Sadie Hamilton Welch, 72, a retired transportation officer at the Agency for International Development who was the organist and choir director at her church, died of Cancer Tuesday at Holy Cross Hospital in Silver Spring.

Born and reared in Washington, Mrs. Welch graduated from Dunbar High School and the old Miner Teachers College. She also attended Howard University's school of music.

She was a teacher in Virginia for several years before beginning her federal career in 1936 with the Government Printing Office. During World War II, she worked for the Office of Price Administration.

About 1950, she transferred to the State Department. She joined AID after it was established in 1961 and was a transportation officer there when she retired in 1970. She received a State Department commendation medal at that time.

Mrs. Welch, who lived in Silver Spring, was a member of the John Wesley AME Zion Church here for 44 years. She served as the church's minister of music, choir director and organist and was an officer and member of the organ guild.

She also served as assistant director and accompanist of the "Men-O-Tones-Trebletones," a local religious singing group, for 20 years.

Survivors include her husband, Edward J. Welch Jr. of Silver Spring, a daughter, Annette Mitchell of Washington, Three grandchildren and one great-grandchild.

The family suggests that expressions of sympathy be in the form of contributions to the Howard University Center for Sickle Cell Disease.