Frank Edwin Williams, 77, the former owner and president of Rockmont Chevrolet in Rockville, died of congestive heart failure July 20 at a hospital in Thomasville, Ga.

Mr. Williams had managed Rockmont Chevrolet for almost 40 years when he retired in 1987, and he had been active in a variety of civic and business organizations in Rockville.

In the 1950s, he served on the Rockville City Council, and he was a former president of the Rockville Rotary and the Rockville Chamber of Commerce. He was a deacon, elder and trustee of Rockville Presbyterian Church and a member of Columbia Country Club.

He was born in Baltimore and moved to Rockville in 1936. He graduated from Dartmouth College.

During World War II, he was a volunteer with the British Army in North Africa, then served with the U.S. Army in France, Belgium and Germany.

He graduated from the University of Maryland Law School and in 1948 was admitted to the Maryland Bar.

That year he also began his career at Rockmont Chevrolet, a family business which had been operated by his father.

Mr. Williams was a former president of the Automotive Trade Association of the National Capital Area and a director of the Automobile Trade Association of Maryland.

He was a director of Farmers Banking and Trust Co. Later, following a merger, he was chairman of the regional advisory board of First National Bank of Maryland. He was a director of Chestnut Lodge Inc.

In 1994 Mr. Williams moved to Thomasville. He also had a home in St. Michaels, Md.

Survivors include his wife, Marianne Watt Jeffries Williams of Thomasville; three children, Frank E. Williams IV of Augusta, Ga., Emily Williams Kelly of Chapel Hill, N.C., and Marianne Hansell McCallum of Rockville; a sister, Alice Williams Hinman of Winston-Salem, N.C.; and eight grandchildren.