John F. Miller, 91, former president of the National Planning Association, died of congestive heart failure Dec. 28 at the Friends retirement facility in Sandy Spring.

Mr. Miller retired in 1979 after eight years as president of the National Planning Association, a private, nonprofit research organization. He joined the organization, now known as the National Policy Association, in 1943.

Mr. Miller was born in Canton, Ill., and graduated from the University of Illinois, where he also received a master's degree in political science.

He was an exchange fellow at Frankfurt University in Germany and also did postgraduate study at Columbia before moving to Washington in the mid-1930s to work on the President's Committee on Administrative Management.

Mr. Miller was a consultant on the committee on civil service improvement.

In 1938, he joined the National Resources Planning Board, where he was chief of field service. When the board was abolished in 1943 he moved to the National Planning Association, where he continued to work periodically after stepping down as president.

Mr. Miller was a founder of Burgundy Farm Country Day School in Alexandria. He was a co-founder and co-secretary of the Canadian-American Committee and the British-North American Committee.

About 15 years ago, Mr. Miller moved to Chocorua, N.H., but returned to Sandy Spring during the winter months.

Survivors include his wife, Ruth R. Miller of Sandy Spring; three children, Joan Willis of California, Kent R. Miller of Philadelphia and Dana R. Miller of New York; and four grandchildren.