Francis J. Eckloff, 66, who retired last year as Washington regional manager for the Kraft Inc. Dairy Group, died of cancer Monday at Suburban Hospital in Bethesda.

A fourth-generation Washingtonian, Mr. Eckloff graduated from Western High School. He worked as a route man for Sealtest Foods and then was a member of the Washington police force for about 10 years. In the late 1940s, he returned to Sealtest, which now is known as the Kraft Inc. Dairy Group.

Mr. Eckloff, who lived in Damascus, also had operated a real estate business there for the last 10 years. He was a member of the Montgomery County Board of Realtors and a past president of the Damascus Chamber of Commerce and Rotary Club.

He also was a founding member and senior warden emeritus of St. Anne's Episcopal Church in Damascus.

Survivors include his wife, Winifred Thompson Eckloff, of the home; two daughters, Bonnie E. Probst, of Monrovia, Md., and Mary Jo Sellers, of Leesburg, Va.; a sister, Katharine E. Carr, of Breezy Point, Md.; a brother, James E., of Bethesda, and two granddaughters.

The family suggested that expressions of sympathy be in the form of contributions to the Francis J. Eckloff memorial building fund at St. Anne's Episcopal Church.