;

(3) unit;

(4) home and work site addresses where the employee receives interoffice or United States mail;

(5) home and work site telephone numbers;

(6) work e-mail address; and

(7) position identification number.

(d)(1) Except as provided in paragraphs (2) and (3) of this subsection, an exclusive representative shall consider the information that it receives under this section as confidential and may not release the information to any person.

(2) An exclusive representative may authorize third party contractors to use the information that it receives under this section, as directed by the exclusive representative, to carry out the exclusive representative's statutory duties under this title.

(3) An exclusive representative or an authorized third party contractor may use the information that it receives under this section for the purpose of maintaining or increasing employee membership in an employee organization.

(4) On written request of an employee, an exclusive representative shall withhold further communication with the employee unless otherwise required by law or the written request is revoked by the employee.