Donna Copeland Lynn, 64, who retired from the old Crime Records Division of the FBI in 1971 after 30 years of service with the agency, died of cancer Wednesday at her home in Falls Church.

Mrs. Lynn, who was born in Logan, Iowa, was a 1938 graduate of the University of Iowa. She was a schoolteacher in Moville and Odebolt, Iowa, before moving to Washington in 1941 and joining the FBI as a junior file clerk in the Identification Division.

During World War II, the agency's fingerprint files were transferred to the D.C. Aromory and Mrs. Lynn worked there. She was promoted to supervisor-instructor in 1943, and in 1949 was appointed librarian of the FBI library. In 1951, she transferred to the Crime Records Division, now known as the Office of Congressional and Public Affairs. Her duties included preparing answers to inquiries addressed to J. Edgar Hoover, the late director of the FBI.

In 1966, Mrs. Lynn received a commendation from Hoover for "services that led to the identification of the unknown subject in an extortion case." Mrs. Lynn linked an unrelated inquiry with a suspect under investigation by the bureau.

Her husband, Aubrey Jackson Lynn, died last November.

Survivors incude two stepchildren, Aubrey Jackson Jr., of Alexandria, and Letitia Virginia Lombardelli of Hermosa Beach, Calif.; her mother Libbie M. Copeland of Logan; two brothers, Dr. Walter. R. Copeland of Des Moines, and Joe F. Copeland of Bartlesville, Okla., and two grandsons.

The family suggests that expressions of sympathy be in the form of contributions to the Hospice of Northern Virginia, 4715 N. 15th St., Arlington.