On December 20, 1842, Father John Dubois, founder of Mount Saint Mary's College (now University) and Seminary in Emmitsburg, died in New York City where he was a Roman Catholic bishop. He was born in Paris, France, on August 24, 1764.
On December 20, 1920, the last road tollgate in Maryland, on the Frederick and Woodsboro Road between Frederick and the Monocacy River, was closed. Miss Alice Zimmerman, toll collector for nearly 18 years, collected the last fee.
On December 20, 1946, The Frederick News-Post carried an article revealing that bobble birds, those glass figures that dipped their beaks into a container of water, were being manufactured in Frederick.