Ralph S. Jordan, 67, a retired lieutenant colonel in the Air Force and a former employe of Fairfax County, died Sunday at the Bethesda Naval Medical Center. He had cancer and emphysema.

Col. Jordan, who was born in Washington, graduated from McKinley Technical High School and the University of Maryland. In 1942, he enlisted in the Army Air Corps, received a commission and served in the China-Burma-India theater during World War II.

After the war, he served in the Panama, Germany and at various posts in the United States. He retired from the Air Force in 1963.

Col. Jordan, who lived in McLean, was a real estate broker with the Monroe Realty Co. in Fairfax. He later worked in the division of bonds and permits in the Fairfax County government for about four years before he retired in 1977. He then became a volunteer teacher's aide in the Fairfax school system.

Survivors include his wife, Thornton Jordan, whom he married in 1945, of McLean; a son, Bruce Jordan of Woodbridge; a brother, Richard A. Thornton of Bradenton, Fla., and a grandson.

The family suggests that expressions of sympathy be in the form of contributions to the American Cancer Society of Northern Virginia, P.O. Box 699, Vienna, Va., 22180.