
In 1969, 3M established a major factory in Cynthiana, KY, and they developed Post-it notes in 1972.
Up until just a few years ago, every Post-it Note on Earth, from North Dakota to Brussels to Taiwan, was manufactured in Cynthiana. After the patents expired, a few other companies have made knock-offs, but today, the Cynthiana 3M plant still accounts for nearly all of the world's production of Post-it Notes.
