The Sycamore Historic District is a meandering area encompassing of the land in and around the downtown of the DeKalb County, Illinois county seat, Sycamore. The area includes historic buildings and a number of historical and Victorian homes. Some significant structures are among those located within the Historic District including the DeKalb County Courthouse and the Sycamore Public Library. The district has been listed on the National Register of Historic Places since May 2, 1978. There are over 200 properties within the irregular boundaries of the Sycamore Historic District. Of those, 187 are considered contributing properties to the historic district, and 22 are non-contributing. Of all of the district's homes and buildings 75% fit within the historic district concept. Some of the major structures include several prominent Queen Anne style mansions, the Sycamore library, the DeKalb County Courthouse, and dozens of mid- to late 19th-century houses. History The 1966 National Historic Preservation Act, which created the National Register of Historic Places, empowered individual states to create review boards to function with the state historical preservation officer. Illinois did not create its historic preservation program until the early 1970s, under the direction of the Illinois Department of Conservation. The Department of Conservation dispatched field surveyors to all Illinois counties to find anything that might qualify for inclusion on the National Register of Historic Places. The field surveyor who traveled to Sycamore in 1973 found a large number of late 19th and 20th century examples of architecture that he recommended the establishment of a historic district. The mayor of Sycamore then appointed a citizens' committee to assist the state with the work involved in listing the district. The residential areas within the district achieved their maturity before 1900, though Sycamore has grown considerably from the 3,330 or so that lived there from about 1900 until the 1970s most of the historic district remains intact as it was organized in 1978. Boundaries The Historic District is bounded by Somonauk Street on the west and Main Street on the east, a stretch of two blocks. On the north end the district is bounded by Page Street and extends to the end of South Main street. Main and Somonauk are both north/south roads while Page is an east/west street. The district also extends along State Street (Illinois Route 64) to the west until the 300 block. Somonauk Street is included through its 900 block. In