The Marion County Courthouse on the public square is the most visible landmark in downtown Marion — a large Second Empire structure with a central clock tower, built in 1884 and expanded in subsequent decades. The building's elaborate Victorian detailing, including its mansard roof and decorated cornices, gives it a presence that stands in pleasing contrast to the more modest commercial buildings around it.
The courthouse square functions as the social centre of downtown Marion and is the location of the annual Popcorn Festival each September, which transforms the surrounding streets into one of the largest festivals in central Ohio. The festival has been running since 1969 and draws visitors from across the state.