The top management of Perdue Farms Inc. of Salisbury has been reorganized. Frank Perdue has appointed himself chief executive officer and chairman of the board and named Donald W. Mabe to succeed him as president and chief operating officer.

Perdue, who will maintain control over the company he inherited from his father in 1950, also announced the formation of a new firm, Perdue Foods, which will specialize in fast food sales.

Perdue Farms is the Eastern Shore's largest poultry firm, selling 3 million chickens a week from Washington to Boston.

Mabe, who had been executive vice president, joined Perdue in 1957 as a broiler supervisor and has served in both operational and managerial positions.

Jack Patterson has been named senior vice president-circulation of The Washington Post. In addition to his circulation department responsibilities, Patterson will assist publisher Donald Graham in the general management of the newspaper.

Patterson joined The Post in 1952 as assistant circulation director, became circulation manager in 1954, circulation director in 1968 and vice president of circulation in 1974. He has served as circulation director of the Seattle Star, home delivery manager of the San Francisco Chronicle, circulation director of the Los Angeles Mirror and promotion director and assistant to the publisher of the San Antonio Light.

John C. Simpson has been promoted to executive vice president-treasurer and Robert K. Bowie has been promoted to senior vice president-secretary of American Federal Savings and Loan Association.