The Bar Association of Frederick County was created in 1923; however, members of the Frederick Bar held meetings before then - as early as 1872, as evidenced by this document from the BAFC archives:
W. Clinton McSherry called together the 30 members of the Frederick County Bar to meet at the Courthouse on January 22nd, 1923 at 2:30pm with the purpose of forming the Bar Association of Frederick County. Here are the minutes from that meeting: