Maryland Statutes
Subtitle 2 - Rules of Construction
Section 1-202 - Residency

(a)    A person doing business in the State is deemed a resident of the State and of the county and any municipal corporation where the business is conducted if personal property is used in or in connection with the business.
    (b)    A personal representative of the estate of a decedent is deemed a resident of the county where appointed.
    (c)    A guardian is deemed a resident of the county where appointed.