Burr N. Johnson Jr., 66, president of a real estate company and a Washington realtor for 34 years, died Friday at the National Naval Medical Center in Bethesda. He had diabetes.

Mr. Johnson began working as a real estate salesman in 1946 for the W.C. and A.N. Miller Development Co. here. In 1952, he became a sales manager and supervisor of Washington and Maryland sales for Marsteller, McCabe and Co. Inc. here. Two years later, he established his own firm here, which specializes in the sale of residential properties.

Mr. Johnson enlisted in the Army Air Forces in 1942 and served with the 9th Air Force in Europe in World War II. He also was a special service officer attached to Supreme Headquarters, Allied Expeditionary Force (SHAEF) in Europe. He received a battlefield commission as a major.

Mr. Johnson was born in Syracuse, N.Y., and attended Syracuse University. He also attended the old Alexander Hamiltion Institute in Binghamton, N.Y.

He lived in Westmoreland Hills, and maintained another home in Pompano Beach, Fla.

He was a member of the Washington Real Estate Board, the membership committee of the Metropolitan Washington Board of Trade and the advisory board of Union First National Bank.

Survivors include his wife, Frances S., a son, Kelly T., and two daughters, Wendy S. and Tracy J., all of Westmoreland Hills; another son, Peter E., of Provo Utah; another daughter, Nancy J. Miller of Atlanta; a sister, Melba J. Hodge of Bethseda, and three grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Endowment Fund at St. Alban's School for Boys in Washington.