Home Stephens McAllister, 84, a longtime resident of the Washington area who was active in church, civic and genealogical groups, died of cardiac arrest and pneumonia Wednesday at Washington House, a retirement home in Alexandria.

Mrs. McAllister, who had arthritis, had lived at Washington House since 1972.

She first came to Washington about 1923 following her marriage to Addams Stratton McAllister, who became the assistant director of the National Bureau of Standards. She was a member of St. Alban's Episcopal Church and taught in its Sunday School. She was an area chairman in Community Chest drives and a Red Cross volunteer during World War II. She was a member of the Chevy Chase Women's Club.

She also was regent of the Livingston Chapter of the Daughters of the American Revolution and served as the D.C. state conservation chairman of the DAR. She was a member of the State Officers Club of the DAR.

Mrs. McAllister also was a genealogist and was a member of the National Genealogical Society. She was an officer of the Americans of Royal Descent and a member of the Daughters of the Barons of Runnymede.

From the time her husband retired from the National Bureau of Standards in 1944 until 1972, Mrs. McAllister lived in Covington, Va. There she was president of two family concerns, McAllister & Bell Inc., a flour company, and A.A. McAllister Sons Company, a real estate firm.

Mrs. McAllister was born in Philadelphis and grew up there. She later moved to New York City, where she was secretary for publishing houses and where she met her husband. He died in 1946.

Survivors include one son, Dr. Addams Stratton Jr. of Germany; four daughters, Judy M. French of Rockville, Home M. Reitwiesner of Silver Spring, Lydia M. Mefford of Bluemont, Va., and Sarah M. Thrash of Salisbury, Md.; one sister, Edith S. Rodman of Medford, N.J., 10 grandchildren and one great-granddaughter.

The family suggests that expressions of sympathy be in the form of contributions to a charity of one's choice.