Frank Del Balzo, 66, a retired assistant journal clerk of the U.S. House of Representatives and a former member of the Capitol Police, died at the Washington Hospital Center Tuesday following heart surgery.

Mr. Del Balzo, who was born in Annapolis and grew up in New York City, moved to Washington in 1939 and joined the Capitol Police. During World War II, he served in the Army and was stationed in Alaska and Canada. Aftter the war, he returned to the Capitol Police.

About 1955, he joined the staff of the Office of the Clerk of the House. In the early 1960s, he was promoted to assistant journal clerk and held that position until his retirement in 1973.

Mr. Del Balzo, who lived in Potomac, was a lifelong Democrat. At the time of his death, he was the treasurer of local Democratic precinct 4-23 in Potomac.

Mr. Del Balzo was a member of the Knights of Columbus, the Holy Name Society, the Veterans of Foreign Wars and the Naval Academy Athletic Association. He was a member of the parish of St. Raphael's Catholic Church in Rockville.

Survivors include his wife, Mary Jane, whom he married in 1942, of Potomac; four sons, Tony, of Fort Worth, Tex., Michael, who is serving in the Navy at Guantanamo Bay, Cuba, Vincent, of Bethesda, and Joseph, of Potomac, and three grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Community Health and Education Fund/Cardiology, Washington Hospital Center, Washington, D.C.