When Union County was formed from portions of Delaware, Franklin, Madison and Logan Counties in 1820, it was decided that Marysville would become the new County Seat.
Marysville was named after its founder's daughter, Mary Cuthbertson. Samuel Cuthbertson was the founder of Marysville which was first laid out in 1816.
Reuben Partridge mural in downtown Marysville pays homage to the covered bridge builder that built over 125 bridges during his long career.
When William Henry Harrison made his run for President in 1840, he got the nickname as a log cabin hick. Well Harrison knew a gift when he saw it and he ran with that intended slight and he became known as the "log cabin" president. During the campaign Harrison visited Marysville where a miniature log cabin was built upon a wagon and paraded through the streets of Marysville before the long procession to Columbus for the state's political convention. To accompany the float, a song was created by Otway Curry of Marysville. (Ohio's Buckeye Cabin Song) He even played the song as he sat on the front porch of the float's cabin. That song became one of two Harrison's theme songs that helped him win the election.