Mansfield was laid out by James Hedges, Joseph Larwell and Jacob Newman and platted in June 1808. It was named for Colonel Jared Mansfield, the U.S. surveyor general, who directed its planning. The plat was a square, today's public square, or Central Park. That year Samuel Martin built a log cabin on lot 97, where the H.L. Reed building now stands, the only house built in Mansfield in 1808. Martin wintered there and illegally sold whiskey to Native people, which forced him to flee, and James Cunningham moved in in 1809, when fewer than a dozen settlers lived in Richland County.
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During the War of 1812 two blockhouses were built on the public square, reportedly in a single night. After the war one of them served as the first courthouse and jail of Richland County until 1816 and later as a school, with Eliza Wolf as teacher. Mansfield became a village in 1828 and a city in 1857, with 5,121 people.
Railroads arrived between 1846 and 1863: the Sandusky, Mansfield and Newark in 1846, the Pittsburgh, Fort Wayne and Chicago in 1849 and the Atlantic and Great Western in 1863. With four railroads passing through, Mansfield was a manufacturing and trade center by the late 1880s, making brass goods, doors, linseed oil, paper boxes, suspenders and many other products, and its largest employer in 1888 was a cigar maker.
Sources
Wikipedia: Mansfield, Ohio