Everett Monsour, 63, a retired official of the Postal Service who had been a sales agent with the Shannon & Luchs real estate firm in Kensington for the past five years, died Tuesday at Holy Cross Hospital in Silver Spring after a stroke.

Mr. Monsour began his government career about 1939 as a railway mail clerk and personnel assistant with the old Post Office Department's Railway Mail Service in Pittsburgh. He transferred to Washington about 1960 and retired as manager of the Postal Service's design branch in 1971.

He then worked as an independent engineering consultant and as a supervisor with ROHR Industries here before joining Shannon & Luchs.

Mr. Monsour was a native of Pennsylvania and a resident of Rockville. He was a graduate of the Carnegie Institute of Technology and served in the Navy during World War II.

He was a member of the Wheaton Post of the American Legion and the Rotary Club.

Survivors include his wife, Harriet E., of Rockville; three sons, Paul D., of San Francisco, and Nicholas R. and Dr. Roy E., both of Gettysburg, Pa.; three brothers, Edward, of Pittsburgh, Peter, of Claremont, Calif., and Paul, of El Monte, Calif.; three sisters, Catherine Shogry of Detroit, Caroline Ayoub of Greensburg, Pa., and Beatrice Davis of Bethel Park, Pa., and three grandchildren.