On June 18, 1856, John Llewellyn Johnson, who became managing superintendent of The Union Manufacturing Company of Frederick, was born in Philadelphia. He died in Frederick on June 27, 1922.
On June 18, 1967, President Lyndon B. Johnson and Australian Prime Minister Harold Holt attended Sunday services at Harriet Chapel Episcopal Church at Catoctin Furnace.
On June 18, 1992, James E. Tucker, the hearing-impaired director of admissions at Gallaudet University in Washington, D.C., was named superintendent of The Maryland School for The Deaf, succeeding Dr. David Denton.
On June 18, 2005, David A. Reed, who donated his estate, valued at more than $1 million to the Historical Society of Frederick County (now Heritage Frederick), died in Washington, DC. He was born August 13, 1929, in Frederick.