Md. Code, Election Law § 3-305

(a) During early voting, an individual may appear in person at an early voting center in the individual’s county of residence and apply to register to vote or change the voter’s address on an existing voter registration.

(b) (1) When applying to register to vote during early voting, the applicant shall provide proof of residency.

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

(i) a Maryland driver’s license or Maryland identification card that contains the applicant’s current address; or

(ii) if the applicant does not have a driver’s license or identification card that contains the applicant’s current address, a copy of an official document that:

1. meets the requirements established by the State Board; and

2. contains the applicant’s name and current address.

(c) (1) When an individual applies to register to vote at an early voting center, the election judge shall determine whether the applicant resides in the county in which the applicant applied and is qualified to become a registered voter.

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

(i) issue the voter a voter authority card;

(ii) have the voter sign the voter authority card; and

(iii) issue the voter a ballot.

(d) (1) When a voter applies to change the voter’s address during early voting, the election judge shall determine whether the voter resides in the county in which the voter seeks to vote.

(2) If the voter is a resident of the county, the election judge shall:

(i) issue the voter a voter authority card;

(ii) have the voter sign the voter authority card; and

(iii) issue the voter the appropriate ballot for the voter’s new address.

(e) The State Board shall adopt regulations and procedures in accordance with the requirements of this section for the administration of voter registration during early voting.