High Quality Content by WIKIPEDIA articles! The Ogle County Courthouse is a National Register of Historic Places listing in the Ogle County, Illinois, county seat of Oregon. The building stands on a public square in the city`s downtown commercial district. The current structure was completed in 1891 and was preceded by two other buildings, one of which was destroyed by a group of outlaws. Following the destruction of the courthouse, the county was without a judicial building for a period during the 1840s. The Ogle County Courthouse was designed by Chicago architect George O. Garnsey in the Romanesque Revival style of architecture. The ridged roof is dominated by its wooden cupola which stands out at a distance.