Helen Claxton Walker, 84, a member of the Maryland State Board of Education from 1948 to 1955 who was active in charitable and civic organizations in Montgomery County, died of cardiac arrest Tuesday at the Carriage Hill nursing home in Bethesda.

She had lived in Chevy Chase since the early 1920s. She was president of the Chevy Chase Elementary PTA in 1937 and the Leland Junior High PTA in 1940. Mrs. Walker was appointed to the Montgomery County School Board in the early 1940s and was its president in 1947. She was appointed to seven-year term on the State Board of Education by former Gov. William Preston Lane Jr.

Mrs. Walker also was a founding trustee of Montgomery Junior College.

She was president of the Crippled Children's Society of Montgomery County in the mid-1950s and had been active in the Montgomery County Women's Democratic Club. She was member of the Chevy Chase Club.

Mrs. Walker was born in Greensboro, N.C., and came to Washington in 1910, when her father, Dr. Philander P. Claxton, was appointed U.S. Commissioner of Education. Mrs. Walker was a graduate of the old Western High School and attended the Women's College of North Carolina.

Her husband, Curtis Walker, died in 1957. Mrs. Walker's survivors include two sons, Claxton, of Potomac, and John C. III, of Chevy Chase; three sisters, Claire C. Mayo of Knoxville, Tenn., Elizabeth C. Lewis of Winter Park, Fla., and Mary Payne Claxton Pierce of McLean; a brother, Philander P. Claxton of Bethesda; 13 grandchildren and five great-grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Crippled Childrens Society of Montgomery County, 1000 Twinbrook Pkwy., Rockville, Md.