Helendeen H. Dodderidge, 91, a retired chief of consumer services in the marketing division of the Department of Agriculture, died of cardiac arrest Tuesday at George Washington University Hospital.

Mrs. Dodderidge was born in Council Grove, Kan. She graduated from Emporia (Kan.) State Teachers College and then taught school briefly. She later earned a degree in journalism from Kansas State University.

She was active in Democratic Party politics in her home state before moving here in 1933 at the beginning of President Franklin D. Roosevelt's first term.

She began her career at Agriculture that year as an information official. She later was named head of consumer services in the marketing division and traveled widely in the United States, speaking and writing on consumer topics. She retired in 1953.

She was a life member of the Washington Press Club, a member of the American Newspaper Women's Club, and a founding member of American Women in Radio and Television. She also belonged to the Daughters of the American Revolution, the Women's National Farm and Garden Association and the Pan-American Liaison Committee of Women. She was a member of all Souls Memorial Episcopal Church in Washington.

Her husband, Harry A., died in 1959.

Survivors include two sons, William H., of Bethesda, and Robert r.. of Myrtle Hall Farm, Bluemont, Va., and six grandchildren.