Florence M. Sullivan, 54, active for many years in scouting and civic organizations, died Friday at St. Mary's County Hospital in Leonardtown, Md., after an apparent heart attack.

Born in Perth, Australia, she served as a nurse with the Australian Army in World War II. During this time she married Laurence E. Sullivan, who was serving with the U.S. Army in the Pacific. She and her husband moved to this area in 1946. He is president of Capital Plastics Co. in Kensington.

Mrs. Sullivan was active in the Girl Scouts, organizing and leading a number of troops in the Wheaton area. In 1969, she received an award from the scouts for 20 years of service.

Active in the Republican Party in Maryland for many years, she served as precinct captain in Montgomery County from 1968 through 1972.

Mrs. Sullivan also belonged to St. Mary's County Humane Society.

She is survived by her husband, of the home in Silver Spring; three daughters, Carole Ortmyer, of Catlett, Va., Yvonne Cannon, of Wheaton, and Leita Bennett, of College Park; two sons, Laurence E. Jr., of Hyattsville, and J. Timothy, of Wheaton; a sister, Yvonne Bolton, of Bunbury, Australia; a brother, William Radley, of Melbourne. Australia, and six grandchildren.

The family suggests that expressions of sympathy may take the form of contributions to the St. Mary's Humane Society, c o Jean Lundy, Piney Point, Md.