Dr. Harry C. Trelogan, 76, the first administrator of the Statistical Reporting Service in the Department of Agriculture and the founder of its Washington Data Processing Center, died of cardiopulmonary arrest Feb. 8 at the Carriage Hill nursing home in Arlington.

Dr. Trelogan, who lived in Arlington, was born in Versailles, Pa. He graduated from West Virginia University and completed master's and doctoral degrees in agricultural economics at the University of Minnesota.

In 1938, he moved to Washington and began his career at Agriculture. Much of his work involved dairy science and marketing, and he became assistant administrator of the Agricultural Marketing Service. In 1961, he was named administrator of the Statistical Reporting Service; he continued in that post until his retirement in 1975.

From 1948 to 1975, he also taught at the Department of Agriculture Graduate School and for seven years was a member of its general administration board.

Dr. Trelogan was coauthor of "Agricultural Market Prices," which appeared in 1951. He contributed to other books and journals.

His honors included Agriculture's superior and distinguished service medals, the 50th anniversary commemorative medal for the Federal Land Bank and honors from West Virginia and Minnesota universities.

Dr. Trelogan was a fellow and a past president of the American Agricultural Economists Association and a fellow of the American Association for the Advancement of Science and the American Statistical Association. He was a life member of the International Association of Agricultural Economists and a member of the American Dairy Science Association, the American Economic Association, the Agricultural Research Institute, the International Statistical Institute, the National Economists Club and the Cosmos Club.

Survivors include his wife, Ruth, of Arlington; three children, Robert of Washington, Peter of Reston, and Jeanne Trelogan-Nutter of Fairfax; a sister, Edith Webster of Honolulu; a brother, Charles of Asheville, N.C., and four grandchildren.