William Blount, 55, an assistant superintendent for northern area public schools in Prince George's County, died of cancer Friday at Washington Adventist Hospital in Takoma Park.

A teacher and administrator in Prince George's County for 26 years, he was the highest ranking black administrator in the Prince George's public school system, a school spokesman said. Mr. Blount was responsible for supervising and managing 69 elementary, junior and senior high, and vocational and evening schools.

Superintendent of schools Edward J. Feeney, who brought Mr. Blount into the top levels of the school system's administration, described him as a "true teacher," who "loved children and the things he could do with them as their teacher."

Board of Education Chairman JoAnn T. Bell said Mr. Blount was "one of a kind, a man who loved his job and made the people around him see the value of their lives and the good in their work. We will surely miss him very much."

Mr. Blount began his career in Prince George's County as an industrial arts instructor in 1954. He later joined the school system's pupil personnel service as a visiting teacher. In 1968, he was appointed vice principal of Mary McLeod Bethune Junior High School.

During the next four years, he served as vice principal of Bladensburg and Largo senior high schools. He was principal of Suitland Junior High School from 1972 to 1975, when he became principal of Northwestern Senior High School.

In 1978, Mr. Blount was the first black to be appointed an administrative assistant to the superintendent of schools, according to the school spokesman. He was appointed an assistant superintendent the following year.

Mr. Blount was born in Grantville, Ga. He earned a bachelor's degree from Tuskegee Institute in Alabama and a master's degree in education from the University of Maryland. He did postgraduate work at the University of Minnesota, Howard University and Bowie State College. He lived in Beaver Heights, Md.

Survivors include his wife, Hermene, a son, William L., and a daughter, Joyce E., all of Beaver Heights; two other sons, Ronald A., of Boston, and Michael W., of Washington, and his mother, Lonella Reese of Atlanta.