Md. Code, State Government § 18–217

(a) The official stamp of a notary public shall:

(1) include:

(i) the notary public’s name and office;

(ii) 1. if the notary public resides in the State, the county in which the notary public resides; or

2. if the notary public resides outside the State, the county in which the notary public was qualified; and

(iii) any other information required by the Secretary of State; and

(2) be capable of being copied together with the record to which it is affixed or attached or with which it is logically associated.

(b) A notary public commissioned under the laws of this State shall include in the notary public’s official stamp or within a certificate of notarial act the expiration date of the notary public’s commission as a notary public.

(c) A notary public’s official stamp is a public seal.