Modean E. Parker, 57, a retired statistical assistant at the U.S. Census Bureau, died of cancer Thursday at George Washington University Hospital.

Mrs. Parker was born in Proctor, Ark., and grew up there and in St. Louis, Mo. She graduated from the old St. Joseph High School for Negroes in St. Louis in 1941 and also attended Tucker's College. She moved to Washington in 1942.

Her first job here was as a clerk-typist in the Adjutant General's Office of the old War Department. In 1946, she resigned to raise her family. She joined the Census Bureau in 1953 and received a number of incentive awards in the course of her career there. She retired last December.

Mrs. Parker, who lived in Washington at the time of her death, was a member of the Decimalettes, a social club. She also was a member of the parish of the Holy Comforter Catholic Church.

Her marriage to Robert Parker Jr. ended in divorce.

Survivors include two children, Edwin C. and Barbara Hill, both of Washington, two sisters, Wilhelmina Shepherd and Saverta Smith, both of Detroit, and four grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the National Cancer Institute, NIH, Bethesda.