Ellard Clay Hollingsworth, 64, a budget officer with several federal agencies and with the District of Columbia government until his retirement in 1961, died Aug. 7 at Prince William Hospital in Manassas, Va., following a heart attack.

Mr. Hollingsworth had been active in civic affairs in Prince William County and Manassas since moving there in 1967.

He was born in St. Louis and grew up in Knoxville, Tenn. He began his U.S. career with the Tennessee Valley Authority in the 1930s. He served in the Army as a warrant officer in the ordinance branch in World War II.

He then attended the University of California at Los Angeles. He graduated in 1949 with a bachelor's degree in economics with highest honors.

He worked briefly for the old Atomic Energy Commission at Oak Ridge, Tenn., and then joined the State Department in Washington. He remained at State until 1957, when he transferred to the Department of Agriculture in Chicago. He returned to Washington the following year and worked for the D.C. government until his retirement.

Survivors include his wife, Edythe, of the home in Manassas, and his mother, Charlotte Casteel, and a sister, Marie Stork, both of Knoxville.