Mangum Weeks, 82, a former government lawyer long active in Alexandria civic affairs, died Wednesday at Alexandria Hospital after a long illness.

Mr. Weeks, a member of the District of Columbia Supreme Court bars, was a government lawyer from the 1920s until his retirement in 1960.

He was an assistant solicitor at the State Department and a lawyer with U.S. Tax Court, the Farm Loan Board, the War Department and the Justice Department.

While at theJustice Department, he helped settle claims of Japanese displaced during World War II.

Born in Washington, Mr. Weeks earned Phi Beta Kappa honors and graduated from the University of North Carolina in 1915. He then attended Johns Hopkins University and Harvard Law School.

In the 1930s and early 1940s, he taught federal tax law at the old Washington College of Law, now part of American University, and constitutional law at the old Columbia Law School, now part of Catholic University.

He was a charter member and director of the Alexandria Association for Historic Preservation, a founder and early member of the Historic Alexandria Foundation and a life member of the Alexandria Library Co., which lent books to the public before the pubic library system was founded.

In 1957, he was instrumental in restoring annual public lectures by the library group, which had been discontinued during the Civil War. He also served as a citizen member of Alexandria City Council committees on preservation of Old Town.

Mr. Weeks was a member of the Northern Virginia Ornithological Society and an associate member of the American Ornithological Union.

In addition to his wife, Josephine, of the home, he is survived by a sister, Preston Weeks of Washington.