After the 1960 census, Maryland was apportioned an eighth representative, an increase of one over its 1950 to 1960 apportionment. From 1963 to 1967, the state kept the seven districts it had used since 1953 and used an at-large representative. After 1967, however, eight districts were drawn and the at-large district was eliminated.

Democrat Carlton R. Sickles was the sole at-large representative.

• Martis, Kenneth C. (1989). The Historical Atlas of Political Parties in the United States Congress. New York: Macmillan Publishing Company.
• Martis, Kenneth C. (1982). The Historical Atlas of United States Congressional Districts. New York: Macmillan Publishing Company.
• Congressional Biographical Directory of the United States 1774–present

• The Montgomery County Committee for Fair Representation was a branch of the State Committee for Fair Representation. Active from 1960-1968, it helped in the change of apportionment in the Maryland General Assembly. Its records are located at the University of Maryland Libraries.