Md. Code, Business Regulation § 17-909
§17–909.
(a) A peddler license authorizes the holder to act as a peddler only in the county where the peddler license is issued.
(b) In Harford County, a peddler may not sell goods on:
(1) a county right-of-way; or
(2) a State right-of-way, unless the peddler gets a lease agreement from the appropriate State unit.