Judith Strain Barton, 38, who was active in church, civic, and volunteer organizations in Arlington, died of hepatitis Tuesday at George Washington University Hospital.

Mrs. Barton was a volunteer mathematics tutor in the Arlington County public schools for the past eight years. She taught mostly at Jamestown Elementary.

She was a member of Arlingtonians for a Better County (ABC) and had been active in Democratic Party activities in Arlington.

Mrs. Barton was a member of the Unitarian Church of Arlington and was an active member of the church choir, with which she toured Scandinavian countries in 1976.

She was born in Schenectady, N.Y., and reared in Arlington. She was the 1959 valedictorian of Wakefield High School, was a 1963 graduate of Chatham College in Pittsburgh, where she was elected Phi Betta Kappa, and did graduate work in political science at the University of North Carolina.

Mrs. Barton had worked during the summer months between 1959 and 1964 as a computer programmer at the U.S. Navel Research Lab in Washington.

Survivors include her husband, Richard A. Barton, a member of the Arlington County School Board, a daughter, Jennifer L., and a son, Michael A., and her parents, Mr. and Mrs. Charles Victor Strain, all of Arlington, and a sister, Linda Kimsey of St. Petersburg, Fla.

The family suggests that expressions of sympathy be in the form of contributions to the Judith Strain Barton Memorial Fund at the Unitarian Church of Arlington.