Betty Carr, 64, active in civic and political affairs, died Thursday at Suburban Hospital following a stroke.

She had worked as a fund-raiser for both the national 4-H center in Chevy Chase and for Georgetown University in the 1960s and early 1970s. She was also a volunteer worker for the Democratic National Committee in Washington.

Mrs. Carr was a charter member and volunteer worker in the Montgomery County Society for the Prevention of Cruelty to Animals. She was also a member of the Bethesda Presbyterian Church for nearly 40 years.

Born in Cleveland, she graduated from the Hathaway-Brown school there, and earned a bachelor's degree from Erskine College in Boston, before moving to this area in 1940.

She was the wife of the late Richard J. Carr, an attorney with the Federal Trade Commission, who died in 1964.

Mrs. Carr is survived by two daughters, Diane C. Greco, of Pittsburgh, and Michal Brand Carr, of Washington; a sister, Pauline B. Buel of Gaithersburgh; two brothers, Ewing W. Brand, of Vero Beach, Fla., and Carl W. Brand, of Cockeysville, Md., and three grandchildren.

The family suggests that expressions of sympathy may take the form of contributions to the Montgomery Country SPCA, P.O. Box 471, Rockville, Md.