Charles W. Johnson Sr., 57, an assistant home delivery manager of The Washington Post, died Thursday at the Washington Hospital Center. He had cancer.

Mr. Johnson was born in Louisa County, Va., and grew up there and in Washington. He graduated from Cardozo High School and served in the Army Air Corps during World War II.

After the War, he returned to Washington. For the next 12 years, he worked for the Bureau of the Census and was a supervisor in the typing pool when he resigned. He then was a flower arranger for a florist in Takoma Park.

For many of those years, Mr. Johnson was a parttime distributor of The Post. In 1966, he became a fulltime distributor and in 1971 became an assistant home delivery manager. He received several citations for his work with the newspaper.

Mr. Johnson was a member of the Paramount Baptist Church in Washington.

Survivors include his wife, Elizabeth, of Washington; one daughter, Beverly Sellers, of Takoma Park; five sons, Charles W. Jr., of Hyattsville, Reginald, of Takoma Park, and Larry, Lawrence and Michael, all of Washington; one brother, Jesse Johnson, of Washington; one stepson, William Barbour, of Forestville; 13 grandchildren, 10 stepgrandchildren, and one great-grandchild.