This layer displays Cincinnati Historic Districts and Local Landmarks. These areas help to ensure that any changes do not adversely affect the historic architectural or aesthetic integrity of the Historic District or Historic Asset. Cincinnati Historic Districts layer displays the 15 separate historic districts in the city of Cincinnati, listed in the National Register. These districts range in size from a grouping of buildings of a total area of 1.76 acres to larger areas of 46.24 acres. Further information about the historic districts are to obtained y contacting the City of Cincinnati Historic Conservation Office, the Ohio Historic Preservation Office. Als, the following website gives further information about historic sites in all states and cities in the US http://www.nationalregisterofhistoricplaces.com.