Wilson H. Grabill, 70, a retired official of the Census Bureau who had been secretary of the board of trustees of Gallaudet College since 1964, died of cancer Jan. 30 at the Regency nursing home in Forestville, Md. He lived in Clinton, Md.

Mr. Grabill retired from the Census Bureau in 1975 after 41 years of service. For the last 12 of those years, he was chief of the family and fertility statistics branch of the population division. He received the Commerce Department's Gold Medal.

He was a member of the boards of the Population Association of America and the U.S. national committee of the International Union for the Scientific Study of Population.

Mr. Grabill was born in Evansville, Wis. He graduated from Gallaudet College and received a master's degree in statistics from American University.

Mr. Grabill, who was deaf, helped establish the National Health Care Foundation for the Deaf, an organization aiding institutionalized deaf persons to adjust to the outside world.

He was a member of the St. Barnabas Mission to the Deaf of St. John's Episcopal Church in Chevy Chase and the Alexandria-Potomac Lions Club.

Survivors include his wife, the former Edna Harbin, of Clinton; a son, Michael, of Edgewater; a sister, Suzanne Hoelter, of Milwaukee, and one grandchild.