Joseph A. Connors, 74, a retired special agent with the FBI and a former vice president and sales director of the Boss & Phelps real estate concern, died May 28 at his home in Washington after a heart attack.

Mr. Connors joined the FBI as a clerk in 1929. After becoming a special agent, he worked in offices in Georgia, Indiana and California in addition to the Washington field office, where he spent most of his career. After retiring from the bureau in 1968, he joined Boss & Phelps, where he worked until retiring a second time in 1981.

Mr. Connors was a native of Washington and graduate of St. John's College High School. He earned undergraduate and law degrees at George Washington University.

He had been a member of Annunciation Catholic Church in Washington since 1955. He also was a member of the Holy Name Society and the Society of Former Special Agents of the FBI.

Survivors include his wife of 39 years, Rita, of Washington; two sons, Joseph A. III, of McAllen, Tex., and Frank, of Houston; six daughters, Rita M. Reardon of Bethesda, Jane Columbia of Arlington, Claire McEnrue of Houston, and Mary C. Patsel and Mary C. and Anne Connors, all of Washington; two brothers, J. Leo, of Adelphi, and the Rev. Albert J., of Bellevue, Wash.; three sisters, Helen C. Mainuli of Hartford, Conn., and Kathleen C. Clements and Mary V. Connor, both of Washington, and 12 grandchildren.