On August 18, 1865, Hiram Winchester, the first president of The Frederick Female Seminary, resigned after 19 years in the post.
On August 18, 1883, The Washington Monument on South Mountain was rededicated after being refurbished and its height raised.
On August 18, 1896, the first passenger trip of the Frederick & Middletown Railway to Braddock Junction, which was at the site of the present day Episcopal Church of The Transfiguration, was made.
On August 18, 1940, W. Clinton McSherry, James McSherry, John Motter and Charles U. Price, all later prominent Frederick citizens, narrowly escaped drowning in the Potomac River at Seneca.