Maryland Code, Election Law § 3-306

(b)(1) When applying to register to vote on election day, the applicant shall provide proof of residency.

(2) The applicant shall prove residency by showing the election judge:

(c)(1) When an individual applies to register to vote at a precinct polling place on election day, the election judge shall determine whether the applicant resides in the precinct in which the applicant applied and is qualified to become a registered voter.

(2) If the voter is a resident of the precinct and is qualified to register to vote, the election judge shall:

(3) If the voter is a resident of the county but not the precinct, is qualified to register to vote, and chooses to vote in the precinct, the election judge shall:

(d)(1) Unless a local board elects to make the notification, the State Board shall take appropriate measures to notify potential registrants of the correct precinct polling place for the potential registrants' residence addresses before each election.

(2) The election judge shall notify an individual who applies to register to vote at the incorrect precinct for the voter's residence address of the correct precinct for the voter's residence address.