Mary C. Schloeder, 62, a State Department librarian and resident of Alexandria who was active in church groups, died of cancer Saturday at Alexandria Hospital.

Mrs. Schloeder began her career as a librarian with the D.C. Public Library in 1951. She became a librarian at the State Department in 1956, where she worked until transfering to the Library of Congress in 1961. She returned to the State Department in 1963. At the time of her death she was chief librarian of the State Department's Foreign Service Institute.

She was a member of the Blessed Sacrament Catholic Church in Alexandria. From 1961 to 1963, she was president of the Alexandria Deanery's Council of Catholic Women. Between 1963 to 1969 she served two-year terms as parliamentarian and then historian of the Council of Catholic Women of the Richmond Diocese.

Mrs. Schloeder was a native of Kansas City, Mo., and came to this area in 1942. She was a graduate of St. Mary College in Leavenworth, Kan., and earned a master's degree in library science at Catholic University.

She was a member of the Special Libraries Association, and the D.C. Library Association.

Her husband, Elmer M. Schloeder, died in 1961. Mrs. Schloeder's survivors include a daughter, M. Kathleen Schloeder of London and Alexandria, and a sister, Eleanor M. Higgins of Alexandria.

The family suggests that expressions of sympathy be in the form of contributions to the library building fund at St. Mary College, Leavenworth, Kan., 66048.