Thomas Garland Magruder Jr., 80, a retired journalist, realtor, and store owner who was active in Scottish organizations, died of cancer Friday in a hospital in Durham, N.C.

Mr. Magruder, who was born in Front Royal, Va., came to Washington in the 1920s after working as a reporter for papers in New York, Richmond, Baltimore, and Philadelphia.

In Washington, he worked for The Wall Street Journal, the old United Press and the old Washington Times Herald. He covered the White House and the State Department for the old Foreign Affairs News Service.

In 1941, he and his first wife, the former Katherine Duncan, founded their own realty company in Arlington. In 1959, they opened "Scotland House," an import business in Alexandria.

They sold Scotland House in 1970 and moved from Arlington to Williamsburg, where they opened Scotland House Ltd." Katherine Magruder died in 1973 and Mr. Magruder retired in 1977. He had lived in Siler City, N.C., since last June.

Mr. Magruder was a member of American Clan Gregor Society, the Scottish Historical Society, the Washington chapter of the St. Andrew's Society and the National Press Club.

Survivors include his wife, Rebecca, of Siler City; three children by his first marriage, Dr. Thomas G. III, of Omaha, Neb., Ruth Hanson of Urbana, Ill., and Jane McCartney of Oseola, Ark.; 10 grandchildren, and eight great-grandchildren.