The first settlers arrived in Morrison, Illinois in 1831, and the town was officially platted in 1855. It was named after John H. Morrison, a wealthy merchant from New York. Although the process toward incorporation began in 1857, Morrison was formally incorporated under Illinois state law in 1873, marking an important step in the city’s development.
One of the key factors in Morrison’s growth was the arrival of the Galena–Chicago Railroad. Originally, plans called for the railroad to pass through the nearby town of Unionville, with Morrison serving only as a stop along the line. However, Unionville requested a high payment for the railroad’s right-of-way through the town. As a result, the privately funded railroad company chose to reroute the line through other communities, including Morrison. Although the new route ultimately cost more than the original plan, the decision proved beneficial for Morrison, helping establish the city as a transportation hub and encouraging long-term economic growth.
Morrison also played an important role in local government history. For two decades, the town competed to become the county seat of Whiteside County. In 1857, Morrison successfully won the bid and has served as the county seat ever since, solidifying its importance as the administrative and civic center of the county.